├── .gitignore
├── README.md
├── alarm-clock
    ├── AlarmTone.cpp
    ├── AlarmTone.h
    ├── Button.cpp
    ├── Button.h
    ├── Clock.cpp
    ├── Clock.h
    ├── config.h
    ├── lesson.json
    ├── lesson.md
    ├── sketch.ino
    └── thumbnail.png
├── blink-without-delay-3-leds
    ├── lesson.json
    ├── lesson.md
    ├── sketch.ino
    └── thumbnail.png
├── blink
    ├── lesson.json
    ├── lesson.md
    ├── sketch.ino
    └── thumbnail.png
├── calculator
    ├── lesson.json
    ├── lesson.md
    ├── sketch.ino
    └── thumbnail.png
├── charlieplexing
    ├── lesson.json
    ├── lesson.md
    ├── sketch.ino
    └── thumbnail.png
├── dice-roller
    ├── lesson.json
    ├── lesson.md
    ├── sketch.ino
    └── thumbnail.png
├── eeprom
    ├── lesson.json
    ├── lesson.md
    └── sketch.ino
├── electronic-safe
    ├── SafeState.cpp
    ├── SafeState.h
    ├── icons.cpp
    ├── icons.h
    ├── lesson.json
    ├── lesson.md
    ├── sketch.ino
    └── thumbnail.png
├── fastled
    ├── lesson.json
    ├── lesson.md
    ├── sketch.ino
    └── thumbnail.png
├── happy-birthday
    ├── gift.h
    ├── lesson.json
    ├── lesson.md
    ├── pitches.h
    └── sketch.ino
├── i2c-scanner
    ├── lesson.json
    ├── lesson.md
    ├── sketch.ino
    └── thumbnail.png
├── keypad
    ├── lesson.json
    ├── lesson.md
    ├── sketch.ino
    └── thumbnail.png
├── lcd1602-i2c
    ├── cover.svg
    ├── lesson.json
    ├── lesson.md
    ├── sketch.ino
    └── thumbnail.png
├── lcd1602
    ├── lesson.json
    ├── lesson.md
    └── sketch.ino
├── neopixel-matrix
    ├── lesson.json
    ├── lesson.md
    ├── sketch.ino
    └── thumbnail.png
├── neopixel-strip
    ├── lesson.json
    ├── lesson.md
    ├── sketch.ino
    └── thumbnail.png
├── potentiometer
    ├── lesson.json
    ├── lesson.md
    ├── sketch.ino
    └── thumbnail.png
├── rotary-dialer
    ├── lesson.json
    ├── lesson.md
    ├── sketch.ino
    └── thumbnail.png
├── serial
    ├── lesson.json
    ├── lesson.md
    ├── serial.svg
    ├── sketch.ino
    └── thumbnail.png
├── servo
    ├── lesson.json
    ├── lesson.md
    ├── sketch.ino
    └── thumbnail.png
├── seven-segment-clock
    ├── lesson.json
    ├── lesson.md
    ├── sketch.ino
    └── thumbnail.png
├── simon-game
    ├── lesson.json
    ├── lesson.md
    ├── pitches.h
    ├── sketch.ino
    └── thumbnail.png
├── spaceship-game
    ├── lesson.json
    ├── lesson.md
    ├── sketch.ino
    └── thumbnail.png
├── ssd1306
    ├── lesson.json
    ├── lesson.md
    ├── sketch.ino
    └── thumbnail.png
├── tamaguino
    ├── lesson.json
    ├── lesson.md
    └── sketch.ino
├── task-scheduler
    ├── lesson.json
    ├── lesson.md
    ├── sketch.ino
    └── task-scheduler.svg
├── traffic-light
    ├── lesson.json
    ├── lesson.md
    ├── sketch.ino
    └── thumbnail.png
└── wokwi.json


/.gitignore:
--------------------------------------------------------------------------------
1 | .history
2 | .idea
3 | 


--------------------------------------------------------------------------------
/README.md:
--------------------------------------------------------------------------------
 1 | # Deprecation notice
 2 | 
 3 | This repository is deprecated, as it is now possible to [create projects directly on Wokwi.com](https://wokwi.com/arduino/new).
 4 | 
 5 | # Wokwi Playground Repository
 6 | 
 7 | This repository hosts the code playgrounds on [wokwi.com](https://wokwi.com), e.g.:
 8 | 
 9 | * [Blink](https://wokwi.com/playground/blink?utm_source=github&utm_medium=social&utm_campaign=wokwi-playgrounds)
10 | * [Blink (without delay)](https://wokwi.com/playground/blink-without-delay-3-leds?utm_source=github&utm_medium=social&utm_campaign=wokwi-playgrounds)
11 | * [Dice Roller](https://wokwi.com/playground/dice-roller?utm_source=github&utm_medium=social&utm_campaign=wokwi-playgrounds)
12 | * [LCD1602 I2C](https://wokwi.com/playground/lcd1602-i2c?utm_source=github&utm_medium=social&utm_campaign=wokwi-playgrounds)
13 | * [NeoPixel strip](https://wokwi.com/playground/neopixel-strip?utm_source=github&utm_medium=social&utm_campaign=wokwi-playgrounds)
14 | * [NeoPixel Matrix](https://wokwi.com/playground/neopixel-matrix?utm_source=github&utm_medium=social&utm_campaign=wokwi-playgrounds)
15 | * [Serial Playground](https://wokwi.com/playground/serial?utm_source=github&utm_medium=social&utm_campaign=wokwi-playgrounds)
16 | * [TaskScheduler](https://wokwi.com/playground/task-scheduler?utm_source=github&utm_medium=social&utm_campaign=wokwi-playgrounds)
17 | 
18 | ## Directory structure
19 | 
20 | Each subdirectory is a different playground, and contains the following files:
21 | 
22 | * `lesson.md` - A markdown file with text explaining about the background and HTML code that defines the hardware. A full list of supported hardware components can be found in the [Wokwi Elements Storybook page](https://elements.wokwi.com), and new components can be contributed [through github](https://github.com/wokwi/wokwi-elements).
23 | * `sketch.ino` - The arduino code for the playground
24 | * `lesson.json` - File that describes the lesson. You can add your name there, e.g.: `{"author": "Ariella Eliassaf"}`. This file must be present for the lesson to be recognized by Wokwi.
25 | 
26 | ## Live editing
27 | 
28 | If you wish to tinker with the markdown / hardware of any of the playgrounds, you can do so by going to
29 | the live playground on wokwi.com and adding `?beta-editor=yeah` at the end of the playground URL. For instance:
30 | 
31 | [https://wokwi.com/playground/blink?beta-editor=yeah](https://wokwi.com/playground/blink?beta-editor=yeah&utm_source=github&utm_medium=social&utm_campaign=wokwi-playgrounds)
32 | 
33 | This will open the [blink](blink/lesson.md) playground in live editing mode.
34 | 
35 | # License
36 | 
37 | The content of this repo is released under the [CC-BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/) license.
38 | 


--------------------------------------------------------------------------------
/alarm-clock/AlarmTone.cpp:
--------------------------------------------------------------------------------
 1 | #include <Arduino.h>
 2 | #include "AlarmTone.h"
 3 | 
 4 | #define TONE_TIME 500 /* ms */
 5 | #define TONE_SPACING 100 /* ms */
 6 | 
 7 | static const uint16_t TONES[] = {
 8 |   500,
 9 |   800,
10 | };
11 | const uint16_t NUM_TONES = sizeof(TONES) / sizeof(TONES[0]);
12 | 
13 | AlarmTone::AlarmTone()
14 | : _playing(false)
15 | , _tone_index(0)
16 | , _last_tone_time(0) {
17 | }
18 | 
19 | void AlarmTone::begin(uint8_t pin) {
20 |   _pin = pin;
21 |   pinMode(_pin, OUTPUT);
22 | }
23 | 
24 | void AlarmTone::play() {
25 |   if (!_playing || _last_tone_time + TONE_TIME + TONE_SPACING < millis()) {
26 |     tone(_pin, TONES[_tone_index], TONE_TIME);
27 |     _tone_index = (_tone_index + 1) % NUM_TONES;
28 |     _last_tone_time = millis();
29 |   }
30 |   _playing = true;
31 | }
32 | 
33 | void AlarmTone::stop() {
34 |   noTone(_pin);
35 |   _tone_index = 0;
36 |   _playing = false;
37 | }
38 | 


--------------------------------------------------------------------------------
/alarm-clock/AlarmTone.h:
--------------------------------------------------------------------------------
 1 | #ifndef __ALARM_TONE_H__
 2 | #define __ALARM_TONE_H__
 3 | 
 4 | class AlarmTone {
 5 |   public:
 6 |     AlarmTone();
 7 |     void begin(uint8_t pin);
 8 |     void play();
 9 |     void stop();
10 | 
11 |   private:
12 |     uint8_t _pin;
13 |     bool _playing;
14 |     uint8_t _tone_index;
15 |     unsigned long _last_tone_time;
16 | };
17 | 
18 | #endif /* __ALARM_TONE_H */
19 | 


--------------------------------------------------------------------------------
/alarm-clock/Button.cpp:
--------------------------------------------------------------------------------
  1 | /*
  2 | 	Button - a small library for Arduino to handle button debouncing
  3 | 
  4 | 	MIT licensed.
  5 | */
  6 | 
  7 | #include "Button.h"
  8 | #include <Arduino.h>
  9 | 
 10 | Button::Button(uint8_t pin, uint16_t debounce_ms)
 11 | :  _pin(pin)
 12 | ,  _delay(debounce_ms)
 13 | ,  _state(HIGH)
 14 | ,  _ignore_until(0)
 15 | ,  _has_changed(false)
 16 | ,  _reported_repeats(0)
 17 | ,  _repeat_delay_ms(-1)
 18 | ,  _repeat_ms(-1)
 19 | {
 20 | }
 21 | 
 22 | void Button::begin()
 23 | {
 24 | 	pinMode(_pin, INPUT_PULLUP);
 25 | }
 26 | 
 27 | //
 28 | // public methods
 29 | //
 30 | 
 31 | bool Button::read()
 32 | {
 33 | 	// ignore pin changes until after this delay time
 34 | 	if (_ignore_until > millis())
 35 | 	{
 36 | 		// ignore any changes during this period
 37 | 	}
 38 | 
 39 | 	// pin has changed
 40 | 	else if (digitalRead(_pin) != _state)
 41 | 	{
 42 | 		_state = !_state;
 43 | 
 44 | 		if (_state == RELEASED)
 45 | 		{
 46 | 			_reported_repeats = repeats_since_press();
 47 | 		}
 48 | 
 49 | 		else
 50 | 		{
 51 | 			_reported_repeats = 0;
 52 | 		}
 53 | 
 54 | 		_ignore_until = millis() + _delay;
 55 | 		_has_changed = true;
 56 | 	}
 57 | 
 58 | 	return _state;
 59 | }
 60 | 
 61 | // has the button been toggled from on -> off, or vice versa
 62 | bool Button::toggled()
 63 | {
 64 | 	read();
 65 | 	return has_changed();
 66 | }
 67 | 
 68 | // mostly internal, tells you if a button has changed after calling the read() function
 69 | bool Button::has_changed()
 70 | {
 71 | 	if (_has_changed)
 72 | 	{
 73 | 		_has_changed = false;
 74 | 		return true;
 75 | 	}
 76 | 	return false;
 77 | }
 78 | 
 79 | // how many repeated press events occured since the button was pressed
 80 | uint16_t Button::repeat_count()
 81 | {
 82 | 	return _state == PRESSED ? repeats_since_press() : _reported_repeats;
 83 | }
 84 | 
 85 | // has the button gone from off -> on or pressed repeatedly
 86 | bool Button::pressed()
 87 | {
 88 | 	if (read() == PRESSED)
 89 | 	{
 90 | 		uint16_t old_repeats = _reported_repeats;
 91 | 		_reported_repeats = repeats_since_press();
 92 | 		return (has_changed() || old_repeats != _reported_repeats);
 93 | 	}
 94 | 	else
 95 | 	{
 96 | 		return false;
 97 | 	}
 98 | }
 99 | 
100 | // has the button gone from on -> off
101 | bool Button::released()
102 | {
103 | 	return (read() == RELEASED && has_changed());
104 | }
105 | 
106 | void Button::set_repeat(int16_t delay_ms, int16_t repeat_ms)
107 | {
108 | 	_repeat_delay_ms = delay_ms > _delay ? delay_ms - _delay : 0;
109 | 	_repeat_ms = repeat_ms;
110 | }
111 | 
112 | uint16_t Button::repeats_since_press()
113 | {
114 |  	if (_repeat_delay_ms == -1 || millis() < _ignore_until + _repeat_delay_ms)
115 | 	{
116 | 		return 0;
117 | 	}
118 | 
119 | 	if (_repeat_ms <= 0)
120 | 	{
121 | 		return 1;
122 | 	}
123 | 
124 | 	uint32_t press_time = millis() - _ignore_until;
125 | 	return 1 + (press_time - _repeat_delay_ms) / _repeat_ms;
126 | }
127 | 


--------------------------------------------------------------------------------
/alarm-clock/Button.h:
--------------------------------------------------------------------------------
 1 | /*
 2 | 	Button - a small library for Arduino to handle button debouncing
 3 | 
 4 | 	MIT licensed.
 5 | */
 6 | 
 7 | #ifndef Button_h
 8 | #define Button_h
 9 | #include "Arduino.h"
10 | 
11 | class Button
12 | {
13 | 	public:
14 | 		Button(uint8_t pin, uint16_t debounce_ms = 100);
15 | 		void begin();
16 | 		bool read();
17 | 		bool toggled();
18 | 		bool pressed();
19 | 		bool released();
20 | 		bool has_changed();
21 | 		uint16_t repeat_count();
22 | 		void set_repeat(int16_t delay_ms, int16_t repeat_ms);
23 | 
24 | 		const static bool PRESSED = LOW;
25 | 		const static bool RELEASED = HIGH;
26 | 
27 | 	private:
28 | 		uint16_t repeats_since_press();
29 | 
30 | 		uint8_t  _pin;
31 | 		uint16_t _delay;
32 | 		bool     _state;
33 | 		uint32_t _ignore_until;
34 | 		bool     _has_changed;
35 | 		uint16_t _reported_repeats;
36 | 		int16_t  _repeat_delay_ms;
37 | 		int16_t  _repeat_ms;
38 | };
39 | 
40 | #endif
41 | 


--------------------------------------------------------------------------------
/alarm-clock/Clock.cpp:
--------------------------------------------------------------------------------
  1 | #include <Arduino.h>
  2 | #include "Clock.h"
  3 | 
  4 | #define MINUTE 60 * 1000L /* ms */
  5 | #define TIMESPAN_DAY TimeSpan(1, 0, 0, 0)
  6 | 
  7 | #define NVRAM_ADDR_ALARM_ENABLED 0
  8 | #define NVRAM_ADDR_ALARM_HOUR    1
  9 | #define NVRAM_ADDR_ALARM_MINUTE  2
 10 | 
 11 | 
 12 | Clock::Clock()
 13 |   : _alarm_state(ALARM_OFF)
 14 |   , _alarm_snooze_time(0)
 15 |   , _alarm_hour(DEFAULT_ALARM_HOUR)
 16 |   , _alarm_minute(0) {
 17 | }
 18 | 
 19 | void Clock::begin() {
 20 | # if USE_RTC
 21 |   if (!_rtc.begin()) {
 22 |     Serial.println("Couldn't find RTC");
 23 |     abort();
 24 |   }
 25 |   _alarm_state = _rtc.readnvram(NVRAM_ADDR_ALARM_ENABLED) ? ALARM_OFF : ALARM_DISABLED;
 26 |   _alarm_hour = _rtc.readnvram(NVRAM_ADDR_ALARM_HOUR) % 24;
 27 |   _alarm_minute = _rtc.readnvram(NVRAM_ADDR_ALARM_MINUTE) % 60;
 28 | # else /* USE_RTC */
 29 |   DateTime zeroTime;
 30 |   _rtc.begin(zeroTime);
 31 | # endif
 32 | }
 33 | 
 34 | /***** Clock management *****/
 35 | 
 36 | DateTime Clock::now() {
 37 |   return _rtc.now();
 38 | }
 39 | 
 40 | void Clock::incrementMinute() {
 41 |   DateTime now = _rtc.now();
 42 |   DateTime newTime = DateTime(now.year(), now.month(), now.day(), now.hour(),
 43 |                               (now.minute() + 1) % 60);
 44 |   _rtc.adjust(newTime);
 45 | }
 46 | 
 47 | void Clock::incrementHour() {
 48 |   DateTime now = _rtc.now();
 49 |   DateTime newTime = DateTime(now.year(), now.month(), now.day(),
 50 |                               (now.hour() + 1) % 24, now.minute());
 51 |   _rtc.adjust(newTime);
 52 | }
 53 | 
 54 | /***** Alarm management *****/
 55 | bool Clock::_isAlarmDueTime() {
 56 |   auto currentTime = now();
 57 |   auto alarm = alarmTime();
 58 |   return ((currentTime.hour() == alarm.hour())
 59 |           && (currentTime.minute() == alarm.minute()));
 60 | }
 61 | 
 62 | bool Clock::alarmEnabled() {
 63 |   return _alarm_state != ALARM_DISABLED;
 64 | }
 65 | 
 66 | bool Clock::alarmActive() {
 67 |   switch (_alarm_state) {
 68 |     case ALARM_DISABLED:
 69 |       return false;
 70 | 
 71 |     case ALARM_OFF:
 72 |       if (_isAlarmDueTime()) {
 73 |         _alarm_state = ALARM_ACTIVE;
 74 |         return true;
 75 |       }
 76 |       return false;
 77 | 
 78 |     case ALARM_ACTIVE:
 79 |       return true;
 80 | 
 81 |     case ALARM_SNOOZED:
 82 |       if (millis() >= _alarm_snooze_time) {
 83 |         _alarm_state = ALARM_ACTIVE;
 84 |         return true;
 85 |       }
 86 |       return false;
 87 | 
 88 |     case ALARM_STOPPED:
 89 |       if (!_isAlarmDueTime()) {
 90 |         _alarm_state = ALARM_OFF;
 91 |       }
 92 |       return false;
 93 | 
 94 |     default:
 95 |       return false;
 96 |   }
 97 | }
 98 | 
 99 | 
100 | void Clock::toggleAlarm() {
101 |   bool enabled = !alarmEnabled();
102 |   _alarm_state = enabled ? ALARM_OFF : ALARM_DISABLED;
103 |   _rtc.writenvram(NVRAM_ADDR_ALARM_ENABLED, enabled);
104 | }
105 | 
106 | DateTime Clock::alarmTime() {
107 |   DateTime now = _rtc.now();
108 |   DateTime alarm = DateTime(now.year(), now.month(), now.day(), _alarm_hour, _alarm_minute);
109 |   return alarm >= now ? alarm : alarm + TIMESPAN_DAY;
110 | }
111 | 
112 | void Clock::snooze() {
113 |   _alarm_state = ALARM_SNOOZED;
114 |   _alarm_snooze_time = millis() + SNOOZE_TIME * MINUTE;
115 | }
116 | 
117 | void Clock::stopAlarm() {
118 |   _alarm_state = ALARM_STOPPED;
119 | }
120 | 
121 | void Clock::incrementAlarmHour() {
122 |   _alarm_hour = (_alarm_hour + 1) % 24;
123 |   _alarm_state = ALARM_OFF;
124 |   _rtc.writenvram(NVRAM_ADDR_ALARM_HOUR, _alarm_hour);
125 | }
126 | 
127 | void Clock::incrementAlarmMinute() {
128 |   _alarm_minute = (_alarm_minute + 1) % 60;
129 |   _alarm_state = ALARM_OFF;
130 |   _rtc.writenvram(NVRAM_ADDR_ALARM_MINUTE, _alarm_minute);
131 | }
132 | 


--------------------------------------------------------------------------------
/alarm-clock/Clock.h:
--------------------------------------------------------------------------------
 1 | #ifndef __CLOCK_H__
 2 | #define __CLOCK_H__
 3 | 
 4 | #include <RTClib.h>
 5 | #include "config.h"
 6 | 
 7 | enum AlarmState {
 8 |   ALARM_DISABLED,
 9 |   ALARM_OFF,
10 |   ALARM_ACTIVE,
11 |   ALARM_SNOOZED,
12 |   ALARM_STOPPED,
13 | };
14 | 
15 | class Clock {
16 | public:
17 |   Clock();
18 |   void begin();
19 | 
20 |   /* Clock management */
21 |   DateTime now();
22 |   void incrementMinute();
23 |   void incrementHour();
24 | 
25 |   /* Alarm Management */
26 |   bool alarmEnabled();
27 |   DateTime alarmTime();
28 |   bool alarmActive();
29 |   void toggleAlarm();
30 |   void snooze();
31 |   void stopAlarm();
32 |   void incrementAlarmHour();
33 |   void incrementAlarmMinute();
34 | 
35 | protected:
36 |   bool _isAlarmDueTime();
37 | 
38 |   #if USE_RTC
39 |     RTC_DS1307 _rtc;
40 |   #else /* USE_RTC */
41 |     RTC_Millis _rtc;
42 |   #endif /* USE_RTC */
43 | 
44 |   byte _alarm_hour;
45 |   byte _alarm_minute;
46 |   AlarmState _alarm_state;
47 |   unsigned long _alarm_snooze_time;
48 | };
49 | 
50 | #endif /* __CLOCK_H__ */
51 | 


--------------------------------------------------------------------------------
/alarm-clock/config.h:
--------------------------------------------------------------------------------
 1 | /**
 2 |    Arduino Digital Alarm Clock
 3 | 
 4 |    Copyright (C) 2020, Uri Shaked.
 5 |    Released under the MIT License.
 6 | 
 7 |    Clock Configuration File.
 8 | */
 9 | 
10 | #ifndef __CONFIG_H__
11 | #define __CONFIG_H__
12 | 
13 | /**
14 |    Change to 0 for running without an external RTC (Real time clock)
15 | */
16 | #define USE_RTC 1
17 | 
18 | /**
19 |    Your 7-Segment display type: COMMON_ANODE or COMMON_CATHODE
20 | */
21 | #define DISPLAY_TYPE COMMON_ANODE
22 | 
23 | /**
24 |    For how long should we show the alarm status (on/off)?
25 | */
26 | const int ALARM_STATUS_DISPLAY_TIME = 1000; /* ms */
27 | 
28 | /**
29 |    For how long should we show the alarm hour?
30 | */
31 | const int ALARM_HOUR_DISPLAY_TIME = 2500; /* ms */
32 | 
33 | /**
34 |    For how long should we display the snooze screen?
35 | */
36 | const int SNOOZE_DISPLAY_TIME = 500; /* ms */
37 | 
38 | /**
39 |    How many minutes to snooze the alarm for?
40 | */
41 | const int SNOOZE_TIME = 9; /* minutes */
42 | 
43 | /**
44 |    The default Alarm hour (for non-RTC mode)
45 | */
46 | const int DEFAULT_ALARM_HOUR = 9;
47 | 
48 | #endif /* __CONFIG_H__ */
49 | 


--------------------------------------------------------------------------------
/alarm-clock/lesson.json:
--------------------------------------------------------------------------------
 1 | {
 2 |   "title": "Alarm Clock",
 3 |   "thumbnail": "thumbnail.png",
 4 |   "files": [
 5 |     "AlarmTone.cpp",
 6 |     "AlarmTone.h",
 7 |     "Button.cpp",
 8 |     "Button.h",
 9 |     "config.h",
10 |     "Clock.cpp",
11 |     "Clock.h"
12 |   ]
13 | }
14 | 


--------------------------------------------------------------------------------
/alarm-clock/lesson.md:
--------------------------------------------------------------------------------
 1 | # Arduino Alarm Clock
 2 | 
 3 | Digital Alarm Clock with RTC and Snooze function. Click on <strong>Run Code</strong> to start the simulation.
 4 | 
 5 | <div style="display:flex">
 6 |   <wokwi-7segment color="red" digits="4" colon="true"
 7 |      connections="anode:2,3,4,5:6,7,8,9,10,11,12,0" colonPin="13"></wokwi-7segment>
 8 |   <wokwi-buzzer pin="A3" style="margin-left: 16px;"></wokwi-buzzer>
 9 | </div>
10 | 
11 | <div style="display: flex; margin-top: 16px;">
12 |   <div style="display: flex; flex-direction: column; align-items: center">
13 |     <wokwi-pushbutton pin="A0" color="green"></wokwi-pushbutton>
14 |     <small>Hour</small>
15 |   </div>
16 |   <div style="display: flex; flex-direction: column; align-items: center">
17 |     <wokwi-pushbutton pin="A1" color="green"  style="vertical-align:middle"></wokwi-pushbutton>
18 |     <small>Minute</small>
19 |   </div>
20 |   <div style="display: flex; flex-direction: column; align-items: center">
21 |     <wokwi-pushbutton pin="A2" color="red"  style="vertical-align:middle"></wokwi-pushbutton>
22 |     <small>Alarm</small>
23 |   </div>
24 | </div>
25 | 
26 | <wokwi-ds1307></wokwi-ds1307>
27 | 


--------------------------------------------------------------------------------
/alarm-clock/sketch.ino:
--------------------------------------------------------------------------------
  1 | /**
  2 |    Arduino Digital Alarm Clock
  3 | 
  4 |    Copyright (C) 2020, Uri Shaked.
  5 |    Released under the MIT License.
  6 | 
  7 | */
  8 | 
  9 | #include <SevSeg.h>
 10 | #include "Button.h"
 11 | #include "AlarmTone.h"
 12 | #include "Clock.h"
 13 | #include "config.h"
 14 | 
 15 | const int COLON_PIN = 13;
 16 | const int SPEAKER_PIN = A3;
 17 | 
 18 | Button hourButton(A0);
 19 | Button minuteButton(A1);
 20 | Button alarmButton(A2);
 21 | 
 22 | AlarmTone alarmTone;
 23 | Clock clock;
 24 | SevSeg sevseg;
 25 | 
 26 | enum DisplayState {
 27 |   DisplayClock,
 28 |   DisplayAlarmStatus,
 29 |   DisplayAlarmTime,
 30 |   DisplayAlarmActive,
 31 |   DisplaySnooze,
 32 | };
 33 | 
 34 | DisplayState displayState = DisplayClock;
 35 | long lastStateChange = 0;
 36 | 
 37 | void changeDisplayState(DisplayState newValue) {
 38 |   displayState = newValue;
 39 |   lastStateChange = millis();
 40 | }
 41 | 
 42 | long millisSinceStateChange() {
 43 |   return millis() - lastStateChange;
 44 | }
 45 | 
 46 | void setColon(bool value) {
 47 |   digitalWrite(COLON_PIN, value ? LOW : HIGH);
 48 | }
 49 | 
 50 | void displayTime() {
 51 |   DateTime now = clock.now();
 52 |   bool blinkState = now.second() % 2 == 0;
 53 |   sevseg.setNumber(now.hour() * 100 + now.minute());
 54 |   setColon(blinkState);
 55 | }
 56 | 
 57 | void clockState() {
 58 |   displayTime();
 59 | 
 60 |   if (alarmButton.read() == Button::RELEASED && clock.alarmActive()) {
 61 |     // Read alarmButton has_changed() to clear its state
 62 |     alarmButton.has_changed();
 63 |     changeDisplayState(DisplayAlarmActive);
 64 |     return;
 65 |   }
 66 | 
 67 |   if (hourButton.pressed()) {
 68 |     clock.incrementHour();
 69 |   }
 70 |   if (minuteButton.pressed()) {
 71 |     clock.incrementMinute();
 72 |   }
 73 |   if (alarmButton.pressed()) {
 74 |     clock.toggleAlarm();
 75 |     changeDisplayState(DisplayAlarmStatus);
 76 |   }
 77 | }
 78 | 
 79 | void alarmStatusState() {
 80 |   setColon(false);
 81 |   sevseg.setChars(clock.alarmEnabled() ? " on" : " off");
 82 |   if (millisSinceStateChange() > ALARM_STATUS_DISPLAY_TIME) {
 83 |     changeDisplayState(clock.alarmEnabled() ? DisplayAlarmTime : DisplayClock);
 84 |     return;
 85 |   }
 86 | }
 87 | 
 88 | void alarmTimeState() {
 89 |   DateTime alarm = clock.alarmTime();
 90 |   sevseg.setNumber(alarm.hour() * 100 + alarm.minute(), -1);
 91 | 
 92 |   if (millisSinceStateChange() > ALARM_HOUR_DISPLAY_TIME || alarmButton.pressed()) {
 93 |     changeDisplayState(DisplayClock);
 94 |     return;
 95 |   }
 96 | 
 97 |   if (hourButton.pressed()) {
 98 |     clock.incrementAlarmHour();
 99 |     lastStateChange = millis();
100 |   }
101 |   if (minuteButton.pressed()) {
102 |     clock.incrementAlarmMinute();
103 |     lastStateChange = millis();
104 |   }
105 |   if (alarmButton.pressed()) {
106 |     changeDisplayState(DisplayClock);
107 |   }
108 | }
109 | 
110 | void alarmState() {
111 |   displayTime();
112 | 
113 |   if (alarmButton.read() == Button::RELEASED) {
114 |     alarmTone.play();
115 |   }
116 |   if (alarmButton.pressed()) {
117 |     alarmTone.stop();
118 |   }
119 |   if (alarmButton.released()) {
120 |     alarmTone.stop();
121 |     bool longPress = alarmButton.repeat_count() > 0;
122 |     if (longPress) {
123 |       clock.stopAlarm();
124 |       changeDisplayState(DisplayClock);
125 |     } else {
126 |       clock.snooze();
127 |       changeDisplayState(DisplaySnooze);
128 |     }
129 |   }
130 | }
131 | 
132 | void snoozeState() {
133 |   sevseg.setChars("****");
134 |   if (millisSinceStateChange() > SNOOZE_DISPLAY_TIME) {
135 |     changeDisplayState(DisplayClock);
136 |     return;
137 |   }
138 | }
139 | 
140 | void setup() {
141 |   Serial.begin(115200);
142 | 
143 |   clock.begin();
144 | 
145 |   hourButton.begin();
146 |   hourButton.set_repeat(500, 200);
147 | 
148 |   minuteButton.begin();
149 |   minuteButton.set_repeat(500, 200);
150 | 
151 |   alarmButton.begin();
152 |   alarmButton.set_repeat(1000, -1);
153 | 
154 |   alarmTone.begin(SPEAKER_PIN);
155 | 
156 |   pinMode(COLON_PIN, OUTPUT);
157 | 
158 |   byte digits = 4;
159 |   byte digitPins[] = {2, 3, 4, 5};
160 |   byte segmentPins[] = {6, 7, 8, 9, 10, 11, 12};
161 |   bool resistorsOnSegments = false;
162 |   bool updateWithDelays = false;
163 |   bool leadingZeros = true;
164 |   bool disableDecPoint = true;
165 |   sevseg.begin(DISPLAY_TYPE, digits, digitPins, segmentPins, resistorsOnSegments,
166 |                updateWithDelays, leadingZeros, disableDecPoint);
167 |   sevseg.setBrightness(90);
168 | }
169 | 
170 | void loop() {
171 |   sevseg.refreshDisplay();
172 | 
173 |   switch (displayState) {
174 |     case DisplayClock:
175 |       clockState();
176 |       break;
177 | 
178 |     case DisplayAlarmStatus:
179 |       alarmStatusState();
180 |       break;
181 | 
182 |     case DisplayAlarmTime:
183 |       alarmTimeState();
184 |       break;
185 | 
186 |     case DisplayAlarmActive:
187 |       alarmState();
188 |       break;
189 | 
190 |     case DisplaySnooze:
191 |       snoozeState();
192 |       break;
193 |   }
194 | }
195 | 


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/blink-without-delay-3-leds/lesson.json:
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1 | {
2 |   "title": "Blink Without Delay",
3 |   "thumbnail": "thumbnail.png",
4 |   "coverImage": "https://developwithdan.com/wp-content/uploads/2020/02/Blink-Without-Delayt-1200x700.jpg"
5 | }
6 | 


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/blink-without-delay-3-leds/lesson.md:
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 1 | # Understanding Blink without Delay Demo Code
 2 | 
 3 | This is the sample code from Dan Hoover's article <a href="https://developwithdan.com/understanding-blink-without-delay/" target="_blank">Understanding Blink Without Delay</a>
 4 | 
 5 | It shows how to use the `millis()` function to blink 3 LEDs, each with a different interval:
 6 | 
 7 | <wokwi-led color="red" label="2"></wokwi-led>
 8 | <wokwi-led color="blue" label="3"></wokwi-led>
 9 | <wokwi-led color="green" label="4"></wokwi-led>
10 | 
11 | Click on <strong>"Run Code"</strong> to see it in action. Can you achieve the same effect with
12 | less code and still without using `delay()` ?
13 | 
14 | For more information, check out Dan's YouTube tutorial:
15 | 
16 | <iframe width="560" height="315" src="https://www.youtube.com/embed/v5SpPXMmHJE" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
17 | 


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/blink-without-delay-3-leds/sketch.ino:
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 1 | // Code from https://github.com/mudmin/AnotherMaker/tree/master/blink-without-delay
 2 | 
 3 | int red = 2;
 4 | int intervalRed = 1000; //how long to delay in millis
 5 | unsigned long previousRed = 0;
 6 | int redState = LOW;
 7 | 
 8 | int blue = 3;
 9 | int intervalBlue = 2500; //how long to delay in millis
10 | unsigned long previousBlue = 0;
11 | int blueState = LOW;
12 | 
13 | int green = 4;
14 | int intervalGreen = 5000; //how long to delay in millis
15 | unsigned long previousGreen = 0;
16 | int greenState = LOW;
17 | 
18 | void setup() {
19 |   Serial.begin(9600);
20 |   pinMode(red, OUTPUT);
21 |   pinMode(blue, OUTPUT);
22 |   pinMode(green, OUTPUT);
23 | }
24 | 
25 | void checkRed() {
26 |   unsigned long currentMillis = millis();
27 | 
28 |   if (currentMillis - previousRed >= intervalRed) {
29 |     //save this reading!
30 |     previousRed = currentMillis;
31 | 
32 |     //figure out if you should turn the LED on or off
33 |     if (redState == LOW) {
34 |       redState = HIGH;
35 |     } else {
36 |       redState = LOW;
37 |     }
38 |     digitalWrite(red, redState);
39 |   }
40 | }
41 | 
42 | void checkGreen() {
43 |   unsigned long currentMillis = millis();
44 | 
45 |   if (currentMillis - previousGreen >= intervalGreen) {
46 |     //save this reading!
47 |     previousGreen = currentMillis;
48 | 
49 |     //figure out if you should turn the LED on or off
50 |     if (greenState == LOW) {
51 |       greenState = HIGH;
52 |     } else {
53 |       greenState = LOW;
54 |     }
55 |     digitalWrite(green, greenState);
56 |   }
57 | }
58 | 
59 | void checkBlue() {
60 |   unsigned long currentMillis = millis();
61 | 
62 |   if (currentMillis - previousBlue >= intervalBlue) {
63 |     //save this reading!
64 |     previousBlue = currentMillis;
65 | 
66 |     //figure out if you should turn the LED on or off
67 |     if (blueState == LOW) {
68 |       blueState = HIGH;
69 |     } else {
70 |       blueState = LOW;
71 |     }
72 |     digitalWrite(blue, blueState);
73 |   }
74 | }
75 | 
76 | 
77 | void loop() {
78 |   checkRed();
79 |   checkGreen();
80 |   checkBlue();
81 | }
82 | 


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/blink-without-delay-3-leds/thumbnail.png:
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https://raw.githubusercontent.com/wokwi/wokwi-playgrounds/a4cbf14c128b5dc971ad0a1dc421513075f4e297/blink-without-delay-3-leds/thumbnail.png


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/blink/lesson.json:
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1 | {
2 |   "title": "Blink",
3 |   "thumbnail": "thumbnail.png"
4 | }
5 | 


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/blink/lesson.md:
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 1 | # Arduino Blink
 2 | 
 3 | The "Hello World" Arduino code example: Blinking an LED. 
 4 | 
 5 | The red LED is attached to digital pin 13, represented by `LED_BUILTIN` in the code.
 6 | 
 7 | <wokwi-led color="red" label="13"></wokwi-led>
 8 | 
 9 | Click on <strong>"Run Code"</strong> to see it in action. 
10 | 


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/blink/sketch.ino:
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 1 | // the setup function runs once when you press reset or power the board
 2 | void setup() {
 3 |   // initialize digital pin LED_BUILTIN as an output.
 4 |   pinMode(LED_BUILTIN, OUTPUT);
 5 | }
 6 | 
 7 | // the loop function runs over and over again forever
 8 | void loop() {
 9 |   digitalWrite(LED_BUILTIN, HIGH);   // turn the LED on (HIGH is the voltage level)
10 |   delay(1000);                       // wait for a second
11 |   digitalWrite(LED_BUILTIN, LOW);    // turn the LED off by making the voltage LOW
12 |   delay(1000);                       // wait for a second
13 | }
14 | 


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/blink/thumbnail.png:
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https://raw.githubusercontent.com/wokwi/wokwi-playgrounds/a4cbf14c128b5dc971ad0a1dc421513075f4e297/blink/thumbnail.png


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/calculator/lesson.json:
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1 | {
2 |   "title": "Calculator",
3 |   "thumbnail": "thumbnail.png"
4 | }
5 | 


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/calculator/lesson.md:
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 1 | # Arduino Calculator 🧮
 2 | 
 3 | Project from [Good Arduino Code](https://goodarduinocode.com?utm_source=wokwi&utm_medium=site&utm_campaign=calculator). For more information, check out the [Calculator Project Page](https://goodarduinocode.com/projects/calculator?utm_source=wokwi&utm_medium=site&utm_campaign=calculator).
 4 | 
 5 | Click on <b>Run code</b> to see it in action!
 6 | 
 7 | <div style="display: flex; flex-direction: column; align-items: center">
 8 |   <wokwi-lcd1602 pinList="rs:12 enable:11 d7:7 d6:8 d5:9 d4:10"></wokwi-lcd1602>
 9 |   <wokwi-membrane-keypad rows="5,4,3,2" cols="A3,A2,A1,A0" 
10 |     keys='["1", "2", "3", "+", "4", "5", "6", "-", "7", "8", "9", "*", ".", "0", "=", "/"]'></wokwi-membrane-keypad>
11 | </div>
12 | 


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/calculator/sketch.ino:
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  1 | /**
  2 |    Arduino Calculator
  3 | 
  4 |    Copyright (C) 2020, Uri Shaked.
  5 |    Released under the MIT License.
  6 | */
  7 | 
  8 | #include <LiquidCrystal.h>
  9 | #include <Keypad.h>
 10 | #include <Servo.h>
 11 | 
 12 | /* Display */
 13 | LiquidCrystal lcd(12, 11, 10, 9, 8, 7);
 14 | 
 15 | /* Keypad setup */
 16 | const byte KEYPAD_ROWS = 4;
 17 | const byte KEYPAD_COLS = 4;
 18 | byte rowPins[KEYPAD_ROWS] = {5, 4, 3, 2};
 19 | byte colPins[KEYPAD_COLS] = {A3, A2, A1, A0};
 20 | char keys[KEYPAD_ROWS][KEYPAD_COLS] = {
 21 |   {'1', '2', '3', '+'},
 22 |   {'4', '5', '6', '-'},
 23 |   {'7', '8', '9', '*'},
 24 |   {'.', '0', '=', '/'}
 25 | };
 26 | 
 27 | Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, KEYPAD_ROWS, KEYPAD_COLS);
 28 | 
 29 | uint64_t value = 0;
 30 | 
 31 | void showSpalshScreen() {
 32 |   lcd.print("GoodArduinoCode");
 33 |   lcd.setCursor(3, 1);
 34 |   String message = "Calculator";
 35 |   for (byte i = 0; i < message.length(); i++) {
 36 |     lcd.print(message[i]);
 37 |     delay(50);
 38 |   }
 39 |   delay(500);
 40 | }
 41 | 
 42 | void updateCursor() {
 43 |   if (millis() / 250 % 2 == 0 ) {
 44 |     lcd.cursor();
 45 |   } else {
 46 |     lcd.noCursor();
 47 |   }
 48 | }
 49 | 
 50 | void setup() {
 51 |   Serial.begin(115200);
 52 |   lcd.begin(16, 2);
 53 | 
 54 |   showSpalshScreen();
 55 |   lcd.clear();
 56 |   lcd.cursor();
 57 | 
 58 |   lcd.setCursor(1, 0);
 59 | }
 60 | 
 61 | char operation = 0;
 62 | String memory = "";
 63 | String current = "";
 64 | uint64_t currentDecimal;
 65 | bool decimalPoint = false;
 66 | 
 67 | double calculate(char operation, double left, double right) {
 68 |   switch (operation) {
 69 |     case '+': return left + right;
 70 |     case '-': return left - right;
 71 |     case '*': return left * right;
 72 |     case '/': return left / right;
 73 |   }
 74 | }
 75 | 
 76 | void processInput(char key) {
 77 |   if ('-' == key && current == "") {
 78 |     current = "-";
 79 |     lcd.print("-");
 80 |     return;
 81 |   }
 82 | 
 83 |   switch (key) {
 84 |     case '+':
 85 |     case '-':
 86 |     case '*':
 87 |     case '/':
 88 |       if (!operation) {
 89 |         memory = current;
 90 |         current = "";
 91 |       }
 92 |       operation = key;
 93 |       lcd.setCursor(0, 1);
 94 |       lcd.print(key);
 95 |       lcd.setCursor(current.length() + 1, 1);
 96 |       return;
 97 | 
 98 |     case '=':
 99 |       float leftNum = memory.toDouble();
100 |       float rightNum = current.toDouble();
101 |       memory = String(calculate(operation, leftNum, rightNum));
102 |       current = "";
103 |       lcd.clear();
104 |       lcd.setCursor(1, 0);
105 |       lcd.print(memory);
106 |       lcd.setCursor(0, 1);
107 |       lcd.print(operation);
108 |       return;
109 | 
110 |   }
111 | 
112 |   if ('.' == key && current.indexOf('.') >= 0) {
113 |     return;
114 |   }
115 | 
116 |   if ('.' != key && current == "0") {
117 |     current = String(key);
118 |   } else if (key) {
119 |     current += String(key);
120 |   }
121 | 
122 |   lcd.print(key);
123 | }
124 | 
125 | void loop() {
126 |   updateCursor();
127 | 
128 |   char key = keypad.getKey();
129 |   if (key) {
130 |     processInput(key);
131 |   }
132 | }
133 | 


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/calculator/thumbnail.png:
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https://raw.githubusercontent.com/wokwi/wokwi-playgrounds/a4cbf14c128b5dc971ad0a1dc421513075f4e297/calculator/thumbnail.png


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/charlieplexing/lesson.json:
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1 | {
2 |   "title": "Charlieplexing",
3 |   "thumbnail": "thumbnail.png"
4 | }
5 | 


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/charlieplexing/lesson.md:
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  1 | # Charlieplexing Playground
  2 | 
  3 | Charlieplexing is a technique that lets you control a large number of LEDs using just a few 
  4 | Arduino pins. In this example, we're only using pins 2-10 to control 72 LEDs.
  5 | 
  6 | Each LED is connected to a different combination of pins. For instance, the top-left LED's
  7 | negative end (cathode) is connected to Arduino pin 2, and it's positive end (anode) is 
  8 | connected to pin number 3.
  9 | 
 10 | Click on "Run Code" to see it in action!
 11 | 
 12 | <div>
 13 |   <wokwi-led color="white" lightColor="red" label="2 3" cathode="2" anode="3"></wokwi-led>
 14 |   <wokwi-led color="white" lightColor="red" label="2 4" cathode="2" anode="4"></wokwi-led>
 15 |   <wokwi-led color="white" lightColor="red" label="2 5" cathode="2" anode="5"></wokwi-led>
 16 |   <wokwi-led color="white" lightColor="red" label="2 6" cathode="2" anode="6"></wokwi-led>
 17 |   <wokwi-led color="white" lightColor="red" label="2 7" cathode="2" anode="7"></wokwi-led>
 18 |   <wokwi-led color="white" lightColor="red" label="2 8" cathode="2" anode="8"></wokwi-led>
 19 |   <wokwi-led color="white" lightColor="red" label="2 9" cathode="2" anode="9"></wokwi-led>
 20 |   <wokwi-led color="white" lightColor="red" label="2 10" cathode="2" anode="10"></wokwi-led>
 21 | </div>
 22 | <div>
 23 |   <wokwi-led color="white" lightColor="red" label="3 2" cathode="3" anode="2"></wokwi-led>
 24 |   <wokwi-led color="white" lightColor="red" label="3 4" cathode="3" anode="4"></wokwi-led>
 25 |   <wokwi-led color="white" lightColor="red" label="3 5" cathode="3" anode="5"></wokwi-led>
 26 |   <wokwi-led color="white" lightColor="red" label="3 6" cathode="3" anode="6"></wokwi-led>
 27 |   <wokwi-led color="white" lightColor="red" label="3 7" cathode="3" anode="7"></wokwi-led>
 28 |   <wokwi-led color="white" lightColor="red" label="3 8" cathode="3" anode="8"></wokwi-led>
 29 |   <wokwi-led color="white" lightColor="red" label="3 9" cathode="3" anode="9"></wokwi-led>
 30 |   <wokwi-led color="white" lightColor="red" label="3 10" cathode="3" anode="10"></wokwi-led>
 31 | </div>
 32 | <div>
 33 |   <wokwi-led color="white" lightColor="red" label="4 2" cathode="4" anode="2"></wokwi-led>
 34 |   <wokwi-led color="white" lightColor="red" label="4 3" cathode="4" anode="3"></wokwi-led>
 35 |   <wokwi-led color="white" lightColor="red" label="4 5" cathode="4" anode="5"></wokwi-led>
 36 |   <wokwi-led color="white" lightColor="red" label="4 6" cathode="4" anode="6"></wokwi-led>
 37 |   <wokwi-led color="white" lightColor="red" label="4 7" cathode="4" anode="7"></wokwi-led>
 38 |   <wokwi-led color="white" lightColor="red" label="4 8" cathode="4" anode="8"></wokwi-led>
 39 |   <wokwi-led color="white" lightColor="red" label="4 9" cathode="4" anode="9"></wokwi-led>
 40 |   <wokwi-led color="white" lightColor="red" label="4 10" cathode="4" anode="10"></wokwi-led>
 41 | </div>
 42 | <div>
 43 |   <wokwi-led color="white" lightColor="red" label="5 2" cathode="5" anode="2"></wokwi-led>
 44 |   <wokwi-led color="white" lightColor="red" label="5 3" cathode="5" anode="3"></wokwi-led>
 45 |   <wokwi-led color="white" lightColor="red" label="5 4" cathode="5" anode="4"></wokwi-led>
 46 |   <wokwi-led color="white" lightColor="red" label="5 6" cathode="5" anode="6"></wokwi-led>
 47 |   <wokwi-led color="white" lightColor="red" label="5 7" cathode="5" anode="7"></wokwi-led>
 48 |   <wokwi-led color="white" lightColor="red" label="5 8" cathode="5" anode="8"></wokwi-led>
 49 |   <wokwi-led color="white" lightColor="red" label="5 9" cathode="5" anode="9"></wokwi-led>
 50 |   <wokwi-led color="white" lightColor="red" label="5 10" cathode="5" anode="10"></wokwi-led>
 51 | </div>
 52 | <div>
 53 |   <wokwi-led color="white" lightColor="red" label="6 2" cathode="6" anode="2"></wokwi-led>
 54 |   <wokwi-led color="white" lightColor="red" label="6 3" cathode="6" anode="3"></wokwi-led>
 55 |   <wokwi-led color="white" lightColor="red" label="6 4" cathode="6" anode="4"></wokwi-led>
 56 |   <wokwi-led color="white" lightColor="red" label="6 5" cathode="6" anode="5"></wokwi-led>
 57 |   <wokwi-led color="white" lightColor="red" label="6 7" cathode="6" anode="7"></wokwi-led>
 58 |   <wokwi-led color="white" lightColor="red" label="6 8" cathode="6" anode="8"></wokwi-led>
 59 |   <wokwi-led color="white" lightColor="red" label="6 9" cathode="6" anode="9"></wokwi-led>
 60 |   <wokwi-led color="white" lightColor="red" label="6 10" cathode="6" anode="10"></wokwi-led>
 61 | </div>
 62 | <div>
 63 |   <wokwi-led color="white" lightColor="red" label="7 2" cathode="7" anode="2"></wokwi-led>
 64 |   <wokwi-led color="white" lightColor="red" label="7 3" cathode="7" anode="3"></wokwi-led>
 65 |   <wokwi-led color="white" lightColor="red" label="7 4" cathode="7" anode="4"></wokwi-led>
 66 |   <wokwi-led color="white" lightColor="red" label="7 5" cathode="7" anode="5"></wokwi-led>
 67 |   <wokwi-led color="white" lightColor="red" label="7 6" cathode="7" anode="6"></wokwi-led>
 68 |   <wokwi-led color="white" lightColor="red" label="7 8" cathode="7" anode="8"></wokwi-led>
 69 |   <wokwi-led color="white" lightColor="red" label="7 9" cathode="7" anode="9"></wokwi-led>
 70 |   <wokwi-led color="white" lightColor="red" label="7 10" cathode="7" anode="10"></wokwi-led>
 71 | </div>
 72 | <div>
 73 |   <wokwi-led color="white" lightColor="red" label="8 2" cathode="8" anode="2"></wokwi-led>
 74 |   <wokwi-led color="white" lightColor="red" label="8 3" cathode="8" anode="3"></wokwi-led>
 75 |   <wokwi-led color="white" lightColor="red" label="8 4" cathode="8" anode="4"></wokwi-led>
 76 |   <wokwi-led color="white" lightColor="red" label="8 5" cathode="8" anode="5"></wokwi-led>
 77 |   <wokwi-led color="white" lightColor="red" label="8 6" cathode="8" anode="6"></wokwi-led>
 78 |   <wokwi-led color="white" lightColor="red" label="8 7" cathode="8" anode="7"></wokwi-led>
 79 |   <wokwi-led color="white" lightColor="red" label="8 9" cathode="8" anode="9"></wokwi-led>
 80 |   <wokwi-led color="white" lightColor="red" label="8 10" cathode="8" anode="10"></wokwi-led>
 81 | </div>
 82 | <div>
 83 |   <wokwi-led color="white" lightColor="red" label="9 2" cathode="9" anode="2"></wokwi-led>
 84 |   <wokwi-led color="white" lightColor="red" label="9 3" cathode="9" anode="3"></wokwi-led>
 85 |   <wokwi-led color="white" lightColor="red" label="9 4" cathode="9" anode="4"></wokwi-led>
 86 |   <wokwi-led color="white" lightColor="red" label="9 5" cathode="9" anode="5"></wokwi-led>
 87 |   <wokwi-led color="white" lightColor="red" label="9 6" cathode="9" anode="6"></wokwi-led>
 88 |   <wokwi-led color="white" lightColor="red" label="9 7" cathode="9" anode="7"></wokwi-led>
 89 |   <wokwi-led color="white" lightColor="red" label="9 8" cathode="9" anode="8"></wokwi-led>
 90 |   <wokwi-led color="white" lightColor="red" label="9 10" cathode="9" anode="10"></wokwi-led>
 91 | </div>
 92 | <div>
 93 |   <wokwi-led color="white" lightColor="red" label="10 2" cathode="10" anode="2"></wokwi-led>
 94 |   <wokwi-led color="white" lightColor="red" label="10 3" cathode="10" anode="3"></wokwi-led>
 95 |   <wokwi-led color="white" lightColor="red" label="10 4" cathode="10" anode="4"></wokwi-led>
 96 |   <wokwi-led color="white" lightColor="red" label="10 5" cathode="10" anode="5"></wokwi-led>
 97 |   <wokwi-led color="white" lightColor="red" label="10 6" cathode="10" anode="6"></wokwi-led>
 98 |   <wokwi-led color="white" lightColor="red" label="10 7" cathode="10" anode="7"></wokwi-led>
 99 |   <wokwi-led color="white" lightColor="red" label="10 8" cathode="10" anode="8"></wokwi-led>
100 |   <wokwi-led color="white" lightColor="red" label="10 9" cathode="10" anode="9"></wokwi-led>
101 | </div>
102 | 
103 | **Challenge**: Can you change the code to display a pattern that looks like the letter "H"? 
104 | 
105 | **Advanced challenge**: Change the code to scroll the text "HELLO!" on the LED matrix.
106 | 


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/charlieplexing/sketch.ino:
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 1 | /**
 2 |    Charlieplexed LED Matrix Scanning demo.
 3 | 
 4 |    Copyright (C) 2019, Uri Shaked. Released under the MIT license.
 5 | */
 6 | 
 7 | #define SCAN_DELAY 50
 8 | 
 9 | byte LEDS[] = { 2, 3, 4, 5, 6, 7, 8, 9, 10 };
10 | const byte LED_COUNT = sizeof(LEDS);
11 | 
12 | void setup() {
13 | }
14 | 
15 | void loop() {
16 |   for (int i = 0; i < LED_COUNT; i++) {
17 |     for (int j = 0; j < LED_COUNT; j++) {
18 |       if (i != j) {
19 |         pinMode(LEDS[i], OUTPUT);
20 |         pinMode(LEDS[j], OUTPUT);
21 |         digitalWrite(LEDS[i], LOW);
22 |         digitalWrite(LEDS[j], HIGH);
23 |         delay(SCAN_DELAY);
24 |         pinMode(LEDS[i], INPUT);
25 |         pinMode(LEDS[j], INPUT);
26 |       }
27 |     }
28 |   }
29 | }
30 | 


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/charlieplexing/thumbnail.png:
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https://raw.githubusercontent.com/wokwi/wokwi-playgrounds/a4cbf14c128b5dc971ad0a1dc421513075f4e297/charlieplexing/thumbnail.png


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/dice-roller/lesson.json:
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1 | {
2 |   "title": "Dice Roller",
3 |   "thumbnail": "thumbnail.png"
4 | }
5 | 


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/dice-roller/lesson.md:
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 1 | ## Game Dice Playground 🎲
 2 | 
 3 | Write your code in the editor on the right, and the click on "Run code"
 4 | to see it in action:
 5 | 
 6 | <div style="display: inline-grid; grid-template-columns: 1fr 1fr 1fr">
 7 |   <wokwi-led color="red" label="2"></wokwi-led>
 8 |   <span></span>
 9 |   <wokwi-led color="red" label="3"></wokwi-led>
10 |   <wokwi-led color="red" label="4"></wokwi-led>
11 |   <wokwi-led color="red" label="5"></wokwi-led>
12 |   <wokwi-led color="red" label="6"></wokwi-led>
13 |   <wokwi-led color="red" label="7"></wokwi-led>
14 |   <span></span>
15 |   <wokwi-led color="red" label="8"></wokwi-led>
16 | </div>
17 | 
18 | <div style="display: inline-grid; grid-template-columns: 1fr 1fr 1fr; margin-left: 16px">
19 |   <wokwi-led color="green" label="9"></wokwi-led>
20 |   <span></span>
21 |   <wokwi-led color="green" label="10"></wokwi-led>
22 |   <wokwi-led color="green" label="11"></wokwi-led>
23 |   <wokwi-led color="green" label="12"></wokwi-led>
24 |   <wokwi-led color="green" label="A3"></wokwi-led>
25 |   <wokwi-led color="green" label="A4"></wokwi-led>
26 |   <span></span>
27 |   <wokwi-led color="green" label="A5"></wokwi-led>
28 | </div>
29 | 
30 | <div style="display: inline-block; position: relative; margin-left: 16px">
31 |   <wokwi-pushbutton label="A0" color="green"></wokwi-pushbutton>
32 |   <span style="position: absolute; top: 26px; left: -4px; font-size: 10px; color: #888">
33 |     A0
34 |   </span>
35 | </div>
36 | 
37 | <wokwi-arduino-uno></wokwi-arduino-uno>
38 | 


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/dice-roller/sketch.ino:
--------------------------------------------------------------------------------
 1 | // Arduino Dice Roller
 2 | // Copyright (C) 2020, Uri Shaked
 3 | 
 4 | #define BUTTON_PIN A0
 5 | 
 6 | const byte die1Pins[] = { 2, 3, 4, 5, 6, 7, 8};
 7 | const byte die2Pins[] = { 9, 10, 11, 12, A3, A4, A5};
 8 | 
 9 | void setup() {
10 |   pinMode(A0, INPUT_PULLUP);
11 |   for (byte i = 0; i < 7; i++) {
12 |     pinMode(die1Pins[i], OUTPUT);
13 |     pinMode(die2Pins[i], OUTPUT);
14 |   }
15 | }
16 | 
17 | void displayNumber(const byte pins[], byte number) {
18 |   digitalWrite(pins[0], number > 1 ? HIGH : LOW); // top-left
19 |   digitalWrite(pins[1], number > 3 ? HIGH : LOW); // top-right
20 |   digitalWrite(pins[2], number == 6 ? HIGH : LOW); // middle-left
21 |   digitalWrite(pins[3], number % 2 == 1 ? HIGH : LOW); // center
22 |   digitalWrite(pins[4], number == 6 ? HIGH : LOW); // middle-right
23 |   digitalWrite(pins[5], number > 3 ? HIGH : LOW); // bottom-left
24 |   digitalWrite(pins[6], number > 1 ? HIGH : LOW); // bottom-right
25 | }
26 | 
27 | bool randomReady = false;
28 | 
29 | void loop() {
30 |   bool buttonPressed = digitalRead(BUTTON_PIN) == LOW;
31 |   if (!randomReady && buttonPressed) {
32 |     // Use the time until the first button press
33 |     // to initialize the random number generator
34 |     randomSeed(micros());
35 |     randomReady = true;
36 |   }
37 | 
38 |   if (buttonPressed) {
39 |     for (byte i = 0; i < 10; i++) {
40 |       int num1 = random(1, 7);
41 |       int num2 = random(1, 7);
42 |       displayNumber(die1Pins, num1);
43 |       displayNumber(die2Pins, num2);
44 |       delay(50 + i * 20);
45 |     }
46 |   }
47 | }
48 | 


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/dice-roller/thumbnail.png:
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https://raw.githubusercontent.com/wokwi/wokwi-playgrounds/a4cbf14c128b5dc971ad0a1dc421513075f4e297/dice-roller/thumbnail.png


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/eeprom/lesson.json:
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1 | {
2 |   "title": "EEPROM Playground"
3 | }
4 | 


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/eeprom/lesson.md:
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 1 | # EEPROM Playground
 2 | 
 3 | Run the simulation by clicking on <strong>Run Code</strong>, then interact with the program in the virtual Serial Monitor.
 4 | 
 5 | The program counts how many times you pressed the green button, and also the total time the button was pressed. It stores this data in the Arduino's <strong>EEPROM</strong>, so the information is kept even if you refresh this page.
 6 | 
 7 | <wokwi-pushbutton pin="9" color="green"></wokwi-pushbutton>
 8 | 
 9 | <wokwi-arduino-uno></wokwi-arduino-uno>
10 | 


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/eeprom/sketch.ino:
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  1 | #include <EEPROM.h>
  2 | 
  3 | #define BUTTON_PIN 9
  4 | #define DEBOUNCE_TIME 50
  5 | 
  6 | struct UserData {
  7 |   bool firstTime;
  8 |   char name[32];
  9 |   long pressCounter;
 10 |   double buttonSeconds;
 11 | };
 12 | 
 13 | struct UserData userData;
 14 | 
 15 | void initUserData() {
 16 |   userData.firstTime = true;
 17 |   memset(userData.name, 0, sizeof(userData.name));
 18 |   userData.pressCounter = 0;
 19 |   userData.buttonSeconds = 0;
 20 | }
 21 | 
 22 | void saveUserData() {
 23 |   EEPROM.put(0, userData);
 24 | }
 25 | 
 26 | void inputUserName() {
 27 |   // Remove old data from the Serial input buffer
 28 |   while (Serial.available()) {
 29 |     Serial.read();
 30 |   }
 31 | 
 32 |   Serial.println("Welcome to the Arduino EEPROM Playground!");
 33 |   Serial.println("Please type your name:");
 34 | 
 35 |   int inputChar = Serial.read();
 36 |   int index = 0;
 37 |   while (inputChar != '\n') {
 38 |     if (inputChar != -1 && index < sizeof(userData.name) - 1) {
 39 |       userData.name[index] = inputChar;
 40 |       index++;
 41 |     }
 42 |     inputChar = Serial.read();
 43 |   }
 44 |   userData.name[index] = '\0'; // End of string
 45 |   userData.firstTime = false;
 46 | 
 47 |   saveUserData();
 48 | 
 49 |   Serial.print("Nice to meet you, ");
 50 |   Serial.print(userData.name);
 51 |   Serial.println("!");
 52 | 
 53 |   Serial.println("Now, press the button...");
 54 | }
 55 | 
 56 | void greetUser() {
 57 |   Serial.print("Good you see you again, ");
 58 |   Serial.print(userData.name);
 59 |   Serial.println("!");
 60 | 
 61 |   Serial.println("To delete all data, write 'E'.");
 62 | }
 63 | 
 64 | void printButtonStats() {
 65 |   Serial.print("You pressed the button ");
 66 |   Serial.print(userData.pressCounter);
 67 |   Serial.print(" times, for a total of ");
 68 |   Serial.print(userData.buttonSeconds);
 69 |   Serial.println(" seconds.");
 70 | }
 71 | 
 72 | void setup() {
 73 |   pinMode(BUTTON_PIN, INPUT_PULLUP);
 74 |   Serial.begin(115200);
 75 | 
 76 |   EEPROM.get(0, userData);
 77 | 
 78 |   if (userData.firstTime) {
 79 |     initUserData();
 80 |     inputUserName();
 81 |   } else {
 82 |     greetUser();
 83 |     printButtonStats();
 84 |   }
 85 | }
 86 | 
 87 | bool buttonPressed() {
 88 |   return digitalRead(BUTTON_PIN) == LOW;
 89 | }
 90 | 
 91 | void loop() {
 92 |   // Wait for button press
 93 |   if (buttonPressed()) {
 94 |     long pressStartTime = millis();
 95 |     delay(DEBOUNCE_TIME); // Wait for the button to settle
 96 |     while (buttonPressed()); // and to be released...
 97 | 
 98 |     userData.pressCounter++;
 99 |     userData.buttonSeconds += (double)(millis() - pressStartTime) / 1000;
100 |     saveUserData();
101 | 
102 |     printButtonStats();
103 |   }
104 | 
105 |   if (Serial.available() && Serial.read() == 'E') {
106 |     Serial.print("Erasing your data...");
107 |     initUserData();
108 |     saveUserData();
109 |     Serial.println("DONE!");
110 |     Serial.println("");
111 | 
112 |     // Now start from the beginning...
113 |     inputUserName();
114 |   }
115 | }
116 | 


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/electronic-safe/SafeState.cpp:
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 1 | /**
 2 |    Arduino Electronic Safe
 3 | 
 4 |    Copyright (C) 2020, Uri Shaked.
 5 |    Released under the MIT License.
 6 | */
 7 | 
 8 | #include <Arduino.h>
 9 | #include <EEPROM.h>
10 | #include "SafeState.h"
11 | 
12 | /* Safe state */
13 | #define EEPROM_ADDR_LOCKED   0
14 | #define EEPROM_ADDR_CODE_LEN 1
15 | #define EEPROM_ADDR_CODE     2
16 | #define EEPROM_EMPTY         0xff
17 | 
18 | #define SAFE_STATE_OPEN (char)0
19 | #define SAFE_STATE_LOCKED (char)1
20 | 
21 | SafeState::SafeState() {
22 |   this->_locked = EEPROM.read(EEPROM_ADDR_LOCKED) == SAFE_STATE_LOCKED;
23 | }
24 | 
25 | void SafeState::lock() {
26 |   this->setLock(true);
27 | }
28 | 
29 | bool SafeState::locked() {
30 |   return this->_locked;
31 | }
32 | 
33 | bool SafeState::hasCode() {
34 |   auto codeLength = EEPROM.read(EEPROM_ADDR_CODE_LEN);
35 |   return codeLength != EEPROM_EMPTY;
36 | }
37 | 
38 | void SafeState::setCode(String newCode) {
39 |   EEPROM.write(EEPROM_ADDR_CODE_LEN, newCode.length());
40 |   for (byte i = 0; i < newCode.length(); i++) {
41 |     EEPROM.write(EEPROM_ADDR_CODE + i, newCode[i]);
42 |   }
43 | }
44 | 
45 | bool SafeState::unlock(String code) {
46 |   auto codeLength = EEPROM.read(EEPROM_ADDR_CODE_LEN);
47 |   if (codeLength == EEPROM_EMPTY) {
48 |     // There was no code, so unlock always succeeds
49 |     this->setLock(false);
50 |     return true;
51 |   }
52 |   if (code.length() != codeLength) {
53 |     return false;
54 |   }
55 |   for (byte i = 0; i < code.length(); i++) {
56 |     auto digit = EEPROM.read(EEPROM_ADDR_CODE + i);
57 |     if (digit != code[i]) {
58 |       return false;
59 |     }
60 |   }
61 |   this->setLock(false);
62 |   return true;
63 | }
64 | 
65 | void SafeState::setLock(bool locked) {
66 |   this->_locked = locked;
67 |   EEPROM.write(EEPROM_ADDR_LOCKED, locked ? SAFE_STATE_LOCKED : SAFE_STATE_OPEN);
68 | }
69 | 
70 | 


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/electronic-safe/SafeState.h:
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 1 | /**
 2 |    Arduino Electronic Safe
 3 | 
 4 |    Copyright (C) 2020, Uri Shaked.
 5 |    Released under the MIT License.
 6 | */
 7 | 
 8 | #ifndef SAFESTATE_H
 9 | #define SAFESTATE_H
10 | 
11 | class SafeState {
12 |   public:
13 |     SafeState();
14 |     void lock();
15 |     bool unlock(String code);
16 |     bool locked();
17 |     bool hasCode();
18 |     void setCode(String newCode);
19 | 
20 |   private:
21 |     void setLock(bool locked);
22 |     bool _locked;
23 | };
24 | 
25 | #endif /* SAFESTATE_H */
26 | 


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/electronic-safe/icons.cpp:
--------------------------------------------------------------------------------
 1 | /**
 2 |    Arduino Electronic Safe
 3 | 
 4 |    Copyright (C) 2020, Uri Shaked.
 5 |    Released under the MIT License.
 6 | */
 7 | 
 8 | #include <Arduino.h>
 9 | #include "icons.h"
10 | 
11 | const byte iconLocked[8] PROGMEM = {
12 |   0b01110,
13 |   0b10001,
14 |   0b10001,
15 |   0b11111,
16 |   0b11011,
17 |   0b11011,
18 |   0b11111,
19 | };
20 | 
21 | const byte iconUnlocked[8] PROGMEM = {
22 |   0b01110,
23 |   0b10000,
24 |   0b10000,
25 |   0b11111,
26 |   0b11011,
27 |   0b11011,
28 |   0b11111,
29 | };
30 | 
31 | void init_icons(LiquidCrystal &lcd) {
32 |   byte icon[8];
33 |   memcpy_P(icon, iconLocked, sizeof(icon));
34 |   lcd.createChar(ICON_LOCKED_CHAR, icon);
35 |   memcpy_P(icon, iconUnlocked, sizeof(icon));
36 |   lcd.createChar(ICON_UNLOCKED_CHAR, icon);
37 | }
38 | 


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/electronic-safe/icons.h:
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 1 | /**
 2 |    Arduino Electronic Safe
 3 | 
 4 |    Copyright (C) 2020, Uri Shaked.
 5 |    Released under the MIT License.
 6 | */
 7 | 
 8 | #ifndef ICONS_H
 9 | #define ICONS_H
10 | 
11 | #include <LiquidCrystal.h>
12 | 
13 | // Our custom icon numbers
14 | #define ICON_LOCKED_CHAR   (byte)0
15 | #define ICON_UNLOCKED_CHAR (byte)1
16 | 
17 | // This is a standard icon on the LCD1602 character set
18 | #define ICON_RIGHT_ARROW   (byte)126
19 | 
20 | void init_icons(LiquidCrystal &lcd);
21 | 
22 | #endif /* ICONS_H */
23 | 


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/electronic-safe/lesson.json:
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1 | {
2 |   "title": "Electronic Safe",
3 |   "thumbnail": "thumbnail.png",
4 |   "files": ["icons.cpp", "icons.h", "SafeState.cpp", "SafeState.h"]
5 | }
6 | 


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/electronic-safe/lesson.md:
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 1 | # Arduino Electronic Safe
 2 | 
 3 | Project from [Good Arduino Code](https://goodarduinocode.com?utm_source=wokwi&utm_medium=site&utm_campaign=electronic_safe). For more information, check out the [Electronic Safe Project Page](https://goodarduinocode.com/projects/electronic-safe?utm_source=wokwi&utm_medium=site&utm_campaign=electronic_safe).
 4 | 
 5 | Click on <b>Run code</b> to see it in action!
 6 | 
 7 | <div style="display: flex; flex-direction: column; align-items: center">
 8 |   <wokwi-lcd1602 pinList="rs:12 enable:11 d7:7 d6:8 d5:9 d4:10"></wokwi-lcd1602>
 9 |   <wokwi-membrane-keypad rows="5,4,3,2" cols="A3,A2,A1,A0"></wokwi-membrane-keypad>
10 |   <div style="position: relative">
11 |     <small style="position: absolute; left: 20px">Locked</small>
12 |     <wokwi-servo pin="6"></wokwi-servo>
13 |     <small style="position: absolute; left: 180px; top: 60px">Open</small>
14 |   </div>
15 | </div>
16 | 


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/electronic-safe/sketch.ino:
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  1 | /**
  2 |    Arduino Electronic Safe
  3 | 
  4 |    Copyright (C) 2020, Uri Shaked.
  5 |    Released under the MIT License.
  6 | */
  7 | 
  8 | #include <LiquidCrystal.h>
  9 | #include <Keypad.h>
 10 | #include <Servo.h>
 11 | #include "SafeState.h"
 12 | #include "icons.h"
 13 | 
 14 | /* Locking mechanism definitions */
 15 | #define SERVO_PIN 6
 16 | #define SERVO_LOCK_POS   20
 17 | #define SERVO_UNLOCK_POS 90
 18 | Servo lockServo;
 19 | 
 20 | /* Display */
 21 | LiquidCrystal lcd(12, 11, 10, 9, 8, 7);
 22 | 
 23 | /* Keypad setup */
 24 | const byte KEYPAD_ROWS = 4;
 25 | const byte KEYPAD_COLS = 4;
 26 | byte rowPins[KEYPAD_ROWS] = {5, 4, 3, 2};
 27 | byte colPins[KEYPAD_COLS] = {A3, A2, A1, A0};
 28 | char keys[KEYPAD_ROWS][KEYPAD_COLS] = {
 29 |   {'1', '2', '3', 'A'},
 30 |   {'4', '5', '6', 'B'},
 31 |   {'7', '8', '9', 'C'},
 32 |   {'*', '0', '#', 'D'}
 33 | };
 34 | 
 35 | Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, KEYPAD_ROWS, KEYPAD_COLS);
 36 | 
 37 | /* SafeState stores the secret code in EEPROM */
 38 | SafeState safeState;
 39 | 
 40 | void lock() {
 41 |   lockServo.write(SERVO_LOCK_POS);
 42 |   safeState.lock();
 43 | }
 44 | 
 45 | void unlock() {
 46 |   lockServo.write(SERVO_UNLOCK_POS);
 47 | }
 48 | 
 49 | void showStartupMessage() {
 50 |   lcd.setCursor(4, 0);
 51 |   lcd.print("Welcome!");
 52 |   delay(1000);
 53 | 
 54 |   lcd.setCursor(0, 2);
 55 |   String message = "ArduinoSafe v1.0";
 56 |   for (byte i = 0; i < message.length(); i++) {
 57 |     lcd.print(message[i]);
 58 |     delay(100);
 59 |   }
 60 |   delay(500);
 61 | }
 62 | 
 63 | String inputSecretCode() {
 64 |   lcd.setCursor(5, 1);
 65 |   lcd.print("[____]");
 66 |   lcd.setCursor(6, 1);
 67 |   String result = "";
 68 |   while (result.length() < 4) {
 69 |     char key = keypad.getKey();
 70 |     if (key >= '0' && key <= '9') {
 71 |       lcd.print('*');
 72 |       result += key;
 73 |     }
 74 |   }
 75 |   return result;
 76 | }
 77 | 
 78 | void showWaitScreen(int delayMillis) {
 79 |   lcd.setCursor(2, 1);
 80 |   lcd.print("[..........]");
 81 |   lcd.setCursor(3, 1);
 82 |   for (byte i = 0; i < 10; i++) {
 83 |     delay(delayMillis);
 84 |     lcd.print("=");
 85 |   }
 86 | }
 87 | 
 88 | bool setNewCode() {
 89 |   lcd.clear();
 90 |   lcd.setCursor(0, 0);
 91 |   lcd.print("Enter new code:");
 92 |   String newCode = inputSecretCode();
 93 | 
 94 |   lcd.clear();
 95 |   lcd.setCursor(0, 0);
 96 |   lcd.print("Confirm new code");
 97 |   String confirmCode = inputSecretCode();
 98 | 
 99 |   if (newCode.equals(confirmCode)) {
100 |     safeState.setCode(newCode);
101 |     return true;
102 |   } else {
103 |     lcd.clear();
104 |     lcd.setCursor(1, 0);
105 |     lcd.print("Code mismatch");
106 |     lcd.setCursor(0, 1);
107 |     lcd.print("Safe not locked!");
108 |     delay(2000);
109 |     return false;
110 |   }
111 | }
112 | 
113 | void showUnlockMessage() {
114 |   lcd.clear();
115 |   lcd.setCursor(0, 0);
116 |   lcd.write(ICON_UNLOCKED_CHAR);
117 |   lcd.setCursor(4, 0);
118 |   lcd.print("Unlocked!");
119 |   lcd.setCursor(15, 0);
120 |   lcd.write(ICON_UNLOCKED_CHAR);
121 |   delay(1000);
122 | }
123 | 
124 | void safeUnlockedLogic() {
125 |   lcd.clear();
126 | 
127 |   lcd.setCursor(0, 0);
128 |   lcd.write(ICON_UNLOCKED_CHAR);
129 |   lcd.setCursor(2, 0);
130 |   lcd.print(" # to lock");
131 |   lcd.setCursor(15, 0);
132 |   lcd.write(ICON_UNLOCKED_CHAR);
133 | 
134 |   bool newCodeNeeded = true;
135 | 
136 |   if (safeState.hasCode()) {
137 |     lcd.setCursor(0, 1);
138 |     lcd.print("  A = new code");
139 |     newCodeNeeded = false;
140 |   }
141 | 
142 |   auto key = keypad.getKey();
143 |   while (key != 'A' && key != '#') {
144 |     key = keypad.getKey();
145 |   }
146 | 
147 |   bool readyToLock = true;
148 |   if (key == 'A' || newCodeNeeded) {
149 |     readyToLock = setNewCode();
150 |   }
151 | 
152 |   if (readyToLock) {
153 |     lcd.clear();
154 |     lcd.setCursor(5, 0);
155 |     lcd.write(ICON_UNLOCKED_CHAR);
156 |     lcd.print(" ");
157 |     lcd.write(ICON_RIGHT_ARROW);
158 |     lcd.print(" ");
159 |     lcd.write(ICON_LOCKED_CHAR);
160 | 
161 |     safeState.lock();
162 |     lock();
163 |     showWaitScreen(100);
164 |   }
165 | }
166 | 
167 | void safeLockedLogic() {
168 |   lcd.clear();
169 |   lcd.setCursor(0, 0);
170 |   lcd.write(ICON_LOCKED_CHAR);
171 |   lcd.print(" Safe Locked! ");
172 |   lcd.write(ICON_LOCKED_CHAR);
173 | 
174 |   String userCode = inputSecretCode();
175 |   bool unlockedSuccessfully = safeState.unlock(userCode);
176 |   showWaitScreen(200);
177 | 
178 |   if (unlockedSuccessfully) {
179 |     showUnlockMessage();
180 |     unlock();
181 |   } else {
182 |     lcd.clear();
183 |     lcd.setCursor(0, 0);
184 |     lcd.print("Access Denied!");
185 |     showWaitScreen(1000);
186 |   }
187 | }
188 | 
189 | void setup() {
190 |   lcd.begin(16, 2);
191 |   init_icons(lcd);
192 | 
193 |   lockServo.attach(SERVO_PIN);
194 | 
195 |   /* Make sure the physical lock is sync with the EEPROM state */
196 |   Serial.begin(115200);
197 |   if (safeState.locked()) {
198 |     lock();
199 |   } else {
200 |     unlock();
201 |   }
202 | 
203 |   showStartupMessage();
204 | }
205 | 
206 | void loop() {
207 |   if (safeState.locked()) {
208 |     safeLockedLogic();
209 |   } else {
210 |     safeUnlockedLogic();
211 |   }
212 | }
213 | 


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/electronic-safe/thumbnail.png:
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https://raw.githubusercontent.com/wokwi/wokwi-playgrounds/a4cbf14c128b5dc971ad0a1dc421513075f4e297/electronic-safe/thumbnail.png


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/fastled/lesson.json:
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1 | {
2 |   "title": "FastLED ColorPalette",
3 |   "thumbnail": "thumbnail.png"
4 | }
5 | 


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/fastled/lesson.md:
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 1 | ## FastLED Color Palette Playground 
 2 | 
 3 | The NeoPixel strip is connected to Arduino pin 5. 
 4 | Click the "Run Code" button on the right to see it in action:
 5 | 
 6 | <span style="background: #333; padding: 4px 4px 0;">
 7 |   <wokwi-neopixel pin="5" pixel="0"></wokwi-neopixel>
 8 |   <wokwi-neopixel pin="5" pixel="1"></wokwi-neopixel>
 9 |   <wokwi-neopixel pin="5" pixel="2"></wokwi-neopixel>
10 |   <wokwi-neopixel pin="5" pixel="3"></wokwi-neopixel>
11 |   <wokwi-neopixel pin="5" pixel="4"></wokwi-neopixel>
12 |   <wokwi-neopixel pin="5" pixel="5"></wokwi-neopixel>
13 |   <wokwi-neopixel pin="5" pixel="6"></wokwi-neopixel>
14 |   <wokwi-neopixel pin="5" pixel="7"></wokwi-neopixel>
15 |   <wokwi-neopixel pin="5" pixel="8"></wokwi-neopixel>
16 |   <wokwi-neopixel pin="5" pixel="9"></wokwi-neopixel>
17 |   <wokwi-neopixel pin="5" pixel="10"></wokwi-neopixel>
18 |   <wokwi-neopixel pin="5" pixel="11"></wokwi-neopixel>
19 |   <wokwi-neopixel pin="5" pixel="12"></wokwi-neopixel>
20 |   <wokwi-neopixel pin="5" pixel="13"></wokwi-neopixel>
21 |   <wokwi-neopixel pin="5" pixel="14"></wokwi-neopixel>
22 |   <wokwi-neopixel pin="5" pixel="15"></wokwi-neopixel>
23 | </span>
24 | 


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/fastled/sketch.ino:
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  1 | // Source: https://github.com/FastLED/FastLED/blob/master/examples/ColorPalette/ColorPalette.ino
  2 | 
  3 | #include <FastLED.h>
  4 | 
  5 | #define LED_PIN     5
  6 | #define NUM_LEDS    16
  7 | #define BRIGHTNESS  255
  8 | #define LED_TYPE    WS2812
  9 | #define COLOR_ORDER GRB
 10 | CRGB leds[NUM_LEDS];
 11 | 
 12 | #define UPDATES_PER_SECOND 100
 13 | 
 14 | // This example shows several ways to set up and use 'palettes' of colors
 15 | // with FastLED.
 16 | //
 17 | // These compact palettes provide an easy way to re-colorize your
 18 | // animation on the fly, quickly, easily, and with low overhead.
 19 | //
 20 | // USING palettes is MUCH simpler in practice than in theory, so first just
 21 | // run this sketch, and watch the pretty lights as you then read through
 22 | // the code.  Although this sketch has eight (or more) different color schemes,
 23 | // the entire sketch compiles down to about 6.5K on AVR.
 24 | //
 25 | // FastLED provides a few pre-configured color palettes, and makes it
 26 | // extremely easy to make up your own color schemes with palettes.
 27 | //
 28 | // Some notes on the more abstract 'theory and practice' of
 29 | // FastLED compact palettes are at the bottom of this file.
 30 | 
 31 | 
 32 | 
 33 | CRGBPalette16 currentPalette;
 34 | TBlendType    currentBlending;
 35 | 
 36 | extern CRGBPalette16 myRedWhiteBluePalette;
 37 | extern const TProgmemPalette16 myRedWhiteBluePalette_p PROGMEM;
 38 | 
 39 | void setup() {
 40 |   FastLED.addLeds<LED_TYPE, LED_PIN, COLOR_ORDER>(leds, NUM_LEDS).setCorrection( TypicalLEDStrip );
 41 |   FastLED.setBrightness(  BRIGHTNESS );
 42 | 
 43 |   currentPalette = RainbowColors_p;
 44 |   currentBlending = LINEARBLEND;
 45 | }
 46 | 
 47 | 
 48 | void loop()
 49 | {
 50 |   ChangePalettePeriodically();
 51 | 
 52 |   static uint8_t startIndex = 0;
 53 |   startIndex = startIndex + 1; /* motion speed */
 54 | 
 55 |   FillLEDsFromPaletteColors( startIndex);
 56 | 
 57 |   FastLED.show();
 58 |   FastLED.delay(1000 / UPDATES_PER_SECOND);
 59 | }
 60 | 
 61 | void FillLEDsFromPaletteColors( uint8_t colorIndex)
 62 | {
 63 |   uint8_t brightness = 255;
 64 | 
 65 |   for ( int i = 0; i < NUM_LEDS; i++) {
 66 |     leds[i] = ColorFromPalette( currentPalette, colorIndex, brightness, currentBlending);
 67 |     colorIndex += 3;
 68 |   }
 69 | }
 70 | 
 71 | 
 72 | // There are several different palettes of colors demonstrated here.
 73 | //
 74 | // FastLED provides several 'preset' palettes: RainbowColors_p, RainbowStripeColors_p,
 75 | // OceanColors_p, CloudColors_p, LavaColors_p, ForestColors_p, and PartyColors_p.
 76 | //
 77 | // Additionally, you can manually define your own color palettes, or you can write
 78 | // code that creates color palettes on the fly.  All are shown here.
 79 | 
 80 | void ChangePalettePeriodically()
 81 | {
 82 |   uint8_t secondHand = (millis() / 1000) % 60;
 83 |   static uint8_t lastSecond = 99;
 84 | 
 85 |   if ( lastSecond != secondHand) {
 86 |     lastSecond = secondHand;
 87 |     if ( secondHand ==  0)  {
 88 |       currentPalette = RainbowColors_p;
 89 |       currentBlending = LINEARBLEND;
 90 |     }
 91 |     if ( secondHand == 10)  {
 92 |       currentPalette = RainbowStripeColors_p;
 93 |       currentBlending = NOBLEND;
 94 |     }
 95 |     if ( secondHand == 15)  {
 96 |       currentPalette = RainbowStripeColors_p;
 97 |       currentBlending = LINEARBLEND;
 98 |     }
 99 |     if ( secondHand == 20)  {
100 |       SetupPurpleAndGreenPalette();
101 |       currentBlending = LINEARBLEND;
102 |     }
103 |     if ( secondHand == 25)  {
104 |       SetupTotallyRandomPalette();
105 |       currentBlending = LINEARBLEND;
106 |     }
107 |     if ( secondHand == 30)  {
108 |       SetupBlackAndWhiteStripedPalette();
109 |       currentBlending = NOBLEND;
110 |     }
111 |     if ( secondHand == 35)  {
112 |       SetupBlackAndWhiteStripedPalette();
113 |       currentBlending = LINEARBLEND;
114 |     }
115 |     if ( secondHand == 40)  {
116 |       currentPalette = CloudColors_p;
117 |       currentBlending = LINEARBLEND;
118 |     }
119 |     if ( secondHand == 45)  {
120 |       currentPalette = PartyColors_p;
121 |       currentBlending = LINEARBLEND;
122 |     }
123 |     if ( secondHand == 50)  {
124 |       currentPalette = myRedWhiteBluePalette_p;
125 |       currentBlending = NOBLEND;
126 |     }
127 |     if ( secondHand == 55)  {
128 |       currentPalette = myRedWhiteBluePalette_p;
129 |       currentBlending = LINEARBLEND;
130 |     }
131 |   }
132 | }
133 | 
134 | // This function fills the palette with totally random colors.
135 | void SetupTotallyRandomPalette()
136 | {
137 |   for ( int i = 0; i < 16; i++) {
138 |     currentPalette[i] = CHSV( random8(), 255, random8());
139 |   }
140 | }
141 | 
142 | // This function sets up a palette of black and white stripes,
143 | // using code.  Since the palette is effectively an array of
144 | // sixteen CRGB colors, the various fill_* functions can be used
145 | // to set them up.
146 | void SetupBlackAndWhiteStripedPalette()
147 | {
148 |   // 'black out' all 16 palette entries...
149 |   fill_solid( currentPalette, 16, CRGB::Black);
150 |   // and set every fourth one to white.
151 |   currentPalette[0] = CRGB::White;
152 |   currentPalette[4] = CRGB::White;
153 |   currentPalette[8] = CRGB::White;
154 |   currentPalette[12] = CRGB::White;
155 | 
156 | }
157 | 
158 | // This function sets up a palette of purple and green stripes.
159 | void SetupPurpleAndGreenPalette()
160 | {
161 |   CRGB purple = CHSV( HUE_PURPLE, 255, 255);
162 |   CRGB green  = CHSV( HUE_GREEN, 255, 255);
163 |   CRGB black  = CRGB::Black;
164 | 
165 |   currentPalette = CRGBPalette16(
166 |                      green,  green,  black,  black,
167 |                      purple, purple, black,  black,
168 |                      green,  green,  black,  black,
169 |                      purple, purple, black,  black );
170 | }
171 | 
172 | 
173 | // This example shows how to set up a static color palette
174 | // which is stored in PROGMEM (flash), which is almost always more
175 | // plentiful than RAM.  A static PROGMEM palette like this
176 | // takes up 64 bytes of flash.
177 | const TProgmemPalette16 myRedWhiteBluePalette_p PROGMEM =
178 | {
179 |   CRGB::Red,
180 |   CRGB::Gray, // 'white' is too bright compared to red and blue
181 |   CRGB::Blue,
182 |   CRGB::Black,
183 | 
184 |   CRGB::Red,
185 |   CRGB::Gray,
186 |   CRGB::Blue,
187 |   CRGB::Black,
188 | 
189 |   CRGB::Red,
190 |   CRGB::Red,
191 |   CRGB::Gray,
192 |   CRGB::Gray,
193 |   CRGB::Blue,
194 |   CRGB::Blue,
195 |   CRGB::Black,
196 |   CRGB::Black
197 | };
198 | 
199 | 
200 | 
201 | // Additional notes on FastLED compact palettes:
202 | //
203 | // Normally, in computer graphics, the palette (or "color lookup table")
204 | // has 256 entries, each containing a specific 24-bit RGB color.  You can then
205 | // index into the color palette using a simple 8-bit (one byte) value.
206 | // A 256-entry color palette takes up 768 bytes of RAM, which on Arduino
207 | // is quite possibly "too many" bytes.
208 | //
209 | // FastLED does offer traditional 256-element palettes, for setups that
210 | // can afford the 768-byte cost in RAM.
211 | //
212 | // However, FastLED also offers a compact alternative.  FastLED offers
213 | // palettes that store 16 distinct entries, but can be accessed AS IF
214 | // they actually have 256 entries; this is accomplished by interpolating
215 | // between the 16 explicit entries to create fifteen intermediate palette
216 | // entries between each pair.
217 | //
218 | // So for example, if you set the first two explicit entries of a compact
219 | // palette to Green (0,255,0) and Blue (0,0,255), and then retrieved
220 | // the first sixteen entries from the virtual palette (of 256), you'd get
221 | // Green, followed by a smooth gradient from green-to-blue, and then Blue.
222 | 


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/fastled/thumbnail.png:
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https://raw.githubusercontent.com/wokwi/wokwi-playgrounds/a4cbf14c128b5dc971ad0a1dc421513075f4e297/fastled/thumbnail.png


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/happy-birthday/gift.h:
--------------------------------------------------------------------------------
 1 | // OLED Animation: gift heart
 2 | // Code auto-generated by https://wokwi.com/animator, graphics by icons8.com
 3 | 
 4 | #ifndef __GIFT_H__
 5 | #define __GIFT_H__
 6 | 
 7 | #define GIFT_FRAME_DELAY (42)
 8 | #define GIFT_FRAME_WIDTH (48)
 9 | #define GIFT_FRAME_HEIGHT (48)
10 | #define GIFT_FRAME_COUNT (sizeof(gift_frames) / sizeof(gift_frames[0]))
11 | const byte PROGMEM gift_frames[][288] = {
12 |   {0,0,0,0,0,0,0,124,0,0,62,0,0,255,0,0,255,0,1,195,128,1,195,128,1,129,192,3,129,128,1,128,192,3,1,128,1,128,96,6,1,128,1,128,112,14,1,128,1,192,48,12,3,128,0,224,24,24,7,0,0,112,28,56,14,0,0,63,15,240,252,0,127,255,255,255,255,254,127,255,255,255,255,254,96,0,63,252,0,6,96,0,48,12,0,6,96,0,48,12,0,6,96,0,48,12,0,6,96,0,48,12,0,6,96,0,48,12,0,6,96,0,48,12,0,6,127,255,255,255,255,254,127,255,255,255,255,254,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,31,255,255,255,255,248,31,255,255,255,255,248,0,0,0,0,0,0},
13 |   {0,0,0,0,0,0,0,124,0,0,62,0,0,255,0,0,255,0,1,195,128,1,195,128,1,129,192,3,129,128,1,128,192,3,1,128,1,128,96,6,1,128,1,128,112,14,1,128,1,192,48,12,3,128,0,224,24,24,7,0,0,112,28,56,14,0,0,63,15,240,252,0,127,255,255,255,255,254,127,255,255,255,255,254,96,0,63,252,0,6,96,0,48,12,0,6,96,0,48,12,0,6,96,0,48,12,0,6,96,0,48,12,0,6,96,0,48,12,0,6,96,0,48,12,0,6,127,255,255,255,255,254,127,255,255,255,255,254,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,31,255,255,255,255,248,31,255,255,255,255,248,0,0,0,0,0,0},
14 |   {0,0,0,0,0,0,0,124,0,0,62,0,0,255,0,0,255,0,1,195,128,1,195,128,1,129,192,3,129,128,1,128,192,3,1,128,1,128,96,6,1,128,1,128,112,14,1,128,1,192,48,12,3,128,0,224,24,24,7,0,0,112,28,56,14,0,0,63,15,240,252,0,127,255,255,255,255,254,127,255,255,255,255,254,96,0,63,252,0,6,96,0,48,12,0,6,96,0,48,12,0,6,96,0,48,12,0,6,96,0,48,12,0,6,96,0,48,12,0,6,96,0,48,12,0,6,127,255,255,255,255,254,127,255,255,255,255,254,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,31,255,255,255,255,248,31,255,255,255,255,248,0,0,0,0,0,0},
15 |   {0,0,0,0,0,0,0,124,0,0,62,0,0,255,0,0,255,0,1,195,128,1,195,128,1,129,192,3,129,128,1,128,192,3,1,128,1,128,96,6,1,128,1,128,112,14,1,128,1,192,48,12,3,128,0,224,24,24,7,0,0,112,28,56,14,0,0,63,15,240,252,0,127,255,255,255,255,254,127,255,255,255,255,254,96,0,63,252,0,6,96,0,48,12,0,6,96,0,48,12,0,6,96,0,48,12,0,6,96,0,48,12,0,6,96,0,48,12,0,6,96,0,48,12,0,6,127,255,255,255,255,254,127,255,255,255,255,254,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,31,255,255,255,255,248,31,255,255,255,255,248,0,0,0,0,0,0},
16 |   {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,124,0,0,62,0,1,255,0,0,255,128,1,131,128,1,193,128,3,1,192,3,128,192,3,0,224,7,0,192,3,128,112,14,1,192,1,128,48,12,1,128,1,192,24,24,3,128,0,240,12,48,15,0,0,127,255,255,254,0,255,255,255,255,255,255,255,255,255,255,255,255,192,0,48,12,0,3,192,0,48,12,0,3,192,0,48,12,0,3,192,0,48,12,0,3,192,0,48,12,0,3,192,0,48,12,0,3,255,255,255,255,255,255,255,255,255,255,255,255,127,255,255,255,255,254,24,0,48,12,0,24,56,0,48,12,0,24,56,0,48,12,0,28,48,0,48,12,0,28,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,56,0,48,12,0,28,56,0,48,12,0,24,24,0,48,12,0,24,31,255,255,255,255,248,31,255,255,255,255,248,0,0,0,0,0,0},
17 |   {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,254,0,0,127,0,1,255,0,0,255,128,3,131,192,3,193,192,3,0,192,3,0,192,3,0,96,6,0,192,3,0,56,28,0,192,3,128,28,56,1,192,1,254,31,248,127,128,255,255,255,255,255,255,255,255,255,255,255,255,192,0,48,12,0,3,192,0,48,12,0,3,192,0,48,12,0,3,192,0,48,12,0,3,192,0,48,12,0,3,192,0,48,12,0,3,192,0,48,12,0,3,255,255,255,255,255,255,255,255,255,255,255,255,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,63,255,255,255,255,252,31,255,255,255,255,248,0,0,0,0,0,0},
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30 |   {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,63,192,3,252,0,0,255,240,15,255,0,3,192,60,60,3,192,7,0,14,112,0,224,14,0,7,224,0,112,28,0,3,192,0,56,56,0,1,128,0,28,48,0,0,0,0,12,48,0,0,0,0,12,96,0,0,0,0,6,96,0,0,0,0,6,96,0,0,0,0,6,96,0,0,0,0,6,96,0,0,0,0,6,96,0,0,0,0,6,96,0,0,0,0,6,96,0,0,0,0,6,112,0,0,0,0,14,48,0,0,0,0,12,48,0,0,0,0,12,56,0,0,0,0,28,24,0,0,0,0,24,28,0,0,0,0,56,14,0,0,0,0,112,6,0,0,0,0,96,7,0,0,0,0,192,3,128,0,0,1,192,1,192,0,0,3,128,0,224,0,0,7,0,0,112,0,0,14,0,0,60,0,0,60,0,0,14,0,0,112,0,0,7,0,0,224,0,0,3,192,3,192,0,0,0,224,7,0,0,0,0,120,30,0,0,0,0,60,60,0,0,0,0,14,112,0,0,0,0,7,224,0,0,0,0,1,128,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
31 |   {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,7,224,7,224,0,0,31,248,31,248,0,0,124,30,120,62,0,0,224,7,224,7,0,1,192,3,192,3,128,1,128,1,128,1,128,3,0,1,128,0,192,3,0,0,0,0,192,3,0,0,0,0,192,6,0,0,0,0,96,6,0,0,0,0,96,6,0,0,0,0,96,6,0,0,0,0,96,7,0,0,0,0,224,3,0,0,0,0,192,3,0,0,0,0,192,3,128,0,0,1,192,1,128,0,0,1,128,0,192,0,0,3,0,0,224,0,0,7,0,0,112,0,0,14,0,0,56,0,0,28,0,0,28,0,0,56,0,0,14,0,0,112,0,0,7,0,0,224,0,0,3,128,1,192,0,0,0,224,7,0,0,0,0,112,14,0,0,0,0,60,60,0,0,0,0,14,112,0,0,0,0,7,224,0,0,0,0,3,192,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
32 |   {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,254,127,0,0,0,3,207,243,192,0,0,7,3,192,224,0,0,6,1,128,96,0,0,6,1,128,96,0,0,14,0,0,96,0,0,6,0,0,96,0,0,6,0,0,96,0,0,7,0,0,224,0,0,3,0,0,192,0,0,1,128,1,128,0,0,0,192,3,0,0,0,0,96,6,0,0,0,0,48,28,0,0,0,0,28,56,0,0,0,0,14,112,0,0,0,0,7,224,0,0,0,0,3,192,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
33 |   {0,0,0,0,0,0,0,0,0,0,0,0,0,255,0,0,255,0,1,129,192,3,129,192,3,0,112,14,0,64,3,0,24,24,0,192,1,255,255,255,255,128,63,255,255,255,255,252,48,0,63,252,0,12,32,0,16,8,0,4,32,0,16,8,0,4,32,0,16,8,0,4,32,0,16,8,0,4,32,0,16,8,0,4,32,0,16,8,0,4,48,0,24,24,0,12,63,255,255,255,255,252,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,7,255,255,255,255,224,7,255,255,255,255,224,4,0,16,8,0,32,2,0,16,8,0,64,2,0,16,8,0,64,2,0,16,8,0,64,2,0,16,8,0,64,2,0,16,8,0,64,2,0,16,8,0,64,2,0,16,8,0,64,2,0,16,8,0,64,2,0,16,8,0,64,2,0,16,8,0,64,2,0,16,8,0,64,2,0,16,8,0,64,2,0,16,8,0,64,2,0,16,8,0,64,2,0,16,8,0,64,2,0,16,8,0,64,2,0,16,8,0,64,2,0,16,8,0,64,2,0,16,8,0,64,6,0,16,8,0,96,6,0,63,252,0,96,7,255,255,255,255,224,0,0,0,0,0,0},
34 |   {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,254,0,0,127,0,1,255,128,1,255,128,3,129,192,3,129,192,3,0,224,7,0,192,3,0,120,30,0,192,3,128,28,56,1,192,1,255,255,255,255,128,127,255,255,255,255,254,127,255,255,255,255,254,96,0,48,12,0,6,96,0,48,12,0,6,96,0,48,12,0,6,96,0,48,12,0,6,96,0,48,12,0,6,96,0,48,12,0,6,96,0,56,28,0,6,127,255,255,255,255,254,127,255,255,255,255,254,0,0,0,0,0,0,15,255,255,255,255,240,15,255,255,255,255,240,12,0,48,12,0,48,12,0,48,12,0,48,12,0,48,12,0,48,12,0,48,12,0,48,12,0,48,12,0,48,12,0,48,12,0,48,12,0,48,12,0,48,12,0,48,12,0,48,12,0,48,12,0,48,12,0,48,12,0,48,12,0,48,12,0,48,12,0,48,12,0,48,12,0,48,12,0,48,12,0,48,12,0,48,12,0,48,12,0,48,12,0,48,12,0,48,12,0,48,12,0,48,12,0,48,12,0,48,12,0,48,12,0,48,12,0,48,12,0,48,15,255,255,255,255,240,15,255,255,255,255,240,0,0,0,0,0,0},
35 |   {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,254,0,0,127,0,1,255,0,0,255,128,3,131,192,3,193,192,3,0,192,3,0,192,3,0,96,6,0,192,3,0,56,28,0,192,3,128,28,56,1,192,1,254,31,248,127,128,255,255,255,255,255,255,255,255,255,255,255,255,192,0,48,12,0,3,192,0,48,12,0,3,192,0,48,12,0,3,192,0,48,12,0,3,192,0,48,12,0,3,192,0,48,12,0,3,192,0,48,12,0,3,255,255,255,255,255,255,255,255,255,255,255,255,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,63,255,255,255,255,252,31,255,255,255,255,248,0,0,0,0,0,0},
36 |   {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,124,0,0,62,0,1,255,0,0,255,128,1,131,128,1,193,128,3,129,192,3,129,192,3,0,224,7,0,192,3,0,96,6,0,192,1,128,48,12,1,128,1,192,56,28,3,128,0,240,28,56,15,0,0,127,255,255,254,0,255,255,255,255,255,255,255,255,255,255,255,255,192,0,48,12,0,3,192,0,48,12,0,3,192,0,48,12,0,3,192,0,48,12,0,3,192,0,48,12,0,3,192,0,48,12,0,3,255,255,255,255,255,255,255,255,255,255,255,255,127,255,255,255,255,254,24,0,48,12,0,24,56,0,48,12,0,24,56,0,48,12,0,28,48,0,48,12,0,28,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,48,0,48,12,0,12,56,0,48,12,0,28,56,0,48,12,0,24,24,0,48,12,0,24,31,255,255,255,255,248,31,255,255,255,255,248,0,0,0,0,0,0},
37 |   {0,0,0,0,0,0,0,124,0,0,62,0,0,255,0,0,255,0,1,195,128,1,195,128,1,129,192,3,129,128,1,128,192,3,1,128,1,128,96,6,1,128,1,128,112,14,1,128,1,192,48,12,3,128,0,224,24,24,7,0,0,112,28,56,14,0,0,63,15,240,252,0,127,255,255,255,255,254,127,255,255,255,255,254,96,0,63,252,0,6,96,0,48,12,0,6,96,0,48,12,0,6,96,0,48,12,0,6,96,0,48,12,0,6,96,0,48,12,0,6,96,0,48,12,0,6,127,255,255,255,255,254,127,255,255,255,255,254,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,31,255,255,255,255,248,31,255,255,255,255,248,0,0,0,0,0,0},
38 |   {0,0,0,0,0,0,0,124,0,0,62,0,0,255,0,0,255,0,1,195,128,1,195,128,1,129,192,3,129,128,1,128,192,3,1,128,1,128,96,6,1,128,1,128,112,14,1,128,1,192,48,12,3,128,0,224,24,24,7,0,0,112,28,56,14,0,0,63,15,240,252,0,127,255,255,255,255,254,127,255,255,255,255,254,96,0,63,252,0,6,96,0,48,12,0,6,96,0,48,12,0,6,96,0,48,12,0,6,96,0,48,12,0,6,96,0,48,12,0,6,96,0,48,12,0,6,127,255,255,255,255,254,127,255,255,255,255,254,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,31,255,255,255,255,248,31,255,255,255,255,248,0,0,0,0,0,0},
39 |   {0,0,0,0,0,0,0,124,0,0,62,0,0,255,0,0,255,0,1,195,128,1,195,128,1,129,192,3,129,128,1,128,192,3,1,128,1,128,96,6,1,128,1,128,112,14,1,128,1,192,48,12,3,128,0,224,24,24,7,0,0,112,28,56,14,0,0,63,15,240,252,0,127,255,255,255,255,254,127,255,255,255,255,254,96,0,63,252,0,6,96,0,48,12,0,6,96,0,48,12,0,6,96,0,48,12,0,6,96,0,48,12,0,6,96,0,48,12,0,6,96,0,48,12,0,6,127,255,255,255,255,254,127,255,255,255,255,254,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,24,0,48,12,0,24,31,255,255,255,255,248,31,255,255,255,255,248,0,0,0,0,0,0}
40 | };
41 | 
42 | #endif /* __GIFT_H__ */
43 | 


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/happy-birthday/lesson.json:
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1 | {
2 |   "title": "Happy Birthday",
3 |   "files": ["gift.h", "pitches.h"]
4 | }
5 | 


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/happy-birthday/lesson.md:
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 1 | # Happy Birthday, Karin!
 2 | 
 3 | 🎉🎉🎉
 4 | 
 5 | <div style="display: flex; flex-direction: column; align-items: center;">
 6 |   <div>
 7 |     <wokwi-led label="9" color="pink"></wokwi-led>
 8 |     <wokwi-led label="10" color="purple"></wokwi-led>
 9 |     <wokwi-led label="11" color="pink"></wokwi-led>
10 |   </div>
11 |   <wokwi-buzzer pin="6"></wokwi-buzzer>
12 |   <span style="height: 16px"></span>
13 |   <wokwi-ssd1306 i2c-address="0x3d"></wokwi-ssd1306>
14 | </div>
15 | 


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/happy-birthday/pitches.h:
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 1 | /*************************************************
 2 |  * Public Constants
 3 |  *************************************************/
 4 | 
 5 | #define NOTE_B0  31
 6 | #define NOTE_C1  33
 7 | #define NOTE_CS1 35
 8 | #define NOTE_D1  37
 9 | #define NOTE_DS1 39
10 | #define NOTE_E1  41
11 | #define NOTE_F1  44
12 | #define NOTE_FS1 46
13 | #define NOTE_G1  49
14 | #define NOTE_GS1 52
15 | #define NOTE_A1  55
16 | #define NOTE_AS1 58
17 | #define NOTE_B1  62
18 | #define NOTE_C2  65
19 | #define NOTE_CS2 69
20 | #define NOTE_D2  73
21 | #define NOTE_DS2 78
22 | #define NOTE_E2  82
23 | #define NOTE_F2  87
24 | #define NOTE_FS2 93
25 | #define NOTE_G2  98
26 | #define NOTE_GS2 104
27 | #define NOTE_A2  110
28 | #define NOTE_AS2 117
29 | #define NOTE_B2  123
30 | #define NOTE_C3  131
31 | #define NOTE_CS3 139
32 | #define NOTE_D3  147
33 | #define NOTE_DS3 156
34 | #define NOTE_E3  165
35 | #define NOTE_F3  175
36 | #define NOTE_FS3 185
37 | #define NOTE_G3  196
38 | #define NOTE_GS3 208
39 | #define NOTE_A3  220
40 | #define NOTE_AS3 233
41 | #define NOTE_B3  247
42 | #define NOTE_C4  262
43 | #define NOTE_CS4 277
44 | #define NOTE_D4  294
45 | #define NOTE_DS4 311
46 | #define NOTE_E4  330
47 | #define NOTE_F4  349
48 | #define NOTE_FS4 370
49 | #define NOTE_G4  392
50 | #define NOTE_GS4 415
51 | #define NOTE_A4  440
52 | #define NOTE_AS4 466
53 | #define NOTE_B4  494
54 | #define NOTE_C5  523
55 | #define NOTE_CS5 554
56 | #define NOTE_D5  587
57 | #define NOTE_DS5 622
58 | #define NOTE_E5  659
59 | #define NOTE_F5  698
60 | #define NOTE_FS5 740
61 | #define NOTE_G5  784
62 | #define NOTE_GS5 831
63 | #define NOTE_A5  880
64 | #define NOTE_AS5 932
65 | #define NOTE_B5  988
66 | #define NOTE_C6  1047
67 | #define NOTE_CS6 1109
68 | #define NOTE_D6  1175
69 | #define NOTE_DS6 1245
70 | #define NOTE_E6  1319
71 | #define NOTE_F6  1397
72 | #define NOTE_FS6 1480
73 | #define NOTE_G6  1568
74 | #define NOTE_GS6 1661
75 | #define NOTE_A6  1760
76 | #define NOTE_AS6 1865
77 | #define NOTE_B6  1976
78 | #define NOTE_C7  2093
79 | #define NOTE_CS7 2217
80 | #define NOTE_D7  2349
81 | #define NOTE_DS7 2489
82 | #define NOTE_E7  2637
83 | #define NOTE_F7  2794
84 | #define NOTE_FS7 2960
85 | #define NOTE_G7  3136
86 | #define NOTE_GS7 3322
87 | #define NOTE_A7  3520
88 | #define NOTE_AS7 3729
89 | #define NOTE_B7  3951
90 | #define NOTE_C8  4186
91 | #define NOTE_CS8 4435
92 | #define NOTE_D8  4699
93 | #define NOTE_DS8 4978
94 | 


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/happy-birthday/sketch.ino:
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 1 | #include <Adafruit_GFX.h>
 2 | #include <Adafruit_SSD1306.h>
 3 | #include "gift.h"
 4 | #include "pitches.h"
 5 | 
 6 | #define SCREEN_I2C_ADDR 0x3D // or 0x3C
 7 | #define SCREEN_WIDTH 128     // OLED display width, in pixels
 8 | #define SCREEN_HEIGHT 64     // OLED display height, in pixels
 9 | #define OLED_RST_PIN -1      // Reset pin (-1 if not available)
10 | 
11 | Adafruit_SSD1306 display(128, 64, &Wire, OLED_RST_PIN);
12 | 
13 | //notes in the melody
14 | int melody[] = {
15 |   NOTE_C4, NOTE_C4, NOTE_D4, NOTE_C4, NOTE_F4, NOTE_E4, NOTE_C4, NOTE_C4, NOTE_D4, NOTE_C4, NOTE_G4, NOTE_F4, NOTE_C4, NOTE_C4, NOTE_C5, NOTE_A4, NOTE_F4, NOTE_E4, NOTE_D4, NOTE_AS4, NOTE_AS4, NOTE_A4, NOTE_F4, NOTE_G4, NOTE_F4
16 | };
17 | 
18 | //note durations: 4 = quarter note, 8 = eight note, etc.
19 | int noteDurations[] = {
20 |   8, 8, 4, 4, 4, 2, 8, 8, 4, 4, 4, 2, 8, 8, 4, 4, 4, 4, 4, 8, 8, 4, 4, 4, 2,
21 | };
22 | 
23 | int frame = 0;
24 | String message = "Happy Birthday, Karin";
25 | int messageIndex = 0;
26 | 
27 | void drawFrame() {
28 |   display.clearDisplay();
29 |   display.drawBitmap(40, 0, gift_frames[frame], GIFT_FRAME_WIDTH, GIFT_FRAME_HEIGHT, 1);
30 |   display.setCursor(0, 52);
31 |   display.print(message.substring(0, messageIndex));
32 |   display.display();
33 |   frame = (frame + 1) % GIFT_FRAME_COUNT;
34 |   if (frame % 3 == 0) {
35 |     messageIndex = (messageIndex + 1) % 40;
36 |   }
37 | }
38 | 
39 | void setup() {
40 |   display.begin(SSD1306_SWITCHCAPVCC, SCREEN_I2C_ADDR);
41 |   display.setTextColor(SSD1306_WHITE);
42 | 
43 |   pinMode (9, OUTPUT);
44 |   pinMode (10, OUTPUT);
45 |   pinMode (11, OUTPUT);
46 | 
47 |   for (int thisNote = 0 ; thisNote < 25 ; thisNote++) {
48 |     int randomLight1 = random(9, 12);
49 |     int randomLight2 = random(9, 12);
50 |     int randomLight3 = random(9, 12);
51 | 
52 |     digitalWrite (randomLight1, HIGH);
53 |     digitalWrite (randomLight2, HIGH);
54 |     digitalWrite (randomLight3, LOW);
55 | 
56 |     int noteDuration = 1130 / noteDurations[thisNote];
57 |     tone (6, melody[thisNote], noteDuration);
58 |     int pause = noteDuration * 1.275;
59 |     delay (pause);
60 |     noTone(6);
61 | 
62 |     drawFrame();
63 |   }
64 | 
65 |   delay(3000);
66 |   digitalWrite(9, LOW);
67 |   digitalWrite(10, LOW);
68 |   digitalWrite(11, LOW);
69 | }
70 | 
71 | void loop() {
72 |   drawFrame();
73 |   delay(GIFT_FRAME_DELAY);
74 | }
75 | 


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/i2c-scanner/lesson.json:
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1 | {
2 |   "title": "I²C Scanner",
3 |   "thumbnail": "thumbnail.png"
4 | }
5 | 


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/i2c-scanner/lesson.md:
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 1 | # I2C Scanner Playground
 2 | 
 3 | This code sample shows how to scan the I2C bus
 4 | and detect the devices attached to it. In this 
 5 | case we have one I2C LCD screen.
 6 | 
 7 | Click on **"Run code"** to find out which I2C address the screen is attached to!
 8 | 
 9 | <div style="display: flex; flex-wrap: wrap">
10 |   <wokwi-arduino-uno></wokwi-arduino-uno>
11 |   <span style="width: 16px"></span>
12 |   <wokwi-lcd1602></wokwi-lcd1602>
13 | </div>
14 | 


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/i2c-scanner/sketch.ino:
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 1 | // --------------------------------------
 2 | // i2c-scanner
 3 | //
 4 | // This sketch tests the standard 7-bit addresses
 5 | // Devices with higher bit address might not be seen properly.
 6 | // See full version history here: https://gist.github.com/urish/917414da3477e528c8782ee05cd6f557
 7 | 
 8 | #include <Wire.h>
 9 | 
10 | void setup() {
11 |   Wire.begin();
12 | 
13 |   Serial.begin(9600);
14 |   Serial.println("\nI2C Scanner");
15 | }
16 | 
17 | void loop() {
18 |   byte error, address;
19 |   int nDevices;
20 | 
21 |   Serial.println("Scanning...");
22 | 
23 |   nDevices = 0;
24 |   for(address = 1; address < 127; address++) {
25 |     // The i2c-scanner uses the return value of
26 |     // the Write.endTransmisstion to see if
27 |     // a device did acknowledge to the address.
28 |     Wire.beginTransmission(address);
29 |     error = Wire.endTransmission();
30 | 
31 |     if (error == 0)
32 |     {
33 |       Serial.print("I2C device found at address 0x");
34 |       if (address<16) {
35 |         Serial.print("0");
36 |       }
37 |       Serial.print(address,HEX);
38 |       Serial.println("  !");
39 | 
40 |       nDevices++;
41 |     }
42 |     else if (error==4) {
43 |       Serial.print("Unknown error at address 0x");
44 |       if (address<16) {
45 |         Serial.print("0");
46 |       }
47 |       Serial.println(address,HEX);
48 |     }
49 |   }
50 |   if (nDevices == 0) {
51 |     Serial.println("No I2C devices found\n");
52 |   } else {
53 |     Serial.println("done\n");
54 |   }
55 | 
56 |   delay(5000);           // wait 5 seconds for next scan
57 | }
58 | 


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/i2c-scanner/thumbnail.png:
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https://raw.githubusercontent.com/wokwi/wokwi-playgrounds/a4cbf14c128b5dc971ad0a1dc421513075f4e297/i2c-scanner/thumbnail.png


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/keypad/lesson.json:
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1 | {
2 |   "title": "Keypad",
3 |   "thumbnail": "thumbnail.png"
4 | }
5 | 


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/keypad/lesson.md:
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 1 | ## Arduino Keypad Playground
 2 | 
 3 | The rows of the keypad are connected to arduino pins 2, 3, 4, and 5, and
 4 | the columns to pins 6, 7, 8, 9. See below for a full connection table.
 5 | 
 6 | Click "Run code" to see the demo program in action.
 7 | 
 8 | <div style="display:flex; flex-wrap:wrap; align-items: center">
 9 |   <wokwi-membrane-keypad rows="2,3,4,5" cols="6,7,8,9"></wokwi-membrane-keypad>
10 |   <span style="width:16px;"></span>
11 |   <wokwi-arduino-uno></wokwi-arduino-uno>
12 | </div>
13 | 
14 | Pin connection list:
15 | 
16 | | Keypad pin | Arduino Pin |
17 | |------------|-------------|
18 | | R0         | 2           |
19 | | R1         | 3           |
20 | | R2         | 4           |
21 | | R3         | 5           |
22 | | C0         | 6           |
23 | | C1         | 7           |
24 | | C2         | 8           |
25 | | C3         | 9           |
26 | 
27 | 


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/keypad/sketch.ino:
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 1 | #include <Keypad.h>
 2 | 
 3 | const byte ROWS = 4;
 4 | const byte COLS = 4;
 5 | char keys[ROWS][COLS] = {
 6 |   {'1', '2', '3', 'A'},
 7 |   {'4', '5', '6', 'B'},
 8 |   {'7', '8', '9', 'C'},
 9 |   {'*', '0', '#', 'D'}
10 | };
11 | 
12 | byte rowPins[ROWS] = {2, 3, 4, 5}; // Connect to the row pinouts of the keypad
13 | byte colPins[COLS] = {6, 7, 8, 9}; // Connect to the column pinouts of the keypad
14 | 
15 | Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
16 | 
17 | void setup() {
18 |   Serial.begin(9600);
19 | }
20 | 
21 | void loop() {
22 |   char key = keypad.getKey();
23 | 
24 |   if (key != NO_KEY) {
25 |     Serial.println(key);
26 |   }
27 | }
28 | 


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/keypad/thumbnail.png:
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https://raw.githubusercontent.com/wokwi/wokwi-playgrounds/a4cbf14c128b5dc971ad0a1dc421513075f4e297/keypad/thumbnail.png


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/lcd1602-i2c/lesson.json:
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1 | {
2 |   "title": "LCD1602 Playground",
3 |   "thumbnail": "thumbnail.png"
4 | }
5 | 


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/lcd1602-i2c/lesson.md:
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 1 | ## LCD-1602 Arduino Simulation
 2 | 
 3 | The LCD1602 is connected at I²C address `0x27`.
 4 | 
 5 | Click the "Run Code" button on the right to see it in action:
 6 | 
 7 | <wokwi-lcd1602 pins="i2c"></wokwi-lcd1602>
 8 | 
 9 | Can you change the code to print your name?
10 | 


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/lcd1602-i2c/sketch.ino:
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 1 | #include <LiquidCrystal_I2C.h>
 2 | 
 3 | LiquidCrystal_I2C lcd(0x27, 16, 2);
 4 | 
 5 | byte heart[8] = {
 6 |   0b00000,
 7 |   0b01010,
 8 |   0b11111,
 9 |   0b11111,
10 |   0b11111,
11 |   0b01110,
12 |   0b00100,
13 |   0b00000,
14 | };
15 | 
16 | void setup() {
17 |   lcd.init();
18 |   lcd.backlight();
19 |   lcd.createChar(3, heart);
20 |   lcd.setCursor(2, 0);
21 |   lcd.print("I \x03 Arduino \xaf");
22 |   lcd.blink();
23 | }
24 | 
25 | int i = 0;
26 | char *msg = "Hello, World!";
27 | void loop() {
28 |   if (i < strlen(msg)) {
29 |     lcd.setCursor(i + 2, 1);
30 |     lcd.print(msg[i]);
31 |     i++;
32 |   }
33 |   delay(200);
34 | }
35 | 


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/lcd1602-i2c/thumbnail.png:
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https://raw.githubusercontent.com/wokwi/wokwi-playgrounds/a4cbf14c128b5dc971ad0a1dc421513075f4e297/lcd1602-i2c/thumbnail.png


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/lcd1602/lesson.json:
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1 | {
2 |   "title": "LCD1602 Playground",
3 |   "thumbnail": "../lcd1602-i2c/thumbnail.png"
4 | }
5 | 


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/lcd1602/lesson.md:
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 1 | ## LiquidCrystal LCD-1602 Simulation
 2 | 
 3 | The LCD1602 display is connected to pins 12, 11, 2, 3, 4, and 5
 4 | of the Arduino.
 5 | 
 6 | Click the "Run Code" button on the right to see it in action:
 7 | 
 8 | <wokwi-lcd1602 pinList="rs:12 enable:11 d7:2 d6:3 d5:4 d4:5"></wokwi-lcd1602>
 9 | 
10 | Can you change the code to print your name?
11 | 
12 | Pin connection list:
13 | 
14 | | LCD1602 Pin | Arduino Pin |
15 | |-------------|-------------|
16 | | RS          | 12          |
17 | | ENABLE      | 11          |
18 | | D7          | 2           |
19 | | D6          | 3           |
20 | | D5          | 4           |
21 | | D4          | 5           |
22 | 
23 | 


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/lcd1602/sketch.ino:
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 1 | /*
 2 |  LiquidCrystal Library - Hello World
 3 | 
 4 |  Demonstrates the use a 16x2 LCD display.  The LiquidCrystal
 5 |  library works with all LCD displays that are compatible with the
 6 |  Hitachi HD44780 driver. There are many of them out there, and you
 7 |  can usually tell them by the 16-pin interface.
 8 |  */
 9 | 
10 | // include the library code:
11 | #include <LiquidCrystal.h>
12 | 
13 | // initialize the library with the numbers of the interface pins
14 | LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
15 | 
16 | void setup() {
17 |   // set up the LCD's number of columns and rows:
18 |   lcd.begin(16, 2);
19 |   // Print a message to the LCD.
20 |   lcd.print("hello, world!");
21 | }
22 | 
23 | void loop() {
24 |   // set the cursor to column 0, line 1
25 |   // (note: line 1 is the second row, since counting begins with 0):
26 |   lcd.setCursor(0, 1);
27 |   // print the number of seconds since reset:
28 |   lcd.print(millis() / 1000);
29 | }
30 | 


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/neopixel-matrix/lesson.json:
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1 | {
2 |   "title": "NeoPixel Matrix",
3 |   "thumbnail": "thumbnail.png"
4 | }
5 | 


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/neopixel-matrix/lesson.md:
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 1 | ## NeoPixel Matrix
 2 | 
 3 | This 16x16 NeoPixel matrix is connected to Arduino's digital pin number 3.
 4 | It has total of 256 LEDs.
 5 | 
 6 | Click the "Run Code" button on the right to see it in action:
 7 | 
 8 | <span style="background: #333; padding: 4px; display: inline-block">
 9 |   <wokwi-neopixel-matrix pin="3" cols="16" rows="16"></wokwi-neopixel-matrix>
10 | </span>
11 | 
12 | <p>
13 | <small>
14 |   Curious to know how the simulation works? 
15 |   <a href="https://blog.wokwi.com/avr8js-simulate-arduino-in-javascript/?utm_source=wokwi&amp;utm_campaign=neopixel-matrix" target="_blank">We've got you covered!</a>
16 | </small>
17 | </p>
18 | 


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/neopixel-matrix/sketch.ino:
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 1 | #include "FastLED.h"
 2 | 
 3 | // Matrix size
 4 | #define NUM_ROWS 16
 5 | #define NUM_COLS 16
 6 | 
 7 | // LEDs pin
 8 | #define DATA_PIN 3
 9 | 
10 | // LED brightness
11 | #define BRIGHTNESS 180
12 | 
13 | #define NUM_LEDS NUM_ROWS * NUM_COLS
14 | 
15 | // Define the array of leds
16 | CRGB leds[NUM_LEDS];
17 | 
18 | void setup() {
19 |   FastLED.addLeds<NEOPIXEL, DATA_PIN>(leds, NUM_LEDS);
20 |   FastLED.setBrightness(BRIGHTNESS);
21 | }
22 | 
23 | int counter = 0;
24 | void loop() {
25 |   for (byte row = 0; row < NUM_ROWS; row++) {
26 |     for (byte col = 0; col < NUM_COLS; col++) {
27 |       int delta = abs(NUM_ROWS - row * 2) + abs(NUM_COLS - col * 2);
28 |       leds[row * NUM_COLS + col] = CHSV(delta * 4 + counter, 255, 255);
29 |     }
30 |   }
31 |   FastLED.show();
32 |   delay(5);
33 |   counter++;
34 | }
35 | 


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/neopixel-matrix/thumbnail.png:
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https://raw.githubusercontent.com/wokwi/wokwi-playgrounds/a4cbf14c128b5dc971ad0a1dc421513075f4e297/neopixel-matrix/thumbnail.png


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/neopixel-strip/lesson.json:
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1 | {
2 |   "title": "NeoPixel Strip",
3 |   "thumbnail": "thumbnail.png"
4 | }
5 | 


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/neopixel-strip/lesson.md:
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 1 | ## NeoPixel Strip
 2 | 
 3 | The NeoPixel strip is connected to Arduino pin 6. 
 4 | Click the "Run Code" button on the right to see it in action:
 5 | 
 6 | <span style="background: #060; padding: 4px 4px 0;">
 7 |   <wokwi-neopixel pin="6" pixel="0"></wokwi-neopixel>
 8 |   <wokwi-neopixel pin="6" pixel="1"></wokwi-neopixel>
 9 |   <wokwi-neopixel pin="6" pixel="2"></wokwi-neopixel>
10 |   <wokwi-neopixel pin="6" pixel="3"></wokwi-neopixel>
11 |   <wokwi-neopixel pin="6" pixel="4"></wokwi-neopixel>
12 |   <wokwi-neopixel pin="6" pixel="5"></wokwi-neopixel>
13 |   <wokwi-neopixel pin="6" pixel="6"></wokwi-neopixel>
14 |   <wokwi-neopixel pin="6" pixel="7"></wokwi-neopixel>
15 | </span>
16 | 


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/neopixel-strip/sketch.ino:
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 1 | #include <Adafruit_NeoPixel.h>
 2 | 
 3 | #define PIN        6
 4 | #define NUMPIXELS  8
 5 | 
 6 | Adafruit_NeoPixel pixels(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);
 7 | 
 8 | void setup() {
 9 |   pixels.begin();
10 | }
11 | 
12 | int r = 150;
13 | int g = 0;
14 | int b = 0;
15 | 
16 | void loop() {
17 |   pixels.clear();
18 | 
19 |   for(int i=0; i<NUMPIXELS; i++) {
20 |     pixels.setPixelColor(i, r, g, b);
21 |     pixels.show();
22 |     delay(200);
23 |   }
24 | 
25 |   int temp = b;
26 |   b = g;
27 |   g = r;
28 |   r = temp;
29 | }
30 | 


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/neopixel-strip/thumbnail.png:
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https://raw.githubusercontent.com/wokwi/wokwi-playgrounds/a4cbf14c128b5dc971ad0a1dc421513075f4e297/neopixel-strip/thumbnail.png


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/potentiometer/lesson.json:
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1 | {
2 |   "title": "Potentiometer",
3 |   "thumbnail": "thumbnail.png"
4 | }
5 | 


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/potentiometer/lesson.md:
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 1 | # Potentiometer Playground
 2 | 
 3 | The potentiometer is connected to Analog pin **`A0`**, and the LED
 4 | to pin **`11`**. Rotating the potentiometer will change the blink
 5 | rate of the LED:
 6 | 
 7 | <wokwi-potentiometer pin="A0" value="511"></wokwi-potentiometer>
 8 | <wokwi-led label="11" color="red"></wokwi-led>
 9 | 
10 | Can you make the potentiometer control the brightness of the LED instead?
11 | 


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/potentiometer/sketch.ino:
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 1 | /* Potentiometer controlled LED Blink */
 2 | 
 3 | void setup() {
 4 |   pinMode(A0, INPUT);
 5 |   pinMode(11, OUTPUT);
 6 | }
 7 | 
 8 | void loop() {
 9 |   digitalWrite(11, HIGH);
10 |   delayPotentiometer();
11 |   digitalWrite(11, LOW);
12 |   delayPotentiometer();
13 | }
14 | 
15 | int delayValue() {
16 |   int value = analogRead(A0);
17 |   return map(value, 0, 1023, 100, 1000);
18 | }
19 | 
20 | void delayPotentiometer() {
21 |   for (int i = 0; i < delayValue(); i++) {
22 |     delay(1);
23 |   }
24 | }
25 | 


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/potentiometer/thumbnail.png:
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https://raw.githubusercontent.com/wokwi/wokwi-playgrounds/a4cbf14c128b5dc971ad0a1dc421513075f4e297/potentiometer/thumbnail.png


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/rotary-dialer/lesson.json:
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1 | {
2 |   "title": "Rotary Dialer",
3 |   "thumbnail": "thumbnail.png"
4 | }
5 | 


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/rotary-dialer/lesson.md:
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1 | # Vintage Dial Phone for Arduino
2 | 
3 | Click on "Run code" to start the simulation.
4 | 
5 | <wokwi-rotary-dialer pinList="dial:3 pulse:2"></wokwi-rotary-dialer> <br/>
6 | <wokwi-lcd1602 pinList="rs:12 enable:11 d7:7 d6:8 d5:9 d4:10"></wokwi-lcd1602>
7 | 
8 | Rotary dialer by Liron Hazan, code by talofer99.
9 | 


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/rotary-dialer/sketch.ino:
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 1 | // Include the library code:
 2 | #include <LiquidCrystal.h>
 3 | 
 4 | // Initialize the library with the numbers of the interface pins
 5 | LiquidCrystal lcd(12, 11, 10, 9, 8, 7);
 6 | #define INDIALPIN 3
 7 | #define PULSEPIN 2
 8 | boolean inDialPinLastState;
 9 | boolean pulsPinLastState;
10 | byte counter = 0;
11 | 
12 | void setup() {
13 |   Serial.begin(115200);
14 |   Serial.println("System started");
15 |   // set up the LCD's number of columns and rows:
16 |   lcd.begin(16, 2);
17 |   // set the fixed text
18 |   lcd.setCursor(0, 0);
19 |   pinMode(INDIALPIN, INPUT_PULLUP);
20 |   pinMode(PULSEPIN, INPUT_PULLUP);
21 |   inDialPinLastState = digitalRead(INDIALPIN);
22 |   pulsPinLastState = digitalRead(PULSEPIN);
23 | }
24 | 
25 | void loop() {
26 |   boolean inDialPinState = digitalRead(INDIALPIN);
27 |   boolean pulsPinState = digitalRead(PULSEPIN);
28 |   if (inDialPinState != inDialPinLastState) {
29 |     if (!inDialPinState) {
30 |       Serial.println("Start of dial");
31 |       counter = 0;
32 |     } else {
33 |       Serial.println("End of dial");
34 |       Serial.print("Dialed Digit - ");
35 |       Serial.println(counter);
36 |       if (counter) {
37 |         counter = counter % 10;
38 |         lcd.print(counter);
39 |       }
40 |     } //end if
41 |     inDialPinLastState = inDialPinState;
42 |   } //end if
43 |   if (pulsPinLastState != pulsPinState) {
44 |     if (!pulsPinLastState) {
45 |       counter++;
46 |     } // end if
47 |     Serial.println("pulsPinState - " + String(pulsPinState));
48 |     pulsPinLastState = pulsPinState;
49 |   }
50 | }
51 | 


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/rotary-dialer/thumbnail.png:
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https://raw.githubusercontent.com/wokwi/wokwi-playgrounds/a4cbf14c128b5dc971ad0a1dc421513075f4e297/rotary-dialer/thumbnail.png


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/serial/lesson.json:
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1 | {
2 |   "title": "Serial Monitor",
3 |   "thumbnail": "thumbnail.png"
4 | }
5 | 


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/serial/lesson.md:
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 1 | ## Arduino Serial Monitor Playground
 2 | 
 3 | This is the perfect place to paste some Arduino code, run it and see the output. 
 4 | 
 5 | Click <strong>Run Code</strong> to compile, and you will see the "Serial Monitor" with
 6 | all the prints from the code.
 7 | 
 8 | <wokwi-arduino-uno></wokwi-arduino-uno>
 9 | 
10 | <small>Built with <span style="color:red">♥</span> for the Arduino community.</small>
11 | 


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/serial/serial.svg:
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  1 | <?xml version="1.0" encoding="UTF-8" standalone="no"?>
  2 | <svg
  3 |    xmlns:dc="http://purl.org/dc/elements/1.1/"
  4 |    xmlns:cc="http://creativecommons.org/ns#"
  5 |    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
  6 |    xmlns:svg="http://www.w3.org/2000/svg"
  7 |    xmlns="http://www.w3.org/2000/svg"
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211 |    style="fill:#a31515;fill-opacity:1"
212 |    id="tspan3533">&quot;Hello, World!&quot;</tspan></tspan><tspan
213 |        sodipodi:role="line"
214 |        x="131.4387"
215 |        y="148.0563"
216 |        style="font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;font-family:Consolas;-inkscape-font-specification:Consolas;stroke-width:0.3198806"
217 |        id="tspan3519">);</tspan></text>
218 |   <path
219 |      id="path3535"
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221 |      inkscape:connector-curvature="0"
222 |      style="fill:#ffffff;stroke-width:0.0225914" />
223 | </svg>
224 | 


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/serial/sketch.ino:
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 1 | void setup() {
 2 |   Serial.begin(115200);
 3 |   Serial.println("Welcome to the Serial Playground!");
 4 |   Serial.println("---------------------------------");
 5 | }
 6 | 
 7 | byte value = 0;
 8 | void loop() {
 9 |   Serial.print("Counter: ");
10 |   Serial.print(value);
11 |   Serial.print(", hex: ");
12 |   Serial.println(value, HEX);
13 |   value += 1;
14 |   delay(500);
15 | }
16 | 


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/serial/thumbnail.png:
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https://raw.githubusercontent.com/wokwi/wokwi-playgrounds/a4cbf14c128b5dc971ad0a1dc421513075f4e297/serial/thumbnail.png


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/servo/lesson.json:
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1 | { "title": "Servo", "thumbnail": "thumbnail.png" }
2 | 


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/servo/lesson.md:
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 1 | # Servo
 2 | 
 3 | This is a simple demo of a servo controlled by Arduino.
 4 | 
 5 | The servo is connected to Arduino pin number 9. Click on
 6 | <strong>Run Code</strong> to start the simulation:
 7 | 
 8 | <wokwi-servo pin="9"></wokwi-servo>
 9 | 
10 | <wokwi-arduino-uno></wokwi-arduino-uno>
11 | 


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/servo/sketch.ino:
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 1 | #include <Servo.h>
 2 | 
 3 | Servo myservo;
 4 | 
 5 | void setup() {
 6 |   myservo.attach(9);
 7 | }
 8 | 
 9 | void loop() {
10 |   for (int pos = 0; pos <= 180; pos += 1) {
11 |     myservo.write(pos);
12 |     delay(15);
13 |   }
14 |   for (int pos = 180; pos >= 0; pos -= 1) {
15 |     myservo.write(pos);
16 |     delay(15);
17 |   }
18 | }
19 | 


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/servo/thumbnail.png:
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https://raw.githubusercontent.com/wokwi/wokwi-playgrounds/a4cbf14c128b5dc971ad0a1dc421513075f4e297/servo/thumbnail.png


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/seven-segment-clock/lesson.json:
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1 | {
2 |   "title": "7 Segment Clock",
3 |   "thumbnail": "thumbnail.png"
4 | }
5 | 


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/seven-segment-clock/lesson.md:
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1 | # Arduino Seven Segment Clock
2 | 
3 | A simple 7-segment clock / stopwatch that counts minutes and seconds:
4 | 
5 | <wokwi-7segment color="#00ff00" connections="anode:2,3,4,5:6,7,8,9,10,11,12,13" digits="4"></wokwi-7segment>
6 | 
7 | <wokwi-arduino-uno></wokwi-arduino-uno>
8 | 


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/seven-segment-clock/sketch.ino:
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 1 | /**
 2 |  * Simple 7-Segment Timer Counter (Minutes and Second).
 3 |  *
 4 |  * Drives four-segment displays, with common ANODEs connected
 5 |  * at pins 2, 3, 4, and 5, and segment lines at pins 6-13.
 6 |  * Enjoy ;-)
 7 |  */
 8 | 
 9 | #include <SevSeg.h>
10 | 
11 | SevSeg sevseg;
12 | 
13 | void setup() {
14 |   byte digits = 4;
15 |   byte digitPins[] = {2, 3, 4, 5};
16 |   byte segmentPins[] = {6, 7, 8, 9, 10, 11, 12, 13};
17 |   bool resistorsOnSegments = false;
18 |   byte hardwareConfig = COMMON_ANODE;
19 |   bool updateWithDelays = false;
20 |   bool leadingZeros = true;
21 |   bool disableDecPoint = false;
22 |   sevseg.begin(hardwareConfig, digits, digitPins, segmentPins, resistorsOnSegments,
23 |                updateWithDelays, leadingZeros, disableDecPoint);
24 |   sevseg.setBrightness(90);
25 | }
26 | 
27 | int seconds = 0;
28 | int minutes = 0;
29 | unsigned long lastMillis = 0;
30 | 
31 | void loop() {
32 |   if (millis() - lastMillis >= 1000) {
33 |     lastMillis = millis();
34 |     seconds++;
35 |     if (seconds == 60) {
36 |       seconds = 0;
37 |       minutes++;
38 |       if (minutes == 60) {
39 |         minutes = 0;
40 |       }
41 |     }
42 |     sevseg.setNumber(minutes * 100 + seconds, 2);
43 |   }
44 | 
45 |   sevseg.refreshDisplay();
46 | }
47 | 


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/seven-segment-clock/thumbnail.png:
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https://raw.githubusercontent.com/wokwi/wokwi-playgrounds/a4cbf14c128b5dc971ad0a1dc421513075f4e297/seven-segment-clock/thumbnail.png


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/simon-game/lesson.json:
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1 | {
2 |   "title": "Simon Game",
3 |   "thumbnail": "thumbnail.png",
4 |   "files": ["pitches.h"]
5 | }
6 | 


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/simon-game/lesson.md:
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 1 | # Simon Game Playground
 2 | 
 3 | Simon Memory Game for Arduino with Sound 🎶
 4 | 
 5 | Click the **Run Code** button to see it in action:
 6 | 
 7 | <div style="display: inline-grid; grid-template-columns: 1fr 1fr 1fr">
 8 |   <!-- top -->
 9 |   <div>
10 |     <wokwi-led color="yellow" label="9"></wokwi-led>
11 |     <wokwi-pushbutton color="yellow" pin="2"></wokwi-pushbutton>
12 |   </div>
13 |   <div></div>
14 |   <div>
15 |     <wokwi-led color="blue" label="10"></wokwi-led>
16 |     <wokwi-pushbutton color="blue" pin="3"></wokwi-pushbutton>
17 |   </div>
18 |   <!-- center -->
19 |   <div></div>
20 |   <div style="text-align: center; position: relative; top: -16px; left: 5px;">
21 |     <wokwi-buzzer pin="8"></wokwi-buzzer>
22 |   </div>
23 |   <div></div>
24 |   <!-- bottom -->
25 |   <div>
26 |     <wokwi-led color="green" label="11"></wokwi-led>
27 |     <wokwi-pushbutton color="green" pin="4"></wokwi-pushbutton>
28 |   </div>
29 |   <div></div>
30 |   <div>
31 |     <wokwi-led color="red" label="12"></wokwi-led>
32 |     <wokwi-pushbutton color="red" pin="5"></wokwi-pushbutton>
33 |   </div>
34 | </div>
35 | 


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/simon-game/pitches.h:
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 1 | /*************************************************
 2 |  * Public Constants
 3 |  *************************************************/
 4 | 
 5 | #define NOTE_B0  31
 6 | #define NOTE_C1  33
 7 | #define NOTE_CS1 35
 8 | #define NOTE_D1  37
 9 | #define NOTE_DS1 39
10 | #define NOTE_E1  41
11 | #define NOTE_F1  44
12 | #define NOTE_FS1 46
13 | #define NOTE_G1  49
14 | #define NOTE_GS1 52
15 | #define NOTE_A1  55
16 | #define NOTE_AS1 58
17 | #define NOTE_B1  62
18 | #define NOTE_C2  65
19 | #define NOTE_CS2 69
20 | #define NOTE_D2  73
21 | #define NOTE_DS2 78
22 | #define NOTE_E2  82
23 | #define NOTE_F2  87
24 | #define NOTE_FS2 93
25 | #define NOTE_G2  98
26 | #define NOTE_GS2 104
27 | #define NOTE_A2  110
28 | #define NOTE_AS2 117
29 | #define NOTE_B2  123
30 | #define NOTE_C3  131
31 | #define NOTE_CS3 139
32 | #define NOTE_D3  147
33 | #define NOTE_DS3 156
34 | #define NOTE_E3  165
35 | #define NOTE_F3  175
36 | #define NOTE_FS3 185
37 | #define NOTE_G3  196
38 | #define NOTE_GS3 208
39 | #define NOTE_A3  220
40 | #define NOTE_AS3 233
41 | #define NOTE_B3  247
42 | #define NOTE_C4  262
43 | #define NOTE_CS4 277
44 | #define NOTE_D4  294
45 | #define NOTE_DS4 311
46 | #define NOTE_E4  330
47 | #define NOTE_F4  349
48 | #define NOTE_FS4 370
49 | #define NOTE_G4  392
50 | #define NOTE_GS4 415
51 | #define NOTE_A4  440
52 | #define NOTE_AS4 466
53 | #define NOTE_B4  494
54 | #define NOTE_C5  523
55 | #define NOTE_CS5 554
56 | #define NOTE_D5  587
57 | #define NOTE_DS5 622
58 | #define NOTE_E5  659
59 | #define NOTE_F5  698
60 | #define NOTE_FS5 740
61 | #define NOTE_G5  784
62 | #define NOTE_GS5 831
63 | #define NOTE_A5  880
64 | #define NOTE_AS5 932
65 | #define NOTE_B5  988
66 | #define NOTE_C6  1047
67 | #define NOTE_CS6 1109
68 | #define NOTE_D6  1175
69 | #define NOTE_DS6 1245
70 | #define NOTE_E6  1319
71 | #define NOTE_F6  1397
72 | #define NOTE_FS6 1480
73 | #define NOTE_G6  1568
74 | #define NOTE_GS6 1661
75 | #define NOTE_A6  1760
76 | #define NOTE_AS6 1865
77 | #define NOTE_B6  1976
78 | #define NOTE_C7  2093
79 | #define NOTE_CS7 2217
80 | #define NOTE_D7  2349
81 | #define NOTE_DS7 2489
82 | #define NOTE_E7  2637
83 | #define NOTE_F7  2794
84 | #define NOTE_FS7 2960
85 | #define NOTE_G7  3136
86 | #define NOTE_GS7 3322
87 | #define NOTE_A7  3520
88 | #define NOTE_AS7 3729
89 | #define NOTE_B7  3951
90 | #define NOTE_C8  4186
91 | #define NOTE_CS8 4435
92 | #define NOTE_D8  4699
93 | #define NOTE_DS8 4978
94 | 


--------------------------------------------------------------------------------
/simon-game/sketch.ino:
--------------------------------------------------------------------------------
  1 | /**
  2 |    Simon Game for Arduino
  3 | 
  4 |    Copyright (C) 2016, Uri Shaked
  5 | 
  6 |    Released under the MIT License.
  7 | */
  8 | 
  9 | #include "pitches.h"
 10 | 
 11 | /* Constants - define pin numbers for LEDs,
 12 |    buttons and speaker, and also the game tones: */
 13 | const byte ledPins[] = {9, 10, 11, 12};
 14 | const byte buttonPins[] = {2, 3, 4, 5};
 15 | #define SPEAKER_PIN 8
 16 | 
 17 | #define MAX_GAME_LENGTH 100
 18 | 
 19 | const int gameTones[] = { NOTE_G3, NOTE_C4, NOTE_E4, NOTE_G5};
 20 | 
 21 | /* Global variales - store the game state */
 22 | byte gameSequence[MAX_GAME_LENGTH] = {0};
 23 | byte gameIndex = 0;
 24 | 
 25 | /**
 26 |    Set up the Arduino board and initialize Serial communication
 27 | */
 28 | void setup() {
 29 |   Serial.begin(9600);
 30 |   for (byte i = 0; i < 4; i++) {
 31 |     pinMode(ledPins[i], OUTPUT);
 32 |     pinMode(buttonPins[i], INPUT_PULLUP);
 33 |   }
 34 |   pinMode(SPEAKER_PIN, OUTPUT);
 35 |   // The following line primes the random number generator.
 36 |   // It assumes pin A0 is floating (disconnected):
 37 |   randomSeed(analogRead(A0));
 38 | }
 39 | 
 40 | /**
 41 |    Lights the given LED and plays the suitable tone
 42 | */
 43 | void lightLedAndPlayTone(byte ledIndex) {
 44 |   digitalWrite(ledPins[ledIndex], HIGH);
 45 |   tone(SPEAKER_PIN, gameTones[ledIndex]);
 46 |   delay(300);
 47 |   digitalWrite(ledPins[ledIndex], LOW);
 48 |   noTone(SPEAKER_PIN);
 49 | }
 50 | 
 51 | /**
 52 |    Plays the current sequence of notes that the user has to repeat
 53 | */
 54 | void playSequence() {
 55 |   for (int i = 0; i < gameIndex; i++) {
 56 |     byte currentLed = gameSequence[i];
 57 |     lightLedAndPlayTone(currentLed);
 58 |     delay(50);
 59 |   }
 60 | }
 61 | 
 62 | /**
 63 |     Waits until the user pressed one of the buttons,
 64 |     and returns the index of that button
 65 | */
 66 | byte readButtons() {
 67 |   while (true) {
 68 |     for (byte i = 0; i < 4; i++) {
 69 |       byte buttonPin = buttonPins[i];
 70 |       if (digitalRead(buttonPin) == LOW) {
 71 |         return i;
 72 |       }
 73 |     }
 74 |     delay(1);
 75 |   }
 76 | }
 77 | 
 78 | /**
 79 |   Play the game over sequence, and report the game score
 80 | */
 81 | void gameOver() {
 82 |   Serial.print("Game over! your score: ");
 83 |   Serial.println(gameIndex - 1);
 84 |   gameIndex = 0;
 85 |   delay(200);
 86 | 
 87 |   // Play a Wah-Wah-Wah-Wah sound
 88 |   tone(SPEAKER_PIN, NOTE_DS5);
 89 |   delay(300);
 90 |   tone(SPEAKER_PIN, NOTE_D5);
 91 |   delay(300);
 92 |   tone(SPEAKER_PIN, NOTE_CS5);
 93 |   delay(300);
 94 |   for (byte i = 0; i < 10; i++) {
 95 |     for (int pitch = -10; pitch <= 10; pitch++) {
 96 |       tone(SPEAKER_PIN, NOTE_C5 + pitch);
 97 |       delay(5);
 98 |     }
 99 |   }
100 |   noTone(SPEAKER_PIN);
101 |   delay(500);
102 | }
103 | 
104 | /**
105 |    Get the user's input and compare it with the expected sequence.
106 | */
107 | bool checkUserSequence() {
108 |   for (int i = 0; i < gameIndex; i++) {
109 |     byte expectedButton = gameSequence[i];
110 |     byte actualButton = readButtons();
111 |     lightLedAndPlayTone(actualButton);
112 |     if (expectedButton != actualButton) {
113 |       return false;
114 |     }
115 |   }
116 | 
117 |   return true;
118 | }
119 | 
120 | /**
121 |    Plays an hooray sound whenever the user finishes a level
122 | */
123 | void playLevelUpSound() {
124 |   tone(SPEAKER_PIN, NOTE_E4);
125 |   delay(150);
126 |   tone(SPEAKER_PIN, NOTE_G4);
127 |   delay(150);
128 |   tone(SPEAKER_PIN, NOTE_E5);
129 |   delay(150);
130 |   tone(SPEAKER_PIN, NOTE_C5);
131 |   delay(150);
132 |   tone(SPEAKER_PIN, NOTE_D5);
133 |   delay(150);
134 |   tone(SPEAKER_PIN, NOTE_G5);
135 |   delay(150);
136 |   noTone(SPEAKER_PIN);
137 | }
138 | 
139 | /**
140 |    The main game loop
141 | */
142 | void loop() {
143 |   // Add a random color to the end of the sequence
144 |   gameSequence[gameIndex] = random(0, 4);
145 |   gameIndex++;
146 |   if (gameIndex >= MAX_GAME_LENGTH) {
147 |     gameIndex = MAX_GAME_LENGTH - 1;
148 |   }
149 | 
150 |   playSequence();
151 |   if (!checkUserSequence()) {
152 |     gameOver();
153 |   }
154 | 
155 |   delay(300);
156 | 
157 |   if (gameIndex > 0) {
158 |     playLevelUpSound();
159 |     delay(300);
160 |   }
161 | }
162 | 


--------------------------------------------------------------------------------
/simon-game/thumbnail.png:
--------------------------------------------------------------------------------
https://raw.githubusercontent.com/wokwi/wokwi-playgrounds/a4cbf14c128b5dc971ad0a1dc421513075f4e297/simon-game/thumbnail.png


--------------------------------------------------------------------------------
/spaceship-game/lesson.json:
--------------------------------------------------------------------------------
1 | {
2 |   "title": "Spaceship Game",
3 |   "thumbnail": "thumbnail.png"
4 | }
5 | 


--------------------------------------------------------------------------------
/spaceship-game/lesson.md:
--------------------------------------------------------------------------------
 1 | Spaceship Game from <a href="https://youtu.be/lOz_GuME63E" target="_blank">Volos Projects</a>
 2 | 
 3 | Click the **Run Code** button on the right to see it in action:
 4 | 
 5 | <div style="display:flex">
 6 |   <div style="display: flex; flex-direction: column">
 7 |     <wokwi-pushbutton pin="12" color="gray"></wokwi-pushbutton>
 8 |     <wokwi-pushbutton pin="11" color="gray"></wokwi-pushbutton>
 9 |     <wokwi-pushbutton pin="3" color="red"></wokwi-pushbutton>
10 |   </div>
11 |   <wokwi-ssd1306 address="0x3c"></wokwi-ssd1306>
12 |   <wokwi-buzzer pin="9"></wokwi-buzzer>
13 | </div>
14 | 


--------------------------------------------------------------------------------
/spaceship-game/sketch.ino:
--------------------------------------------------------------------------------
  1 | // Game from: Volos Projects (https://youtu.be/lOz_GuME63E)
  2 | 
  3 | /*********************************************************************
  4 |   This is an example for our Monochrome OLEDs based on SSD1306 drivers
  5 | 
  6 |   Pick one up today in the adafruit shop!
  7 |   ------> http://www.adafruit.com/category/63_98
  8 | 
  9 |   This example is for a 128x32 size display using I2C to communicate
 10 |   3 pins are required to interface (2 I2C and one reset)
 11 | 
 12 |   Adafruit invests time and resources providing this open source code,
 13 |   please support Adafruit and open-source hardware by purchasing
 14 |   products from Adafruit!
 15 | 
 16 |   Written by Limor Fried/Ladyada  for Adafruit Industries.
 17 |   BSD license, check license.txt for more information
 18 |   All text above, and the splash screen must be included in any redistribution
 19 | *********************************************************************/
 20 | 
 21 | #include <SPI.h>
 22 | #include <Wire.h>
 23 | #include <Adafruit_GFX.h>
 24 | #include <Adafruit_SSD1306.h>
 25 | #include <Fonts/FreeSans9pt7b.h>
 26 | //#include <Fonts/FreeSans12pt7b.h>
 27 | 
 28 | Adafruit_SSD1306 display(128, 64);
 29 | 
 30 | 
 31 | 
 32 | 
 33 | 
 34 | 
 35 | const int c = 261;
 36 | const int d = 294;
 37 | const int e = 329;
 38 | const int f = 349;
 39 | const int g = 391;
 40 | const int gS = 415;
 41 | const int a = 440;
 42 | const int aS = 455;
 43 | const int b = 466;
 44 | const int cH = 523;
 45 | const int cSH = 554;
 46 | const int dH = 587;
 47 | const int dSH = 622;
 48 | const int eH = 659;
 49 | const int fH = 698;
 50 | const int fSH = 740;
 51 | const int gH = 784;
 52 | const int gSH = 830;
 53 | const int aH = 880;
 54 | 
 55 | const unsigned char PROGMEM dioda16 [] = {
 56 | 
 57 |   0x00, 0x00, 0x00, 0x00, 0x1C, 0x00, 0x3F, 0xF0, 0x3C, 0x00, 0x3C, 0x00, 0xFF, 0x00, 0x7F, 0xFF,
 58 |   0x7F, 0xFF, 0xFF, 0x00, 0x3C, 0x00, 0x3C, 0x00, 0x1F, 0xF0, 0x1C, 0x00, 0x00, 0x00, 0x00, 0x00
 59 | 
 60 | };
 61 | 
 62 | const unsigned char PROGMEM storm [] = {
 63 |   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
 64 |   0x00, 0x00, 0x00, 0x00, 0x7F, 0xFE, 0x00, 0x00, 0x00, 0x07, 0x80, 0x01, 0xE0, 0x00, 0x00, 0x0C,
 65 |   0x00, 0x00, 0x20, 0x00, 0x00, 0x18, 0x00, 0x00, 0x18, 0x00, 0x00, 0x30, 0x00, 0x00, 0x04, 0x00,
 66 |   0x00, 0x20, 0x00, 0x00, 0x04, 0x00, 0x00, 0x20, 0x00, 0x00, 0x04, 0x00, 0x00, 0x60, 0x00, 0x00,
 67 |   0x02, 0x00, 0x00, 0x40, 0x00, 0x00, 0x02, 0x00, 0x00, 0x40, 0x00, 0x00, 0x01, 0x00, 0x00, 0x40,
 68 |   0x00, 0x00, 0x01, 0x00, 0x00, 0x40, 0x00, 0x00, 0x01, 0x00, 0x00, 0x7F, 0xE0, 0x00, 0x01, 0x00,
 69 |   0x00, 0x7F, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0x7F, 0xFF, 0xFF, 0xFF, 0x00, 0x00, 0xD7, 0xFF, 0xFF,
 70 |   0xE1, 0x00, 0x01, 0xBF, 0xFC, 0x1F, 0xFA, 0x80, 0x01, 0xBF, 0xF1, 0xCF, 0xFA, 0x80, 0x01, 0x3F,
 71 |   0xC2, 0x37, 0xF7, 0x80, 0x01, 0xEF, 0x9C, 0x01, 0xE7, 0xC0, 0x01, 0xE0, 0x70, 0x06, 0x06, 0x80,
 72 |   0x01, 0xE0, 0xC0, 0x03, 0x06, 0x80, 0x01, 0xFF, 0x80, 0x01, 0xFF, 0x80, 0x01, 0xF8, 0x00, 0x00,
 73 |   0x1D, 0xC0, 0x03, 0x70, 0x00, 0x80, 0x0C, 0x60, 0x05, 0xB0, 0x07, 0xF0, 0x08, 0x90, 0x09, 0x10,
 74 |   0x1F, 0xF8, 0x09, 0xD0, 0x0B, 0x90, 0x1F, 0x7C, 0x03, 0xF0, 0x0F, 0xC0, 0xFC, 0x0F, 0x07, 0x90,
 75 |   0x0D, 0x43, 0xC0, 0x03, 0x07, 0x90, 0x05, 0x64, 0x00, 0x00, 0xCF, 0x10, 0x07, 0xFC, 0x00, 0x00,
 76 |   0x26, 0x10, 0x01, 0x80, 0x00, 0x00, 0x10, 0x20, 0x01, 0x00, 0x00, 0x00, 0x0E, 0x40, 0x01, 0x80,
 77 |   0x07, 0xF0, 0x01, 0x80, 0x00, 0x80, 0x07, 0xC8, 0x00, 0x80, 0x00, 0x80, 0x0B, 0xE8, 0x00, 0x80,
 78 |   0x00, 0x87, 0x97, 0xE9, 0xE0, 0x80, 0x00, 0x87, 0xDF, 0xEF, 0xA0, 0x80, 0x00, 0x4B, 0xFF, 0xFF,
 79 |   0xA0, 0x80, 0x00, 0x6B, 0xDF, 0xFB, 0xA3, 0x00, 0x00, 0x24, 0x97, 0xE8, 0x24, 0x00, 0x00, 0x1E,
 80 |   0x1F, 0xC0, 0x2C, 0x00, 0x00, 0x07, 0xF8, 0x1F, 0xF0, 0x00, 0x00, 0x00, 0x0F, 0xF8, 0x00, 0x00
 81 | };
 82 | 
 83 | 
 84 | 
 85 | void setup()   {
 86 | 
 87 | 
 88 |   pinMode(3, INPUT_PULLUP);
 89 |   pinMode(12, INPUT_PULLUP);
 90 |   pinMode(11, INPUT_PULLUP);
 91 |   display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
 92 |   display.display();
 93 |   display.clearDisplay();
 94 |   display.setTextSize(0);
 95 |   display.drawBitmap(6, 11, storm, 48, 48, 1);
 96 |   display.setFont(&FreeSans9pt7b);
 97 |   display.setTextColor(WHITE);
 98 |   display.setCursor(65, 14);
 99 |   display.println("xWing");
100 |   display.setFont();
101 |   display.setCursor(65, 17);
102 |   display.setTextSize(0);
103 |   display.println("vs");
104 |   display.setCursor(0, 0);
105 |   float voltaza = readVcc() / 1000;
106 |   display.println(voltaza);;
107 |   display.setFont(&FreeSans9pt7b);
108 |   display.setCursor(65, 39);
109 |   display.println("Death");
110 |   display.setFont();
111 |   display.setCursor(65, 42);
112 |   display.println("star ");
113 |   display.setTextSize(0);
114 | 
115 |   display.setCursor(65, 55);
116 | 
117 |   display.println("by Danko");
118 | 
119 |   display.setCursor(65, 20);
120 | 
121 |   display.display();
122 | 
123 | 
124 | 
125 |   display.setFont();
126 |   beep(a, 500);
127 |   beep(a, 500);
128 |   beep(a, 500);
129 |   beep(f, 350);
130 |   beep(cH, 150);
131 |   beep(a, 500);
132 |   beep(f, 350);
133 |   beep(cH, 150);
134 |   beep(a, 650);
135 | 
136 |   delay(500);
137 | 
138 | 
139 | 
140 |   delay(500);
141 | }
142 | int metx = 0;
143 | int mety = 0;
144 | int postoji = 0;
145 | int nep = 8;
146 | int smjer = 0;
147 | int go = 0;
148 | int rx = 95;
149 | int ry = 0;
150 | int rx2 = 95;
151 | int ry2 = 0;
152 | int rx3 = 95;
153 | int ry3 = 0;
154 | int bodovi = 0;
155 | 
156 | int brzina = 3; //speed of bullet
157 | int bkugle = 1;
158 | int najmanja = 600;
159 | int najveca = 1200;
160 | int promjer = 10;
161 | 
162 | int rx4 = 95;
163 | int ry4 = 0;
164 | int zivoti = 5;
165 | int poc = 0;
166 | int ispaljeno = 0;
167 | int nivo = 1;
168 | int centar = 95;
169 | unsigned long pocetno = 0;
170 | unsigned long odabrano = 0;
171 | unsigned long trenutno = 0;
172 | unsigned long nivovrije = 0;
173 | int poz = 30;
174 | void loop() {
175 | 
176 |   if (go == 0) {
177 |     display.clearDisplay();
178 | 
179 |     display.drawPixel(50, 30, 1);
180 |     display.drawPixel(30, 17, 1);
181 |     display.drawPixel(60, 18, 1);
182 |     display.drawPixel(55, 16, 1);
183 |     display.drawPixel(25, 43, 1);
184 |     display.drawPixel(100, 43, 1);
185 |     display.drawPixel(117, 52, 1);
186 |     display.drawPixel(14, 49, 1);
187 |     display.drawPixel(24, 24, 1);
188 |     display.drawPixel(78, 36, 1);
189 |     display.drawPixel(80, 57, 1);
190 |     display.drawPixel(107, 11, 1);
191 |     display.drawPixel(150, 11, 1);
192 |     display.drawPixel(5, 5, 1);
193 |     display.drawPixel(8, 7, 1);
194 |     display.drawPixel(70, 12, 1);
195 |     display.drawPixel(10, 56, 1);
196 |     display.drawPixel(70, 25, 1);
197 | 
198 | 
199 | 
200 |     if (poc == 0) {
201 |       pocetno = millis();
202 |       odabrano = random(400, 1200);
203 |       poc = 1;
204 |     }
205 |     trenutno = millis();
206 | 
207 | 
208 |     //nivoi
209 | 
210 |     if ((trenutno - nivovrije) > 50000)
211 |     {
212 |       nivovrije = trenutno;
213 |       nivo = nivo + 1;
214 | 
215 |       brzina = brzina + 1; //brizna neprijateljevog metka
216 |       if ( nivo % 2 == 0 )
217 |       {
218 |         bkugle = bkugle + 1;
219 |         promjer = promjer - 1;
220 |       }
221 |       najmanja = najmanja - 50;
222 |       najveca = najveca - 50;
223 | 
224 |     }
225 | 
226 | 
227 | 
228 |     if ((odabrano + pocetno) < trenutno)
229 |     {
230 |       poc = 0;
231 |       ispaljeno = ispaljeno + 1;
232 |       if (ispaljeno == 1)
233 |       { rx = 95;
234 |         ry = nep;
235 |       }
236 |       if (ispaljeno == 2) {
237 |         rx2 = 95;
238 |         ry2 = nep;
239 |       }
240 |       if (ispaljeno == 3)
241 |       {
242 |         rx3 = 95;
243 |         ry3 = nep;
244 |       }
245 | 
246 | 
247 |       if (ispaljeno == 4) {
248 |         rx4 = 95;
249 |         ry4 = nep;
250 | 
251 |       }
252 | 
253 | 
254 | 
255 |     }
256 | 
257 | 
258 |     if (ispaljeno > 0)
259 |     {
260 |       display.drawCircle(rx, ry, 2, 1);
261 |       rx = rx - brzina;
262 |     }
263 | 
264 |     if (ispaljeno > 1)
265 |     {
266 |       display.drawCircle(rx2, ry2, 1, 1);
267 |       rx2 = rx2 - brzina;
268 |     }
269 | 
270 |     if (ispaljeno > 2)
271 |     {
272 |       display.drawCircle(rx3, ry3, 4, 1);
273 |       rx3 = rx3 - brzina;
274 |     }
275 | 
276 |     if (ispaljeno > 3)
277 |     {
278 |       display.drawCircle(rx4, ry4, 2, 1);
279 |       rx4 = rx4 - brzina;
280 |     }
281 | 
282 |     if (digitalRead(12) == 0 && poz >= 2) {
283 |       poz = poz - 2;
284 |     }
285 | 
286 |     if (digitalRead(11) == 0 && poz <= 46) {
287 |       poz = poz + 2;
288 |     }
289 | 
290 | 
291 |     if (digitalRead(3) == 0 && postoji == 0)
292 |     {
293 |       postoji = 1;
294 |       metx = 6;
295 |       mety = poz + 8;
296 |       tone(9, 1200, 20);
297 | 
298 | 
299 |     }
300 |     if (postoji == 1)
301 | 
302 |     {
303 |       metx = metx + 8 ;
304 | 
305 |       display.drawLine(metx, mety, metx + 4, mety, 1);
306 |     }
307 | 
308 |     display.drawBitmap(4, poz, dioda16, 16, 16, 1);
309 |     display.fillCircle(centar, nep, promjer, 1);
310 |     display.fillCircle(centar + 2, nep + 3, promjer / 3, 0);
311 | 
312 |     display.setTextSize(1);
313 |     display.setTextColor(WHITE);
314 |     display.setCursor(33, 57);
315 |     display.println("score:");
316 |     display.setCursor(68, 57);
317 |     display.println(bodovi);
318 | 
319 |     display.setCursor(33, 0);
320 |     display.println("lives:");
321 |     display.setCursor(68, 0);
322 |     display.println(zivoti);
323 | 
324 |     display.setCursor(110, 0);
325 |     display.println("L:");
326 | 
327 |     display.setCursor(122, 0);
328 |     display.println(nivo);
329 | 
330 |     display.setCursor(108, 57);
331 |     display.println(trenutno / 1000);
332 |     display.display();
333 | 
334 |     if (metx > 128)postoji = 0;
335 | 
336 | 
337 | 
338 |     if (smjer == 0) {
339 |       nep = nep + bkugle;
340 |     }
341 |     else
342 |     {
343 |       nep = nep - bkugle;
344 |     }
345 | 
346 |     if (nep >= (64 - promjer))
347 |       smjer = 1;
348 |     if (nep <= promjer)
349 |       smjer = 0;
350 | 
351 |     if (mety >= nep - promjer && mety <= nep + promjer)
352 |       if (metx > (centar - promjer) && metx < (centar + promjer))
353 |       {
354 |         metx = -20;
355 |         tone(9, 500, 20);
356 |         bodovi = bodovi + 1;
357 |         postoji = 0;
358 |       }
359 | 
360 |     int pozicija = poz + 8;
361 |     if (ry >= pozicija - 8 && ry <= pozicija + 8)
362 |       if (rx < 12 && rx > 4)
363 |       {
364 |         rx = 95;
365 |         ry = -50;
366 |         tone(9, 100, 100);
367 |         zivoti = zivoti - 1;
368 |       }
369 | 
370 |     if (ry2 >= pozicija - 8 && ry2 <= pozicija + 8)
371 |       if (rx2 < 12 && rx2 > 4)
372 |       {
373 |         rx2 = -50;
374 |         ry2 = -50;
375 |         tone(9, 100, 100);
376 |         zivoti = zivoti - 1;
377 |       }
378 | 
379 |     if (ry3 >= pozicija - 8 && ry3 <= pozicija + 8)
380 |       if (rx3 < 12 && rx3 > 4)
381 |       {
382 |         rx3 = -50;
383 |         ry3 = -50;
384 |         tone(9, 100, 100);
385 |         zivoti = zivoti - 1;
386 |       }
387 | 
388 |     if (ry4 >= pozicija - 8 && ry4 <= pozicija + 8)
389 |       if (rx4 < 12 && rx4 > 4)
390 |       {
391 |         rx4 = 200;
392 |         ry4 = -50;
393 |         ispaljeno = 0;
394 |         tone(9, 100, 100);
395 |         zivoti = zivoti - 1;
396 |       }
397 | 
398 |     if (rx4 < 1) {
399 |       ispaljeno = 0;
400 |       rx4 = 200;
401 |     }
402 | 
403 |     if (zivoti == 0)
404 |       go = 1;
405 |   }
406 | 
407 |   if (go == 1)
408 |   {
409 |     if (zivoti == 0) {
410 |       tone(9, 200, 300);
411 |       delay(300);
412 |       tone(9, 250, 200);
413 |       delay(200);
414 |       tone(9, 300, 300);
415 |       delay(300);
416 |       zivoti = 5;
417 |     }
418 |     display.clearDisplay();
419 |     display.setFont();
420 |     display.setTextSize(2);
421 |     display.setTextColor(WHITE);
422 |     display.setCursor(7, 10);
423 |     display.println("GAME OVER!");
424 |     display.setTextSize(1);
425 |     display.setCursor(7, 30);
426 |     display.println("score:");
427 |     display.setCursor(44, 30);
428 |     display.println(bodovi);
429 |     display.setCursor(7, 40);
430 |     display.println("level:");
431 |     display.setCursor(44, 40);
432 |     display.println(nivo);
433 |     display.setCursor(7, 50);
434 |     display.println("time(s):");
435 |     display.setCursor(60, 50);
436 | 
437 |     display.println(trenutno / 1000);
438 |     display.display();
439 | 
440 |     if (digitalRead(3) == 0)
441 |     {
442 |       tone(9, 280, 300);
443 |       delay(300);
444 |       tone(9, 250, 200);
445 |       delay(200);
446 |       tone(9, 370, 300);
447 |       delay(300);
448 |       ponovo();
449 |     }
450 |   }
451 | }
452 | 
453 | void ponovo()
454 | {
455 |   metx = 0;
456 |   mety = 0;
457 |   postoji = 0;
458 |   nep = 8;
459 |   smjer = 0;
460 |   go = 0;
461 |   rx = 95;
462 |   ry = 0;
463 |   rx2 = 95;
464 |   ry2 = 0;
465 |   rx3 = 95;
466 |   ry3 = 0;
467 |   bodovi = 0;
468 | 
469 |   brzina = 3; //brizna neprijateljevog metka
470 |   bkugle = 1;
471 |   najmanja = 600;
472 |   najveca = 1200;
473 |   promjer = 12;
474 | 
475 |   rx4 = 95;
476 |   ry4 = 0;
477 |   zivoti = 5;
478 |   poc = 0;
479 |   ispaljeno = 0;
480 |   nivo = 1;
481 |   pocetno = 0;
482 |   odabrano = 0;
483 |   trenutno = 0;
484 |   nivovrije = 0;
485 | 
486 | 
487 | 
488 | 
489 | }
490 | 
491 | long readVcc() {
492 |   // Read 1.1V reference against AVcc
493 |   // set the reference to Vcc and the measurement to the internal 1.1V reference
494 | #if defined(__AVR_ATmega32U4__) || defined(__AVR_ATmega1280__) || defined(__AVR_ATmega2560__)
495 |   ADMUX = _BV(REFS0) | _BV(MUX4) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1);
496 | #elif defined (__AVR_ATtiny24__) || defined(__AVR_ATtiny44__) || defined(__AVR_ATtiny84__)
497 |   ADMUX = _BV(MUX5) | _BV(MUX0);
498 | #elif defined (__AVR_ATtiny25__) || defined(__AVR_ATtiny45__) || defined(__AVR_ATtiny85__)
499 |   ADMUX = _BV(MUX3) | _BV(MUX2);
500 | #else
501 |   ADMUX = _BV(REFS0) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1);
502 | #endif
503 | 
504 |   delay(2); // Wait for Vref to settle
505 |   ADCSRA |= _BV(ADSC); // Start conversion
506 |   while (bit_is_set(ADCSRA, ADSC)); // measuring
507 | 
508 |   uint8_t low  = ADCL; // must read ADCL first - it then locks ADCH
509 |   uint8_t high = ADCH; // unlocks both
510 | 
511 |   long result = (high << 8) | low;
512 | 
513 |   result = 1125300L / result; // Calculate Vcc (in mV); 1125300 = 1.1*1023*1000
514 |   return result; // Vcc in millivolts
515 | }
516 | 
517 | 
518 | void beep(int note, int duration)
519 | {
520 |   //Play tone on buzzerPin
521 |   tone(9, note, duration);
522 | 
523 | 
524 | 
525 |   delay(duration);
526 | 
527 | 
528 | 
529 |   noTone(9);
530 | 
531 |   delay(50);
532 | 
533 | 
534 | }
535 | 
536 | 


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/spaceship-game/thumbnail.png:
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https://raw.githubusercontent.com/wokwi/wokwi-playgrounds/a4cbf14c128b5dc971ad0a1dc421513075f4e297/spaceship-game/thumbnail.png


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/ssd1306/lesson.json:
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1 | {
2 |   "title": "128x64 OLED Display",
3 |   "thumbnail": "thumbnail.png"
4 | }
5 | 


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/ssd1306/lesson.md:
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1 | The OLED display is connected at I²C address `0x3D`.
2 | 
3 | Click the **Run Code** button on the right to see it in action:
4 | 
5 | <wokwi-arduino-uno></wokwi-arduino-uno>
6 | <wokwi-ssd1306 i2c-address="0x3d"></wokwi-ssd1306>
7 | 
8 | Can you change the code to display your name?
9 | 


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/ssd1306/sketch.ino:
--------------------------------------------------------------------------------
  1 | /**************************************************************************
  2 |  This is an example for our Monochrome OLEDs based on SSD1306 drivers
  3 | 
  4 |  Pick one up today in the adafruit shop!
  5 |  ------> http://www.adafruit.com/category/63_98
  6 | 
  7 |  This example is for a 128x64 pixel display using I2C to communicate
  8 |  3 pins are required to interface (two I2C and one reset).
  9 | 
 10 |  Adafruit invests time and resources providing this open
 11 |  source code, please support Adafruit and open-source
 12 |  hardware by purchasing products from Adafruit!
 13 | 
 14 |  Written by Limor Fried/Ladyada for Adafruit Industries,
 15 |  with contributions from the open source community.
 16 |  BSD license, check license.txt for more information
 17 |  All text above, and the splash screen below must be
 18 |  included in any redistribution.
 19 |  **************************************************************************/
 20 | 
 21 | #include <SPI.h>
 22 | #include <Wire.h>
 23 | #include <Adafruit_GFX.h>
 24 | #include <Adafruit_SSD1306.h>
 25 | 
 26 | #define SCREEN_WIDTH 128 // OLED display width, in pixels
 27 | #define SCREEN_HEIGHT 64 // OLED display height, in pixels
 28 | 
 29 | // Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
 30 | #define OLED_RESET     4 // Reset pin # (or -1 if sharing Arduino reset pin)
 31 | Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
 32 | 
 33 | #define NUMFLAKES     10 // Number of snowflakes in the animation example
 34 | 
 35 | #define LOGO_HEIGHT   16
 36 | #define LOGO_WIDTH    16
 37 | static const unsigned char PROGMEM logo_bmp[] =
 38 | { B00000000, B11000000,
 39 |   B00000001, B11000000,
 40 |   B00000001, B11000000,
 41 |   B00000011, B11100000,
 42 |   B11110011, B11100000,
 43 |   B11111110, B11111000,
 44 |   B01111110, B11111111,
 45 |   B00110011, B10011111,
 46 |   B00011111, B11111100,
 47 |   B00001101, B01110000,
 48 |   B00011011, B10100000,
 49 |   B00111111, B11100000,
 50 |   B00111111, B11110000,
 51 |   B01111100, B11110000,
 52 |   B01110000, B01110000,
 53 |   B00000000, B00110000 };
 54 | 
 55 | void setup() {
 56 |   Serial.begin(9600);
 57 | 
 58 |   // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
 59 |   if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3D)) { // Address 0x3D for 128x64
 60 |     Serial.println(F("SSD1306 allocation failed"));
 61 |     for(;;); // Don't proceed, loop forever
 62 |   }
 63 | 
 64 |   // Show initial display buffer contents on the screen --
 65 |   // the library initializes this with an Adafruit splash screen.
 66 |   display.display();
 67 |   delay(2000); // Pause for 2 seconds
 68 | 
 69 |   // Clear the buffer
 70 |   display.clearDisplay();
 71 | 
 72 |   // Draw a single pixel in white
 73 |   display.drawPixel(10, 10, SSD1306_WHITE);
 74 | 
 75 |   // Show the display buffer on the screen. You MUST call display() after
 76 |   // drawing commands to make them visible on screen!
 77 |   display.display();
 78 |   delay(2000);
 79 |   // display.display() is NOT necessary after every single drawing command,
 80 |   // unless that's what you want...rather, you can batch up a bunch of
 81 |   // drawing operations and then update the screen all at once by calling
 82 |   // display.display(). These examples demonstrate both approaches...
 83 | 
 84 |   testdrawline();      // Draw many lines
 85 | 
 86 |   testdrawrect();      // Draw rectangles (outlines)
 87 | 
 88 |   testfillrect();      // Draw rectangles (filled)
 89 | 
 90 |   testdrawcircle();    // Draw circles (outlines)
 91 | 
 92 |   testfillcircle();    // Draw circles (filled)
 93 | 
 94 |   testdrawroundrect(); // Draw rounded rectangles (outlines)
 95 | 
 96 |   testfillroundrect(); // Draw rounded rectangles (filled)
 97 | 
 98 |   testdrawtriangle();  // Draw triangles (outlines)
 99 | 
100 |   testfilltriangle();  // Draw triangles (filled)
101 | 
102 |   testdrawchar();      // Draw characters of the default font
103 | 
104 |   testdrawstyles();    // Draw 'stylized' characters
105 | 
106 |   testscrolltext();    // Draw scrolling text
107 | 
108 |   testdrawbitmap();    // Draw a small bitmap image
109 | 
110 |   // Invert and restore display, pausing in-between
111 |   display.invertDisplay(true);
112 |   delay(1000);
113 |   display.invertDisplay(false);
114 |   delay(1000);
115 | 
116 |   testanimate(logo_bmp, LOGO_WIDTH, LOGO_HEIGHT); // Animate bitmaps
117 | }
118 | 
119 | void loop() {
120 | }
121 | 
122 | void testdrawline() {
123 |   int16_t i;
124 | 
125 |   display.clearDisplay(); // Clear display buffer
126 | 
127 |   for(i=0; i<display.width(); i+=4) {
128 |     display.drawLine(0, 0, i, display.height()-1, SSD1306_WHITE);
129 |     display.display(); // Update screen with each newly-drawn line
130 |     delay(1);
131 |   }
132 |   for(i=0; i<display.height(); i+=4) {
133 |     display.drawLine(0, 0, display.width()-1, i, SSD1306_WHITE);
134 |     display.display();
135 |     delay(1);
136 |   }
137 |   delay(250);
138 | 
139 |   display.clearDisplay();
140 | 
141 |   for(i=0; i<display.width(); i+=4) {
142 |     display.drawLine(0, display.height()-1, i, 0, SSD1306_WHITE);
143 |     display.display();
144 |     delay(1);
145 |   }
146 |   for(i=display.height()-1; i>=0; i-=4) {
147 |     display.drawLine(0, display.height()-1, display.width()-1, i, SSD1306_WHITE);
148 |     display.display();
149 |     delay(1);
150 |   }
151 |   delay(250);
152 | 
153 |   display.clearDisplay();
154 | 
155 |   for(i=display.width()-1; i>=0; i-=4) {
156 |     display.drawLine(display.width()-1, display.height()-1, i, 0, SSD1306_WHITE);
157 |     display.display();
158 |     delay(1);
159 |   }
160 |   for(i=display.height()-1; i>=0; i-=4) {
161 |     display.drawLine(display.width()-1, display.height()-1, 0, i, SSD1306_WHITE);
162 |     display.display();
163 |     delay(1);
164 |   }
165 |   delay(250);
166 | 
167 |   display.clearDisplay();
168 | 
169 |   for(i=0; i<display.height(); i+=4) {
170 |     display.drawLine(display.width()-1, 0, 0, i, SSD1306_WHITE);
171 |     display.display();
172 |     delay(1);
173 |   }
174 |   for(i=0; i<display.width(); i+=4) {
175 |     display.drawLine(display.width()-1, 0, i, display.height()-1, SSD1306_WHITE);
176 |     display.display();
177 |     delay(1);
178 |   }
179 | 
180 |   delay(2000); // Pause for 2 seconds
181 | }
182 | 
183 | void testdrawrect(void) {
184 |   display.clearDisplay();
185 | 
186 |   for(int16_t i=0; i<display.height()/2; i+=2) {
187 |     display.drawRect(i, i, display.width()-2*i, display.height()-2*i, SSD1306_WHITE);
188 |     display.display(); // Update screen with each newly-drawn rectangle
189 |     delay(1);
190 |   }
191 | 
192 |   delay(2000);
193 | }
194 | 
195 | void testfillrect(void) {
196 |   display.clearDisplay();
197 | 
198 |   for(int16_t i=0; i<display.height()/2; i+=3) {
199 |     // The INVERSE color is used so rectangles alternate white/black
200 |     display.fillRect(i, i, display.width()-i*2, display.height()-i*2, SSD1306_INVERSE);
201 |     display.display(); // Update screen with each newly-drawn rectangle
202 |     delay(1);
203 |   }
204 | 
205 |   delay(2000);
206 | }
207 | 
208 | void testdrawcircle(void) {
209 |   display.clearDisplay();
210 | 
211 |   for(int16_t i=0; i<max(display.width(),display.height())/2; i+=2) {
212 |     display.drawCircle(display.width()/2, display.height()/2, i, SSD1306_WHITE);
213 |     display.display();
214 |     delay(1);
215 |   }
216 | 
217 |   delay(2000);
218 | }
219 | 
220 | void testfillcircle(void) {
221 |   display.clearDisplay();
222 | 
223 |   for(int16_t i=max(display.width(),display.height())/2; i>0; i-=3) {
224 |     // The INVERSE color is used so circles alternate white/black
225 |     display.fillCircle(display.width() / 2, display.height() / 2, i, SSD1306_INVERSE);
226 |     display.display(); // Update screen with each newly-drawn circle
227 |     delay(1);
228 |   }
229 | 
230 |   delay(2000);
231 | }
232 | 
233 | void testdrawroundrect(void) {
234 |   display.clearDisplay();
235 | 
236 |   for(int16_t i=0; i<display.height()/2-2; i+=2) {
237 |     display.drawRoundRect(i, i, display.width()-2*i, display.height()-2*i,
238 |       display.height()/4, SSD1306_WHITE);
239 |     display.display();
240 |     delay(1);
241 |   }
242 | 
243 |   delay(2000);
244 | }
245 | 
246 | void testfillroundrect(void) {
247 |   display.clearDisplay();
248 | 
249 |   for(int16_t i=0; i<display.height()/2-2; i+=2) {
250 |     // The INVERSE color is used so round-rects alternate white/black
251 |     display.fillRoundRect(i, i, display.width()-2*i, display.height()-2*i,
252 |       display.height()/4, SSD1306_INVERSE);
253 |     display.display();
254 |     delay(1);
255 |   }
256 | 
257 |   delay(2000);
258 | }
259 | 
260 | void testdrawtriangle(void) {
261 |   display.clearDisplay();
262 | 
263 |   for(int16_t i=0; i<max(display.width(),display.height())/2; i+=5) {
264 |     display.drawTriangle(
265 |       display.width()/2  , display.height()/2-i,
266 |       display.width()/2-i, display.height()/2+i,
267 |       display.width()/2+i, display.height()/2+i, SSD1306_WHITE);
268 |     display.display();
269 |     delay(1);
270 |   }
271 | 
272 |   delay(2000);
273 | }
274 | 
275 | void testfilltriangle(void) {
276 |   display.clearDisplay();
277 | 
278 |   for(int16_t i=max(display.width(),display.height())/2; i>0; i-=5) {
279 |     // The INVERSE color is used so triangles alternate white/black
280 |     display.fillTriangle(
281 |       display.width()/2  , display.height()/2-i,
282 |       display.width()/2-i, display.height()/2+i,
283 |       display.width()/2+i, display.height()/2+i, SSD1306_INVERSE);
284 |     display.display();
285 |     delay(1);
286 |   }
287 | 
288 |   delay(2000);
289 | }
290 | 
291 | void testdrawchar(void) {
292 |   display.clearDisplay();
293 | 
294 |   display.setTextSize(1);      // Normal 1:1 pixel scale
295 |   display.setTextColor(SSD1306_WHITE); // Draw white text
296 |   display.setCursor(0, 0);     // Start at top-left corner
297 |   display.cp437(true);         // Use full 256 char 'Code Page 437' font
298 | 
299 |   // Not all the characters will fit on the display. This is normal.
300 |   // Library will draw what it can and the rest will be clipped.
301 |   for(int16_t i=0; i<256; i++) {
302 |     if(i == '\n') display.write(' ');
303 |     else          display.write(i);
304 |   }
305 | 
306 |   display.display();
307 |   delay(2000);
308 | }
309 | 
310 | void testdrawstyles(void) {
311 |   display.clearDisplay();
312 | 
313 |   display.setTextSize(1);             // Normal 1:1 pixel scale
314 |   display.setTextColor(SSD1306_WHITE);        // Draw white text
315 |   display.setCursor(0,0);             // Start at top-left corner
316 |   display.println(F("Hello, world!"));
317 | 
318 |   display.setTextColor(SSD1306_BLACK, SSD1306_WHITE); // Draw 'inverse' text
319 |   display.println(3.141592);
320 | 
321 |   display.setTextSize(2);             // Draw 2X-scale text
322 |   display.setTextColor(SSD1306_WHITE);
323 |   display.print(F("0x")); display.println(0xDEADBEEF, HEX);
324 | 
325 |   display.display();
326 |   delay(2000);
327 | }
328 | 
329 | void testscrolltext(void) {
330 |   display.clearDisplay();
331 | 
332 |   display.setTextSize(2); // Draw 2X-scale text
333 |   display.setTextColor(SSD1306_WHITE);
334 |   display.setCursor(10, 0);
335 |   display.println(F("scroll"));
336 |   display.display();      // Show initial text
337 |   delay(100);
338 | 
339 |   // Scroll in various directions, pausing in-between:
340 |   display.startscrollright(0x00, 0x0F);
341 |   delay(2000);
342 |   display.stopscroll();
343 |   delay(1000);
344 |   display.startscrollleft(0x00, 0x0F);
345 |   delay(2000);
346 |   display.stopscroll();
347 |   delay(1000);
348 |   display.startscrolldiagright(0x00, 0x07);
349 |   delay(2000);
350 |   display.startscrolldiagleft(0x00, 0x07);
351 |   delay(2000);
352 |   display.stopscroll();
353 |   delay(1000);
354 | }
355 | 
356 | void testdrawbitmap(void) {
357 |   display.clearDisplay();
358 | 
359 |   display.drawBitmap(
360 |     (display.width()  - LOGO_WIDTH ) / 2,
361 |     (display.height() - LOGO_HEIGHT) / 2,
362 |     logo_bmp, LOGO_WIDTH, LOGO_HEIGHT, 1);
363 |   display.display();
364 |   delay(1000);
365 | }
366 | 
367 | #define XPOS   0 // Indexes into the 'icons' array in function below
368 | #define YPOS   1
369 | #define DELTAY 2
370 | 
371 | void testanimate(const uint8_t *bitmap, uint8_t w, uint8_t h) {
372 |   int8_t f, icons[NUMFLAKES][3];
373 | 
374 |   // Initialize 'snowflake' positions
375 |   for(f=0; f< NUMFLAKES; f++) {
376 |     icons[f][XPOS]   = random(1 - LOGO_WIDTH, display.width());
377 |     icons[f][YPOS]   = -LOGO_HEIGHT;
378 |     icons[f][DELTAY] = random(1, 6);
379 |     Serial.print(F("x: "));
380 |     Serial.print(icons[f][XPOS], DEC);
381 |     Serial.print(F(" y: "));
382 |     Serial.print(icons[f][YPOS], DEC);
383 |     Serial.print(F(" dy: "));
384 |     Serial.println(icons[f][DELTAY], DEC);
385 |   }
386 | 
387 |   for(;;) { // Loop forever...
388 |     display.clearDisplay(); // Clear the display buffer
389 | 
390 |     // Draw each snowflake:
391 |     for(f=0; f< NUMFLAKES; f++) {
392 |       display.drawBitmap(icons[f][XPOS], icons[f][YPOS], bitmap, w, h, SSD1306_WHITE);
393 |     }
394 | 
395 |     display.display(); // Show the display buffer on the screen
396 |     delay(200);        // Pause for 1/10 second
397 | 
398 |     // Then update coordinates of each flake...
399 |     for(f=0; f< NUMFLAKES; f++) {
400 |       icons[f][YPOS] += icons[f][DELTAY];
401 |       // If snowflake is off the bottom of the screen...
402 |       if (icons[f][YPOS] >= display.height()) {
403 |         // Reinitialize to a random position, just off the top
404 |         icons[f][XPOS]   = random(1 - LOGO_WIDTH, display.width());
405 |         icons[f][YPOS]   = -LOGO_HEIGHT;
406 |         icons[f][DELTAY] = random(1, 6);
407 |       }
408 |     }
409 |   }
410 | }
411 | 


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/ssd1306/thumbnail.png:
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https://raw.githubusercontent.com/wokwi/wokwi-playgrounds/a4cbf14c128b5dc971ad0a1dc421513075f4e297/ssd1306/thumbnail.png


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/tamaguino/lesson.json:
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1 | {}
2 | 


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/tamaguino/lesson.md:
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 1 | [Tamaguino](https://alojzjakob.github.io/Tamaguino/) is a tamagotchi clone for Arduino developed by [Alojz Jakob](Alojz Jakob).
 2 | 
 3 | Click the **Run Code** button on the right to see it in action:
 4 | 
 5 | <div style="text-align: center">
 6 |   <wokwi-ssd1306 i2c-address="0x3d"></wokwi-ssd1306>
 7 |   <div>
 8 |     <wokwi-pushbutton pin="7" color="red"></wokwi-pushbutton>
 9 |     <wokwi-pushbutton pin="8" color="green"></wokwi-pushbutton>
10 |     <wokwi-pushbutton pin="9" color="blue"></wokwi-pushbutton>
11 |   </div>
12 | </div>
13 | 


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/task-scheduler/lesson.json:
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1 | {
2 |   "title": "Task Scheduler Playground",
3 |   "thumbnail": "thumbnail.png",
4 |   "coverImage": "https://storage.googleapis.com/wokwi-blog-assets/covers/task-scheduler.png"
5 | }
6 | 


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/task-scheduler/lesson.md:
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 1 | ## Arduino Task Scheduler Playground
 2 | 
 3 | This page shows the [Arduino TaskScheduler Library](https://github.com/arkhipenko/TaskScheduler/) in action. 
 4 | 
 5 | <wokwi-led color="red" label="13"></wokwi-led>
 6 | <wokwi-led color="green" label="12"></wokwi-led>
 7 | 
 8 | Click <strong>Run Code</strong> to compile and run the code, and you will see
 9 | the red LED blinking in different rates, according to the 6 tasks defined
10 | in the demo code.
11 | 
12 | Can you change the code so that the green LED (connected to pin 12) blinks two
13 | times per second, while the red LED keeps blinking at different rates?
14 | 
15 | <small>Built with <span style="color:red">♥</span> for the Arduino community.</small>
16 | 


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/task-scheduler/sketch.ino:
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  1 | /*
  2 |    LED blink example from TaskScheduler.
  3 |    Source: https://github.com/arkhipenko/TaskScheduler/tree/master/examples/Scheduler_example00_Blink
  4 | */
  5 | 
  6 | 
  7 | // #define _TASK_TIMECRITICAL      // Enable monitoring scheduling overruns
  8 | #define _TASK_SLEEP_ON_IDLE_RUN // Enable 1 ms SLEEP_IDLE powerdowns between tasks if no callback methods were invoked during the pass
  9 | #define _TASK_STATUS_REQUEST    // Compile with support for StatusRequest functionality - triggering tasks on status change events in addition to time only
 10 | // #define _TASK_WDT_IDS           // Compile with support for wdt control points and task ids
 11 | // #define _TASK_LTS_POINTER       // Compile with support for local task storage pointer
 12 | // #define _TASK_PRIORITY          // Support for layered scheduling priority
 13 | // #define _TASK_MICRO_RES         // Support for microsecond resolution
 14 | // #define _TASK_STD_FUNCTION      // Support for std::function (ESP8266 and ESP32 ONLY)
 15 | // #define _TASK_DEBUG             // Make all methods and variables public for debug purposes
 16 | // #define _TASK_INLINE            // Make all methods "inline" - needed to support some multi-tab, multi-file implementations
 17 | // #define _TASK_TIMEOUT           // Support for overall task timeout
 18 | // #define _TASK_OO_CALLBACKS      // Support for dynamic callback method binding
 19 | #include <TaskScheduler.h>
 20 | 
 21 | // Debug and Test options
 22 | #define _DEBUG_
 23 | //#define _TEST_
 24 | 
 25 | #ifdef _DEBUG_
 26 | #define _PP(a) Serial.print(a);
 27 | #define _PL(a) Serial.println(a);
 28 | #else
 29 | #define _PP(a)
 30 | #define _PL(a)
 31 | #endif
 32 | 
 33 | // LED_BUILTIN  13
 34 | #if defined( ARDUINO_ARCH_ESP32 )
 35 | #define LED_BUILTIN  23 // esp32 dev2 kit does not have LED
 36 | #endif
 37 | 
 38 | // Scheduler
 39 | Scheduler ts;
 40 | 
 41 | /*
 42 |    Approach 1: LED is driven by the boolean variable; false = OFF, true = ON
 43 | */
 44 | #define PERIOD1 500
 45 | #define DURATION 10000
 46 | void blink1CB();
 47 | Task tBlink1 ( PERIOD1 * TASK_MILLISECOND, DURATION / PERIOD1, &blink1CB, &ts, true );
 48 | 
 49 | /*
 50 |    Approac 2: two callback methods: one turns ON, another turns OFF
 51 | */
 52 | #define PERIOD2 400
 53 | void blink2CB_ON();
 54 | void blink2CB_OFF();
 55 | Task tBlink2 ( PERIOD2 * TASK_MILLISECOND, DURATION / PERIOD2, &blink2CB_ON, &ts, false );
 56 | 
 57 | /*
 58 |    Approach 3: Use RunCounter
 59 | */
 60 | #define PERIOD3 300
 61 | void blink3CB();
 62 | Task tBlink3 (PERIOD3 * TASK_MILLISECOND, DURATION / PERIOD3, &blink3CB, &ts, false);
 63 | 
 64 | /*
 65 |    Approach 4: Use status request objects to pass control from one task to the other
 66 | */
 67 | #define PERIOD4 200
 68 | bool blink41OE();
 69 | void blink41();
 70 | void blink42();
 71 | void blink42OD();
 72 | Task tBlink4On  ( PERIOD4 * TASK_MILLISECOND, TASK_ONCE, blink41, &ts, false, &blink41OE );
 73 | Task tBlink4Off ( PERIOD4 * TASK_MILLISECOND, TASK_ONCE, blink42, &ts, false, NULL, &blink42OD );
 74 | 
 75 | 
 76 | /*
 77 |    Approach 5: Two interleaving tasks
 78 | */
 79 | #define PERIOD5 600
 80 | bool blink51OE();
 81 | void blink51();
 82 | void blink52();
 83 | void blink52OD();
 84 | Task tBlink5On  ( 600 * TASK_MILLISECOND, DURATION / PERIOD5, &blink51, &ts, false, &blink51OE );
 85 | Task tBlink5Off ( 600 * TASK_MILLISECOND, DURATION / PERIOD5, &blink52, &ts, false, NULL, &blink52OD );
 86 | 
 87 | 
 88 | /*
 89 |    Approach 6: RunCounter-based with random intervals
 90 | */
 91 | #define PERIOD6 300
 92 | void blink6CB();
 93 | bool blink6OE();
 94 | void blink6OD();
 95 | Task tBlink6 ( PERIOD6 * TASK_MILLISECOND, DURATION / PERIOD6, &blink6CB, &ts, false, &blink6OE, &blink6OD );
 96 | 
 97 | void setup() {
 98 |   // put your setup code here, to run once:
 99 | #if defined(_DEBUG_) || defined(_TEST_)
100 |   Serial.begin(115200);
101 |   delay(TASK_SECOND);
102 |   _PL("TaskScheduler Blink example");
103 |   _PL("Blinking for 10 seconds using various techniques\n");
104 |   delay(2 * TASK_SECOND);
105 | #endif
106 |   pinMode(LED_BUILTIN, OUTPUT);
107 | }
108 | 
109 | void loop() {
110 |   ts.execute();
111 | }
112 | 
113 | inline void LEDOn() {
114 |   digitalWrite( LED_BUILTIN, HIGH );
115 | }
116 | 
117 | inline void LEDOff() {
118 |   digitalWrite( LED_BUILTIN, LOW );
119 | }
120 | 
121 | // === 1 =======================================
122 | bool LED_state = false;
123 | void blink1CB() {
124 |   if ( tBlink1.isFirstIteration() ) {
125 |     _PP(millis());
126 |     _PL(": Blink1 - simple flag driven");
127 |     LED_state = false;
128 |   }
129 | 
130 |   if ( LED_state ) {
131 |     LEDOff();
132 |     LED_state = false;
133 |   }
134 |   else {
135 |     LEDOn();
136 |     LED_state = true;
137 |   }
138 | 
139 |   if ( tBlink1.isLastIteration() ) {
140 |     tBlink2.restartDelayed( 2 * TASK_SECOND );
141 |     LEDOff();
142 |   }
143 | }
144 | 
145 | 
146 | // === 2 ======================================
147 | void blink2CB_ON() {
148 |   if ( tBlink2.isFirstIteration() ) {
149 |     _PP(millis());
150 |     _PL(": Blink2 - 2 callback methods");
151 |   }
152 | 
153 |   LEDOn();
154 |   tBlink2.setCallback( &blink2CB_OFF );
155 | 
156 |   if ( tBlink2.isLastIteration() ) {
157 |     tBlink3.restartDelayed( 2 * TASK_SECOND );
158 |     LEDOff();
159 |   }
160 | }
161 | 
162 | 
163 | void blink2CB_OFF() {
164 | 
165 |   LEDOff();
166 |   tBlink2.setCallback( &blink2CB_ON );
167 | 
168 |   if ( tBlink2.isLastIteration() ) {
169 |     tBlink3.restartDelayed( 2 * TASK_SECOND );
170 |     LEDOff();
171 |   }
172 | }
173 | 
174 | 
175 | // === 3 =====================================
176 | void blink3CB() {
177 |   if ( tBlink3.isFirstIteration() ) {
178 |     _PP(millis());
179 |     _PL(": Blink3 - Run Counter driven");
180 |   }
181 | 
182 |   if ( tBlink3.getRunCounter() & 1 ) {
183 |     LEDOn();
184 |   }
185 |   else {
186 |     LEDOff();
187 |   }
188 | 
189 |   if ( tBlink3.isLastIteration() ) {
190 |     tBlink4On.setOnEnable( &blink41OE );
191 |     tBlink4On.restartDelayed( 2 * TASK_SECOND );
192 |     LEDOff();
193 |   }
194 | }
195 | 
196 | 
197 | // === 4 =============================================
198 | int counter = 0;
199 | bool blink41OE() {
200 |   _PP(millis());
201 |   _PL(": Blink4 - Internal status request based");
202 |   counter = 0;
203 |   tBlink4On.setOnEnable( NULL );
204 |   return true;
205 | }
206 | 
207 | void blink41() {
208 |   //  _PP(millis());
209 |   //  _PL(": blink41");
210 |   LEDOn();
211 |   StatusRequest* r = tBlink4On.getInternalStatusRequest();
212 |   tBlink4Off.waitForDelayed( r );
213 |   counter++;
214 | }
215 | 
216 | void blink42() {
217 |   //  _PP(millis());
218 |   //  _PL(": blink42");
219 |   LEDOff();
220 |   StatusRequest* r = tBlink4Off.getInternalStatusRequest();
221 |   tBlink4On.waitForDelayed( r );
222 |   counter++;
223 | }
224 | 
225 | 
226 | void blink42OD() {
227 |   if ( counter >= DURATION / PERIOD4 ) {
228 |     tBlink4On.disable();
229 |     tBlink4Off.disable();
230 | 
231 |     tBlink5On.setOnEnable( &blink51OE );
232 |     tBlink5On.restartDelayed( 2 * TASK_SECOND );
233 |     tBlink5Off.restartDelayed( 2 * TASK_SECOND + PERIOD5 / 2 );
234 |     LEDOff();
235 |   }
236 | }
237 | 
238 | 
239 | // === 5 ==========================================
240 | bool blink51OE() {
241 |   _PP(millis());
242 |   _PL(": Blink5 - Two interleaving tasks");
243 |   tBlink5On.setOnEnable( NULL );
244 |   return true;
245 | }
246 | void blink51() {
247 |   //  _PP(millis());
248 |   //  _PL(": blink51");
249 |   LEDOn();
250 | }
251 | void blink52() {
252 |   //  _PP(millis());
253 |   //  _PL(": blink52");
254 |   LEDOff();
255 | }
256 | void blink52OD() {
257 |   tBlink6.restartDelayed( 2 * TASK_SECOND );
258 |   LEDOff();
259 | }
260 | 
261 | 
262 | // === 6 ============================================
263 | long interval6 = 0;
264 | bool blink6OE() {
265 |   _PP(millis());
266 |   _PP(": Blink6 - RunCounter + Random ON interval = ");
267 |   interval6 = random( 100, 901 );
268 |   tBlink6.setInterval( interval6 );
269 |   _PL( interval6 );
270 |   tBlink6.delay( 2 * TASK_SECOND );
271 | 
272 |   return true;
273 | }
274 | 
275 | void blink6CB() {
276 |   if ( tBlink6.getRunCounter() & 1 ) {
277 |     LEDOn();
278 |     tBlink6.setInterval( interval6 );
279 |   }
280 |   else {
281 |     LEDOff();
282 |     tBlink6.setInterval( TASK_SECOND - interval6 );
283 |   }
284 | }
285 | 
286 | void blink6OD() {
287 |   tBlink1.restartDelayed( 2 * TASK_SECOND );
288 |   LEDOff();
289 | }
290 | 


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121 | 


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/traffic-light/lesson.json:
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1 | {
2 |   "title": "Traffic Light",
3 |   "thumbnail": "thumbnail.png"
4 | }
5 | 


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/traffic-light/lesson.md:
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 1 | # Traffic Light Playground
 2 | 
 3 | This sketch implements a simple traffic light.
 4 | It goes from red to green and back.
 5 | Green light blinks before going back to yellow.
 6 | 
 7 | <div style="border:solid black 4px; display: flex; flex-direction: column; background:#ddd; padding:16px 16px; width: 84px">
 8 |   <wokwi-led color="red" label="13"></wokwi-led>
 9 |   <wokwi-led color="yellow" label="12"></wokwi-led>
10 |   <wokwi-led color="green" label="11"></wokwi-led>
11 | </div>
12 | 
13 | Challenge: Make the green blink before changing to yellow.
14 | 


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/traffic-light/sketch.ino:
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 1 | #define RED 13
 2 | #define YELLOW 12
 3 | #define GREEN 11
 4 | 
 5 | void setup() {
 6 |   pinMode(RED, OUTPUT);
 7 |   pinMode(YELLOW, OUTPUT);
 8 |   pinMode(GREEN, OUTPUT);
 9 | }
10 | 
11 | void loop() {
12 |   digitalWrite(GREEN, HIGH);
13 |   delay(3000);
14 | 
15 |   digitalWrite(GREEN, LOW);
16 |   digitalWrite(YELLOW, HIGH);
17 |   delay(500);
18 | 
19 |   digitalWrite(YELLOW, LOW);
20 |   digitalWrite(RED, HIGH);
21 |   delay(2000);
22 | 
23 |   digitalWrite(YELLOW, HIGH);
24 |   delay(500);
25 |   digitalWrite(YELLOW, LOW);
26 |   digitalWrite(RED, LOW);
27 | }
28 | 


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/traffic-light/thumbnail.png:
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https://raw.githubusercontent.com/wokwi/wokwi-playgrounds/a4cbf14c128b5dc971ad0a1dc421513075f4e297/traffic-light/thumbnail.png


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/wokwi.json:
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1 | {
2 |   "name": "Arduino Playground",
3 |   "lang": "en",
4 |   "author": "Uri Shaked",
5 |   "description": "Tinker with Arduino code and various hardware modules",
6 |   "lessons": {}
7 | }
8 | 


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