├── .gitattributes ├── ESP32_Dishka └── ESP32_Dishka.ino ├── ESP32_IKEA └── ESP32_IKEA.ino ├── ESP32_IKEA_Firebase ├── Connections of Load Cells to the HX711 modules.JPG ├── ESP32_IKEA_Firebase.ino ├── Wiring of Load Cells.JPG └── desktop.ini ├── HX711 ├── .gitignore ├── .travis.yml ├── HX711.cpp ├── HX711.h ├── LICENSE ├── README.md ├── examples │ ├── HX711Serial │ │ └── HX711Serial.ino │ └── HX711SerialBegin │ │ └── HX711SerialBegin.ino └── library.json ├── Node-Red Flow.txt └── README.md /.gitattributes: -------------------------------------------------------------------------------- 1 | # Auto detect text files and perform LF normalization 2 | * text=auto 3 | -------------------------------------------------------------------------------- /ESP32_Dishka/ESP32_Dishka.ino: -------------------------------------------------------------------------------- 1 | #include "HX711.h" 2 | #include "soc/rtc.h" 3 | #include 4 | #include 5 | #include "SSD1306.h" 6 | 7 | const char* mqttServer = "192.168.0.203"; 8 | const int mqttPort = 1883; 9 | 10 | HX711 scale; 11 | WiFiClient espClient; 12 | PubSubClient client(espClient); 13 | SSD1306 display(0x3c, 5, 4); 14 | 15 | 16 | 17 | void setup() { 18 | Serial.begin(115200); 19 | rtc_clk_cpu_freq_set(RTC_CPU_FREQ_80M); 20 | Serial.println("Diska"); 21 | display.init(); 22 | display.flipScreenVertically(); 23 | display.setFont(ArialMT_Plain_24); 24 | displayString("Welcome", 64, 10); 25 | delay(100); 26 | WiFi.begin("*****", "*****" ); 27 | 28 | // Wi-Fi 29 | Serial.println("Connecting to WiFi.."); 30 | 31 | while (WiFi.status() != WL_CONNECTED) { 32 | delay(500); 33 | Serial.print("."); 34 | } 35 | Serial.println("Connected to the WiFi network"); 36 | 37 | // MQTT 38 | 39 | client.setServer(mqttServer, mqttPort); 40 | 41 | while (!client.connected()) { 42 | Serial.println("Connecting to MQTT..."); 43 | 44 | if (client.connect("ESP32Client" )) { 45 | 46 | Serial.println("connected"); 47 | 48 | } else { 49 | 50 | Serial.print("failed with state "); 51 | Serial.print(client.state()); 52 | } 53 | } 54 | 55 | Serial.println("Initializing the scale"); 56 | // parameter "gain" is ommited; the default value 128 is used by the library 57 | // HX711.DOUT - pin #A1 58 | // HX711.PD_SCK - pin #A0 59 | scale.begin(26, 25); 60 | 61 | 62 | /* 63 | // uncomment if you want to calibrate the bowl 64 | scale. set_scale(); 65 | scale.tare(); 66 | Serial.println("Put known weight on "); 67 | displayString("Calibrate", 64, 10); 68 | delay(2500); 69 | Serial.print(scale.get_units(10)); 70 | Serial.print(" Divide this value to the weight and insert it in the scale.set_scale() statement"); 71 | displayFloat(scale.get_units(10), 64, 15); 72 | while(1==1); 73 | 74 | */ 75 | 76 | Serial.println("Before setting up the scale:"); 77 | Serial.print("read: \t\t"); 78 | Serial.println(scale.read()); // print a raw reading from the ADC 79 | 80 | Serial.print("read average: \t\t"); 81 | Serial.println(scale.read_average(20)); // print the average of 20 readings from the ADC 82 | 83 | Serial.print("get value: \t\t"); 84 | Serial.println(scale.get_value(5)); // print the average of 5 readings from the ADC minus the tare weight (not set yet) 85 | 86 | Serial.print("get units: \t\t"); 87 | Serial.println(scale.get_units(5), 1); // print the average of 5 readings from the ADC minus tare weight (not set) divided 88 | // by the SCALE parameter (not set yet) 89 | 90 | scale.set_scale(233.82); // this value is obtained by calibrating the scale with known weights; see the README for details 91 | scale.tare(); // reset the scale to 0 92 | 93 | Serial.println("After setting up the scale:"); 94 | 95 | Serial.print("read: \t\t"); 96 | Serial.println(scale.read()); // print a raw reading from the ADC 97 | 98 | Serial.print("read average: \t\t"); 99 | Serial.println(scale.read_average(20)); // print the average of 20 readings from the ADC 100 | 101 | Serial.print("get value: \t\t"); 102 | Serial.println(scale.get_value(5)); // print the average of 5 readings from the ADC minus the tare weight, set with tare() 103 | 104 | Serial.print("get units: \t\t"); 105 | Serial.println(scale.get_units(5), 1); // print the average of 5 readings from the ADC minus tare weight, divided 106 | // by the SCALE parameter set with set_scale 107 | 108 | Serial.println("Readings:"); 109 | client.publish("esp/test", "Hello from ESP32"); 110 | } 111 | 112 | void loop() { 113 | Serial.print("one reading:\t"); 114 | Serial.print(scale.get_units(), 1); 115 | Serial.print("\t| average:\t"); 116 | Serial.println(scale.get_units(10), 1); 117 | 118 | int ww = (int)(scale.get_units(10) + 0.5); 119 | 120 | displayFloat(ww, 64, 15); 121 | 122 | client.loop(); 123 | 124 | scale.power_down(); // put the ADC in sleep mode 125 | delay(100); 126 | scale.power_up(); 127 | } 128 | 129 | void displayFloat(float dispFloat, int x, int y) { 130 | display.clear(); 131 | display.setColor(WHITE); 132 | display.setTextAlignment(TEXT_ALIGN_CENTER); 133 | display.drawString(64, 15, String(dispFloat, 0)); 134 | display.setFont(ArialMT_Plain_24); 135 | display.display(); 136 | } 137 | 138 | void displayString(String dispString, int x, int y) { 139 | display.clear(); 140 | display.setColor(WHITE); 141 | display.setTextAlignment(TEXT_ALIGN_CENTER); 142 | display.drawString(x, y, dispString); 143 | display.setFont(ArialMT_Plain_24); 144 | display.display(); 145 | } 146 | 147 | -------------------------------------------------------------------------------- /ESP32_IKEA/ESP32_IKEA.ino: -------------------------------------------------------------------------------- 1 | #include "HX711.h" 2 | #include "soc/rtc.h" 3 | #include 4 | #include 5 | #include 6 | 7 | const char* mqttServer = "192.168.0.203"; 8 | const int mqttPort = 1883; 9 | 10 | HX711 scale; 11 | WiFiClient espClient; 12 | PubSubClient client(espClient); 13 | 14 | 15 | 16 | void setup() { 17 | Serial.begin(115200); 18 | rtc_clk_cpu_freq_set(RTC_CPU_FREQ_80M); 19 | Serial.println("IKEA"); 20 | WiFi.begin(mySSID, myPASSWORD ); 21 | 22 | // Wi-Fi 23 | Serial.println("Connecting to WiFi.."); 24 | 25 | while (WiFi.status() != WL_CONNECTED) { 26 | delay(500); 27 | Serial.print("."); 28 | } 29 | Serial.println("Connected to the WiFi network"); 30 | 31 | // MQTT 32 | 33 | client.setServer(mqttServer, mqttPort); 34 | 35 | while (!client.connected()) { 36 | Serial.println("Connecting to MQTT..."); 37 | 38 | if (client.connect("ESP32Client", "admin", "admin" )) { 39 | 40 | Serial.println("connected"); 41 | 42 | } else { 43 | 44 | Serial.print("failed with state "); 45 | Serial.print(client.state()); 46 | Serial.println(" "); 47 | } 48 | } 49 | 50 | Serial.println("Initializing the scale"); 51 | // parameter "gain" is ommited; the default value 128 is used by the library 52 | 53 | scale.begin(26, 33); // DO,CK 54 | 55 | 56 | /* 57 | // uncomment if you want to calibrate the bowl 58 | scale. set_scale(); 59 | scale.tare(); 60 | Serial.println("Put known weight on "); 61 | delay(2500); 62 | Serial.print(scale.get_units(10)); 63 | Serial.print(" Divide this value to the weight and insert it in the scale.set_scale() statement"); 64 | while(1==1); 65 | */ 66 | 67 | 68 | Serial.println("Before setting up the scale:"); 69 | Serial.print("read: \t\t"); 70 | Serial.println(scale.read()); // print a raw reading from the ADC 71 | 72 | Serial.print("read average: \t\t"); 73 | Serial.println(scale.read_average(20)); // print the average of 20 readings from the ADC 74 | 75 | Serial.print("get value: \t\t"); 76 | Serial.println(scale.get_value(5)); // print the average of 5 readings from the ADC minus the tare weight (not set yet) 77 | 78 | Serial.print("get units: \t\t"); 79 | Serial.println(scale.get_units(5), 1); // print the average of 5 readings from the ADC minus tare weight (not set) divided 80 | // by the SCALE parameter (not set yet) 81 | 82 | scale.set_scale(233.82); // this value is obtained by calibrating the scale with known weights; see the README for details 83 | scale.tare(); // reset the scale to 0 84 | 85 | Serial.println("After setting up the scale:"); 86 | 87 | Serial.print("read: \t\t"); 88 | Serial.println(scale.read()); // print a raw reading from the ADC 89 | 90 | Serial.print("read average: \t\t"); 91 | Serial.println(scale.read_average(20)); // print the average of 20 readings from the ADC 92 | 93 | Serial.print("get value: \t\t"); 94 | Serial.println(scale.get_value(5)); // print the average of 5 readings from the ADC minus the tare weight, set with tare() 95 | 96 | Serial.print("get units: \t\t"); 97 | Serial.println(scale.get_units(5), 1); // print the average of 5 readings from the ADC minus tare weight, divided 98 | // by the SCALE parameter set with set_scale 99 | 100 | Serial.println("Readings:"); 101 | client.publish("ikea/service", "Hello from ESP32"); 102 | } 103 | 104 | void loop() { 105 | 106 | float averageWeight = (char)scale.get_units(10); 107 | Serial.print("one reading:\t"); 108 | Serial.print(scale.get_units(), 1); 109 | Serial.print("\t| average:\t"); 110 | Serial.println(averageWeight); 111 | 112 | char buf[20]; 113 | sprintf(buf, "%04.02f", averageWeight); 114 | client.publish("ikea/weight", buf); 115 | 116 | client.loop(); 117 | 118 | scale.power_down(); // put the ADC in sleep mode 119 | delay(1000); 120 | scale.power_up(); 121 | } 122 | 123 | -------------------------------------------------------------------------------- /ESP32_IKEA_Firebase/Connections of Load Cells to the HX711 modules.JPG: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/SensorsIot/Weight-Sensors/1df69ee81c62a4de2520fe2b1ea780bc161871f3/ESP32_IKEA_Firebase/Connections of Load Cells to the HX711 modules.JPG -------------------------------------------------------------------------------- /ESP32_IKEA_Firebase/ESP32_IKEA_Firebase.ino: -------------------------------------------------------------------------------- 1 | #include "HX711.h" 2 | #include "soc/rtc.h" 3 | #include 4 | #include 5 | #include 6 | 7 | #define FIREBASE_HOST myFIREBASE_HOST // replace with your credentials 8 | #define FIREBASE_AUTH myFIREBASE_AUTH // replace with your credentials 9 | #define SETUPPIN 27 10 | 11 | 12 | HX711 scale; 13 | 14 | byte goToSetup = true; 15 | 16 | void setup() { 17 | Serial.begin(115200); 18 | rtc_clk_cpu_freq_set(RTC_CPU_FREQ_80M); 19 | for (int i = 0; i < 10; i++) Serial.println("START"); 20 | pinMode(SETUPPIN, INPUT_PULLUP); 21 | goToSetup = digitalRead(SETUPPIN); 22 | Serial.println(goToSetup); 23 | if (goToSetup == 0) Serial.println("Calibrate"); 24 | WiFi.begin(mySSID, myPASSWORD ); //Replace with your credentials 25 | Serial.println("Connecting to WiFi.."); 26 | while (WiFi.status() != WL_CONNECTED) { 27 | delay(500); 28 | Serial.print("."); 29 | } 30 | Serial.println("Connected to the WiFi network"); 31 | Serial.println("Initializing Firebase"); 32 | Firebase.begin(FIREBASE_HOST, FIREBASE_AUTH); 33 | 34 | Serial.println("Initializing the scale"); 35 | // parameter "gain" is ommited; the default value 128 is used by the library 36 | delay(500); 37 | scale.begin(26, 33); // DO,CK 38 | if (goToSetup == 0) calibrate(); 39 | scale.set_scale(20099.f); // this value is obtained by calibrating the scale with known weights; see the README for details 40 | scale.tare(); // reset the scale to 0 41 | Firebase.setFloat("Weight", 0.0); 42 | // handle error 43 | if (Firebase.failed()) { 44 | Serial.print("setting /number failed:"); 45 | Serial.println(Firebase.error()); 46 | return; 47 | } 48 | } 49 | 50 | void loop() { 51 | float averageWeight = scale.get_units(10); 52 | if ( digitalRead(SETUPPIN) == 0) scale.tare(); 53 | Serial.print("one reading:\t"); 54 | Serial.print(scale.get_units(1), 1); 55 | Serial.print("\t| average:\t"); 56 | Serial.println(averageWeight, 1); 57 | 58 | Firebase.pushFloat("Weight", averageWeight); 59 | // handle error 60 | if (Firebase.failed()) { 61 | Serial.print("setting /number failed:"); 62 | Serial.println(Firebase.error()); 63 | return; 64 | } 65 | Serial.println("Published"); 66 | scale.power_down(); // put the ADC in sleep mode 67 | delay(10000); 68 | scale.power_up(); 69 | } 70 | 71 | void calibrate() { 72 | Serial.println("Calibrate"); 73 | Serial.println("Remove all weight and press button"); 74 | Firebase.pushFloat("Remove all weight and press button", 0.0); 75 | waitForKeyPressed(); 76 | scale.set_scale(); 77 | scale.tare(); 78 | Serial.println("Put known weight on and press the button again"); 79 | Firebase.pushFloat("Put known weight on and press the button again", 0.0); 80 | waitForKeyPressed(); 81 | 82 | Serial.print("Weight "); 83 | 84 | float hi = Serial.print(scale.get_units(10)); 85 | 86 | Serial.println(hi); 87 | Firebase.pushFloat("constant", hi); 88 | Firebase.pushFloat("Divide this value to the weight and insert it in the scale.set_scale() statement", 0); 89 | Firebase.pushFloat(" Reset the microprocessor", 0); 90 | while (1 == 1)Serial.println("Waiting"); 91 | 92 | } 93 | 94 | void waitForKeyPressed() { 95 | while (digitalRead(SETUPPIN) == 1) delay(10); 96 | while (digitalRead(SETUPPIN) == 0) delay(10); 97 | Serial.println("Key pressed"); 98 | 99 | } 100 | -------------------------------------------------------------------------------- /ESP32_IKEA_Firebase/Wiring of Load Cells.JPG: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/SensorsIot/Weight-Sensors/1df69ee81c62a4de2520fe2b1ea780bc161871f3/ESP32_IKEA_Firebase/Wiring of Load Cells.JPG -------------------------------------------------------------------------------- /ESP32_IKEA_Firebase/desktop.ini: -------------------------------------------------------------------------------- 1 | [LocalizedFileNames] 2 | Connections of the Load Cells to the HX711 modules.JPG=@Connections of the Load Cells to the HX711 modules.JPG,0 3 | -------------------------------------------------------------------------------- /HX711/.gitignore: -------------------------------------------------------------------------------- 1 | # Compiled Object files 2 | *.slo 3 | *.lo 4 | *.o 5 | 6 | # Compiled Dynamic libraries 7 | *.so 8 | *.dylib 9 | 10 | # Compiled Static libraries 11 | *.lai 12 | *.la 13 | *.a 14 | -------------------------------------------------------------------------------- /HX711/.travis.yml: -------------------------------------------------------------------------------- 1 | language: python 2 | python: 3 | - "2.7" 4 | 5 | # Cache PlatformIO packages using Travis CI container-based infrastructure 6 | sudo: false 7 | cache: 8 | directories: 9 | - "~/.platformio" 10 | 11 | env: 12 | - PLATFORMIO_CI_SRC=examples/HX711Serial 13 | - PLATFORMIO_CI_SRC=examples/HX711SerialBegin 14 | 15 | install: 16 | - pip install -U platformio 17 | 18 | script: 19 | - platformio ci --board=megaatmega2560 --lib="." 20 | -------------------------------------------------------------------------------- /HX711/HX711.cpp: -------------------------------------------------------------------------------- 1 | #include 2 | #include 3 | /* 4 | #if ARDUINO_VERSION <= 106 5 | // "yield" is not implemented as noop in older Arduino Core releases, so let's define it. 6 | // See also: https://stackoverflow.com/questions/34497758/what-is-the-secret-of-the-arduino-yieldfunction/34498165#34498165 7 | void yield(void) {}; 8 | #endif 9 | */ 10 | HX711::HX711(byte dout, byte pd_sck, byte gain) { 11 | begin(dout, pd_sck, gain); 12 | } 13 | 14 | HX711::HX711() { 15 | } 16 | 17 | HX711::~HX711() { 18 | } 19 | 20 | void HX711::begin(byte dout, byte pd_sck, byte gain) { 21 | PD_SCK = pd_sck; 22 | DOUT = dout; 23 | 24 | pinMode(PD_SCK, OUTPUT); 25 | pinMode(DOUT, INPUT); 26 | 27 | set_gain(gain); 28 | } 29 | 30 | bool HX711::is_ready() { 31 | return digitalRead(DOUT) == LOW; 32 | } 33 | 34 | void HX711::set_gain(byte gain) { 35 | switch (gain) { 36 | case 128: // channel A, gain factor 128 37 | GAIN = 1; 38 | break; 39 | case 64: // channel A, gain factor 64 40 | GAIN = 3; 41 | break; 42 | case 32: // channel B, gain factor 32 43 | GAIN = 2; 44 | break; 45 | } 46 | 47 | digitalWrite(PD_SCK, LOW); 48 | read(); 49 | } 50 | 51 | long HX711::read() { 52 | // wait for the chip to become ready 53 | while (!is_ready()) { 54 | // Will do nothing on Arduino but prevent resets of ESP8266 (Watchdog Issue) 55 | yield(); 56 | } 57 | 58 | unsigned long value = 0; 59 | uint8_t data[3] = { 0 }; 60 | uint8_t filler = 0x00; 61 | //rtc_clk_cpu_freq_set(RTC_CPU_FREQ_80M); 62 | // pulse the clock pin 24 times to read the data 63 | data[2] = shiftIn(DOUT, PD_SCK, MSBFIRST); 64 | data[1] = shiftIn(DOUT, PD_SCK, MSBFIRST); 65 | data[0] = shiftIn(DOUT, PD_SCK, MSBFIRST); 66 | // rtc_clk_cpu_freq_set(RTC_CPU_FREQ_240M); 67 | 68 | // set the channel and the gain factor for the next reading using the clock pin 69 | for (unsigned int i = 0; i < GAIN; i++) { 70 | digitalWrite(PD_SCK, HIGH); 71 | digitalWrite(PD_SCK, LOW); 72 | } 73 | 74 | // Replicate the most significant bit to pad out a 32-bit signed integer 75 | if (data[2] & 0x80) { 76 | filler = 0xFF; 77 | } else { 78 | filler = 0x00; 79 | } 80 | 81 | // Construct a 32-bit signed integer 82 | value = ( static_cast(filler) << 24 83 | | static_cast(data[2]) << 16 84 | | static_cast(data[1]) << 8 85 | | static_cast(data[0]) ); 86 | 87 | return static_cast(value); 88 | } 89 | 90 | long HX711::read_average(byte times) { 91 | long sum = 0; 92 | for (byte i = 0; i < times; i++) { 93 | sum += read(); 94 | yield(); 95 | } 96 | return sum / times; 97 | } 98 | 99 | double HX711::get_value(byte times) { 100 | return read_average(times) - OFFSET; 101 | } 102 | 103 | float HX711::get_units(byte times) { 104 | return get_value(times) / SCALE; 105 | } 106 | 107 | void HX711::tare(byte times) { 108 | double sum = read_average(times); 109 | set_offset(sum); 110 | } 111 | 112 | void HX711::set_scale(float scale) { 113 | SCALE = scale; 114 | } 115 | 116 | float HX711::get_scale() { 117 | return SCALE; 118 | } 119 | 120 | void HX711::set_offset(long offset) { 121 | OFFSET = offset; 122 | } 123 | 124 | long HX711::get_offset() { 125 | return OFFSET; 126 | } 127 | 128 | void HX711::power_down() { 129 | digitalWrite(PD_SCK, LOW); 130 | digitalWrite(PD_SCK, HIGH); 131 | } 132 | 133 | void HX711::power_up() { 134 | digitalWrite(PD_SCK, LOW); 135 | } 136 | -------------------------------------------------------------------------------- /HX711/HX711.h: -------------------------------------------------------------------------------- 1 | #ifndef HX711_h 2 | #define HX711_h 3 | 4 | #if ARDUINO >= 100 5 | #include "Arduino.h" 6 | #else 7 | #include "WProgram.h" 8 | #endif 9 | 10 | class HX711 11 | { 12 | private: 13 | byte PD_SCK; // Power Down and Serial Clock Input Pin 14 | byte DOUT; // Serial Data Output Pin 15 | byte GAIN; // amplification factor 16 | long OFFSET = 0; // used for tare weight 17 | float SCALE = 1; // used to return weight in grams, kg, ounces, whatever 18 | 19 | public: 20 | // define clock and data pin, channel, and gain factor 21 | // channel selection is made by passing the appropriate gain: 128 or 64 for channel A, 32 for channel B 22 | // gain: 128 or 64 for channel A; channel B works with 32 gain factor only 23 | HX711(byte dout, byte pd_sck, byte gain = 128); 24 | 25 | HX711(); 26 | 27 | virtual ~HX711(); 28 | 29 | // Allows to set the pins and gain later than in the constructor 30 | void begin(byte dout, byte pd_sck, byte gain = 128); 31 | 32 | // check if HX711 is ready 33 | // from the datasheet: When output data is not ready for retrieval, digital output pin DOUT is high. Serial clock 34 | // input PD_SCK should be low. When DOUT goes to low, it indicates data is ready for retrieval. 35 | bool is_ready(); 36 | 37 | // set the gain factor; takes effect only after a call to read() 38 | // channel A can be set for a 128 or 64 gain; channel B has a fixed 32 gain 39 | // depending on the parameter, the channel is also set to either A or B 40 | void set_gain(byte gain = 128); 41 | 42 | // waits for the chip to be ready and returns a reading 43 | long read(); 44 | 45 | // returns an average reading; times = how many times to read 46 | long read_average(byte times = 10); 47 | 48 | // returns (read_average() - OFFSET), that is the current value without the tare weight; times = how many readings to do 49 | double get_value(byte times = 1); 50 | 51 | // returns get_value() divided by SCALE, that is the raw value divided by a value obtained via calibration 52 | // times = how many readings to do 53 | float get_units(byte times = 1); 54 | 55 | // set the OFFSET value for tare weight; times = how many times to read the tare value 56 | void tare(byte times = 10); 57 | 58 | // set the SCALE value; this value is used to convert the raw data to "human readable" data (measure units) 59 | void set_scale(float scale = 1.f); 60 | 61 | // get the current SCALE 62 | float get_scale(); 63 | 64 | // set OFFSET, the value that's subtracted from the actual reading (tare weight) 65 | void set_offset(long offset = 0); 66 | 67 | // get the current OFFSET 68 | long get_offset(); 69 | 70 | // puts the chip into power down mode 71 | void power_down(); 72 | 73 | // wakes up the chip after power down mode 74 | void power_up(); 75 | }; 76 | 77 | #endif /* HX711_h */ 78 | -------------------------------------------------------------------------------- /HX711/LICENSE: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 2, June 1991 3 | 4 | Copyright (C) 1989, 1991 Free Software Foundation, Inc., 5 | 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 6 | Everyone is permitted to copy and distribute verbatim copies 7 | of this license document, but changing it is not allowed. 8 | 9 | Preamble 10 | 11 | The licenses for most software are designed to take away your 12 | freedom to share and change it. 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If this is what you want to do, use the GNU Lesser General 339 | Public License instead of this License. 340 | -------------------------------------------------------------------------------- /HX711/README.md: -------------------------------------------------------------------------------- 1 | HX711 2 | ===== 3 | 4 | An Arduino library to interface the Avia Semiconductor HX711 24-Bit Analog-to-Digital Converter (ADC) for Weight Scales. 5 | 6 | This is my humble attempt at creating an Arduino library for this ADC: 7 | http://www.dfrobot.com/image/data/SEN0160/hx711_english.pdf 8 | 9 | Other libraries exist, including this very good one, which I first used and which is the starting point for my library: 10 | https://github.com/aguegu/ardulibs/tree/master/hx711 11 | 12 | # Advantages of this library 13 | Although other libraries exist, I needed a slightly different approach, so here's how my library is different than others: 14 | 15 | 1. It provides a tare() function, which "resets" the scale to 0. Many other implementations calculate the tare weight when the ADC is initialized only. I needed a way to be able to set the tare weight at any time. Use case: place an empty container on the scale, call tare() to reset the readings to 0, fill the container and get the weight of the content. 16 | 17 | 2. It provides a power_down() function, to put the ADC into a low power mode. According to the datasheet, "When PD_SCK pin changes from low to high and stays at high for longer than 60μs, HX711 enters power down mode". Use case: battery powered scales. Accordingly, there is a power_up() function to get the chip out of the low power mode. 18 | 19 | 3. It has a set_gain(byte gain) function that allows you to set the gain factor and select the channel. According to the datasheet, "Channel A can be programmed with a gain of 128 or 64, corresponding to a full-scale differential input voltage of ±20mV or ±40mV respectively, when a 5V supply is connected to AVDD analog power supply pin. Channel B has a fixed gain of 32.". The same function is used to select the channel A or channel B, by passing 128 or 64 for channel A, or 32 for channel B as the parameter. The default value is 128, which means "channel A with a gain factor of 128", so one can simply call set_gain(). Also, the function is called from the constructor. 20 | 21 | 4. The constructor has an extra parameter "gain" that allows you to set the gain factor and channel. The constructor calls the "set_gain" function mentioned above. 22 | 23 | 5. The "get_value" and "get_units" functions can receive an extra parameter "times", and they will return the average of multiple readings instead of a single reading. 24 | 25 | # How to Calibrate Your Scale 26 | 27 | 1. Call set_scale() with no parameter. 28 | 2. Call tare() with no parameter. 29 | 3. Place a known weight on the scale and call get_units(10). 30 | 4. Divide the result in step 3 to your known weight. You should get about the parameter you need to pass to set_scale. 31 | 5. Adjust the parameter in step 4 until you get an accurate reading. 32 | 33 | # How to use 34 | See the example in examples/HX711SerialBegin. Please don't use examples/HX711Serial anymore. It is deprecated because the pin definition within the constructor 35 | is not timing safe. (#29) 36 | -------------------------------------------------------------------------------- /HX711/examples/HX711Serial/HX711Serial.ino: -------------------------------------------------------------------------------- 1 | #include "HX711.h" 2 | 3 | // HX711.DOUT - pin #A1 4 | // HX711.PD_SCK - pin #A0 5 | 6 | HX711 scale(A1, A0); // parameter "gain" is ommited; the default value 128 is used by the library 7 | 8 | void setup() { 9 | Serial.begin(38400); 10 | Serial.println("HX711 Demo"); 11 | 12 | Serial.println("Before setting up the scale:"); 13 | Serial.print("read: \t\t"); 14 | Serial.println(scale.read()); // print a raw reading from the ADC 15 | 16 | Serial.print("read average: \t\t"); 17 | Serial.println(scale.read_average(20)); // print the average of 20 readings from the ADC 18 | 19 | Serial.print("get value: \t\t"); 20 | Serial.println(scale.get_value(5)); // print the average of 5 readings from the ADC minus the tare weight (not set yet) 21 | 22 | Serial.print("get units: \t\t"); 23 | Serial.println(scale.get_units(5), 1); // print the average of 5 readings from the ADC minus tare weight (not set) divided 24 | // by the SCALE parameter (not set yet) 25 | 26 | scale.set_scale(2280.f); // this value is obtained by calibrating the scale with known weights; see the README for details 27 | scale.tare(); // reset the scale to 0 28 | 29 | Serial.println("After setting up the scale:"); 30 | 31 | Serial.print("read: \t\t"); 32 | Serial.println(scale.read()); // print a raw reading from the ADC 33 | 34 | Serial.print("read average: \t\t"); 35 | Serial.println(scale.read_average(20)); // print the average of 20 readings from the ADC 36 | 37 | Serial.print("get value: \t\t"); 38 | Serial.println(scale.get_value(5)); // print the average of 5 readings from the ADC minus the tare weight, set with tare() 39 | 40 | Serial.print("get units: \t\t"); 41 | Serial.println(scale.get_units(5), 1); // print the average of 5 readings from the ADC minus tare weight, divided 42 | // by the SCALE parameter set with set_scale 43 | 44 | Serial.println("Readings:"); 45 | } 46 | 47 | void loop() { 48 | Serial.print("one reading:\t"); 49 | Serial.print(scale.get_units(), 1); 50 | Serial.print("\t| average:\t"); 51 | Serial.println(scale.get_units(10), 1); 52 | 53 | scale.power_down(); // put the ADC in sleep mode 54 | delay(5000); 55 | scale.power_up(); 56 | } -------------------------------------------------------------------------------- /HX711/examples/HX711SerialBegin/HX711SerialBegin.ino: -------------------------------------------------------------------------------- 1 | #include "HX711.h" 2 | 3 | HX711 scale; 4 | 5 | void setup() { 6 | Serial.begin(38400); 7 | Serial.println("HX711 Demo"); 8 | 9 | Serial.println("Initializing the scale"); 10 | // parameter "gain" is ommited; the default value 128 is used by the library 11 | // HX711.DOUT - pin #A1 12 | // HX711.PD_SCK - pin #A0 13 | scale.begin(A1, A0); 14 | 15 | Serial.println("Before setting up the scale:"); 16 | Serial.print("read: \t\t"); 17 | Serial.println(scale.read()); // print a raw reading from the ADC 18 | 19 | Serial.print("read average: \t\t"); 20 | Serial.println(scale.read_average(20)); // print the average of 20 readings from the ADC 21 | 22 | Serial.print("get value: \t\t"); 23 | Serial.println(scale.get_value(5)); // print the average of 5 readings from the ADC minus the tare weight (not set yet) 24 | 25 | Serial.print("get units: \t\t"); 26 | Serial.println(scale.get_units(5), 1); // print the average of 5 readings from the ADC minus tare weight (not set) divided 27 | // by the SCALE parameter (not set yet) 28 | 29 | scale.set_scale(2280.f); // this value is obtained by calibrating the scale with known weights; see the README for details 30 | scale.tare(); // reset the scale to 0 31 | 32 | Serial.println("After setting up the scale:"); 33 | 34 | Serial.print("read: \t\t"); 35 | Serial.println(scale.read()); // print a raw reading from the ADC 36 | 37 | Serial.print("read average: \t\t"); 38 | Serial.println(scale.read_average(20)); // print the average of 20 readings from the ADC 39 | 40 | Serial.print("get value: \t\t"); 41 | Serial.println(scale.get_value(5)); // print the average of 5 readings from the ADC minus the tare weight, set with tare() 42 | 43 | Serial.print("get units: \t\t"); 44 | Serial.println(scale.get_units(5), 1); // print the average of 5 readings from the ADC minus tare weight, divided 45 | // by the SCALE parameter set with set_scale 46 | 47 | Serial.println("Readings:"); 48 | } 49 | 50 | void loop() { 51 | Serial.print("one reading:\t"); 52 | Serial.print(scale.get_units(), 1); 53 | Serial.print("\t| average:\t"); 54 | Serial.println(scale.get_units(10), 1); 55 | 56 | scale.power_down(); // put the ADC in sleep mode 57 | delay(5000); 58 | scale.power_up(); 59 | } 60 | -------------------------------------------------------------------------------- /HX711/library.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "HX711", 3 | "keywords": "hx711, scale, weight", 4 | "description": "An Arduino library to interface the Avia Semiconductor HX711 24-Bit Analog-to-Digital Converter (ADC) for Weight Scales.", 5 | "repository": { 6 | "type": "git", 7 | "url": "https://github.com/bogde/HX711.git" 8 | }, 9 | "version": "0.1", 10 | "exclude": "tests", 11 | "examples": "examples/*/*.ino", 12 | "frameworks": "arduino", 13 | "platforms": [ 14 | "atmelavr", 15 | "espressif" 16 | ] 17 | } 18 | -------------------------------------------------------------------------------- /Node-Red Flow.txt: -------------------------------------------------------------------------------- 1 | [ 2 | { 3 | "id": "11518659.18be7a", 4 | "type": "tab", 5 | "label": "Cat Feeder Alarm" 6 | }, 7 | { 8 | "id": "bd626c23.40f", 9 | "type": "twitter out", 10 | "z": "11518659.18be7a", 11 | "twitter": "", 12 | "name": "Tweet", 13 | "x": 1085, 14 | "y": 182, 15 | "wires": [] 16 | }, 17 | { 18 | "id": "fe159cfc.c2921", 19 | "type": "mqtt in", 20 | "z": "11518659.18be7a", 21 | "name": "Dishka", 22 | "topic": "cat/bowl", 23 | "qos": "0", 24 | "broker": "d0e87662.1eee38", 25 | "x": 303, 26 | "y": 218, 27 | "wires": [ 28 | [ 29 | "a2914141.28af4", 30 | "319d150f.7e308a" 31 | ] 32 | ] 33 | }, 34 | { 35 | "id": "a2914141.28af4", 36 | "type": "debug", 37 | "z": "11518659.18be7a", 38 | "name": "", 39 | "active": true, 40 | "console": "false", 41 | "complete": "false", 42 | "x": 512, 43 | "y": 281, 44 | "wires": [] 45 | }, 46 | { 47 | "id": "319d150f.7e308a", 48 | "type": "switch", 49 | "z": "11518659.18be7a", 50 | "name": "", 51 | "property": "payload", 52 | "propertyType": "msg", 53 | "rules": [ 54 | { 55 | "t": "lte", 56 | "v": "4", 57 | "vt": "num" 58 | } 59 | ], 60 | "checkall": "true", 61 | "outputs": 1, 62 | "x": 640, 63 | "y": 145, 64 | "wires": [ 65 | [ 66 | "77a35414.0bc7fc" 67 | ] 68 | ] 69 | }, 70 | { 71 | "id": "b25fb874.f39628", 72 | "type": "debug", 73 | "z": "11518659.18be7a", 74 | "name": "", 75 | "active": true, 76 | "console": "false", 77 | "complete": "false", 78 | "x": 1099, 79 | "y": 85, 80 | "wires": [] 81 | }, 82 | { 83 | "id": "77a35414.0bc7fc", 84 | "type": "trigger", 85 | "z": "11518659.18be7a", 86 | "op1": "@spiessa Diska is really hugry", 87 | "op2": "", 88 | "op1type": "str", 89 | "op2type": "str", 90 | "duration": "1", 91 | "extend": true, 92 | "units": "hr", 93 | "reset": "", 94 | "name": "", 95 | "x": 830, 96 | "y": 145, 97 | "wires": [ 98 | [ 99 | "bd626c23.40f", 100 | "b25fb874.f39628" 101 | ] 102 | ] 103 | }, 104 | { 105 | "id": "d0e87662.1eee38", 106 | "type": "mqtt-broker", 107 | "z": "", 108 | "broker": "192.168.0.203", 109 | "port": "1883", 110 | "clientid": "", 111 | "usetls": false, 112 | "compatmode": true, 113 | "keepalive": "60", 114 | "cleansession": true, 115 | "willTopic": "", 116 | "willQos": "0", 117 | "willPayload": "", 118 | "birthTopic": "", 119 | "birthQos": "0", 120 | "birthPayload": "" 121 | } 122 | ] -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Weight-Sensors 2 | 3 | accompanying documents for YouTube Video: https://www.youtube.com/watch?v=iywsJB-T-mU 4 | --------------------------------------------------------------------------------