├── README.md
├── LICENSE
└── anavi-gas-detector-sw
    └── anavi-gas-detector-sw.ino


/README.md:
--------------------------------------------------------------------------------
 1 | # ANAVI Gas Detector Default Arduino Sketch
 2 | 
 3 | Open source Arduino sketch for the smart WiFi dev board ANAVI Gas Detector for [MQ gas sensors](https://playground.arduino.cc/Main/MQGasSensors/).
 4 | 
 5 | ANAVI Gas Detector is an open source, easy-to-use, Wi-Fi compatible development board for monitoring air quality and detecting dangerous gases. It supports popular analog MQ gas sensor modules such as MQ-135, MQ-2, MQ-3, etc. Furthermore, it comes with slots for mini OLED display and up to three additional I²C sensor modules, including the precise digital sensor HTU21D for measuring temperature and humidity.
 6 | 
 7 | Air pollution is a very serious problem. Monitoring air quality and detecting toxic gases can improve one’s quality of life. All these features make ANAVI Gas Detector appropriate for developers, makers, students and open source enthusiasts who are interested in home automation and an environmentally friendly lifestyle.
 8 | 
 9 | # User's Manual
10 | 
11 | [ANAVI Gas Detector User's Manual](https://github.com/AnaviTechnology/anavi-docs/blob/master/anavi-gas-detector/anavi-gas-detector.md)
12 | 
13 | # Dependencies
14 | 
15 | The default firmware of ANAVI Gas Detector depends on the following Arduino libraries:
16 | 
17 | * [WiFiManager by tzapu](https://github.com/tzapu/WiFiManager) (version 0.15.0)
18 | * [ArduinoJson by Benoit Blanchon](https://arduinojson.org/) (version 6.11.2)
19 | * [PubSubClient by Nick O'Leary](https://pubsubclient.knolleary.net/) (version 2.7.0)
20 | * [Adafruit HTU21DF Library by Adafruit](https://github.com/adafruit/Adafruit_HTU21DF_Library) (version 1.0.1)
21 | * [Adafruit APDS9960 Library by Adafruit](https://github.com/adafruit/Adafruit_APDS9960) (version 1.0.5)
22 | * [DHT sensor library by Adafruit](https://github.com/adafruit/DHT-sensor-library) (version 1.3.4)
23 | * [U8g2 by oliver](https://github.com/olikraus/u8g2) (version 2.23.18)
24 | * [OneWire](https://github.com/PaulStoffregen/OneWire) (version 2.3.4)
25 | * [DallasTemperature](https://github.com/milesburton/Arduino-Temperature-Control-Library) (version 3.8.0)
26 | * [Adafruit Unified Sensor by Adafruit](https://github.com/adafruit/Adafruit_Sensor) (version 1.0.2)
27 | * [Adafruit BMP085 Unified](https://github.com/adafruit/Adafruit_BMP085_Unified) (version 1.0.0)
28 | * [NTPClient by Fabrice Weinberg](https://github.com/arduino-libraries/NTPClient) (version 3.1.0)
29 | 


--------------------------------------------------------------------------------
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650 | Also add information on how to contact you by electronic and paper mail.
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671 | may consider it more useful to permit linking proprietary applications with
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673 | Public License instead of this License.  But first, please read
674 | <https://www.gnu.org/licenses/why-not-lgpl.html>.
675 | 


--------------------------------------------------------------------------------
/anavi-gas-detector-sw/anavi-gas-detector-sw.ino:
--------------------------------------------------------------------------------
   1 | // -*- mode: c++; indent-tabs-mode: nil; c-file-style: "stroustrup" -*-
   2 | #include <FS.h>                   //this needs to be first, or it all crashes and burns...
   3 | 
   4 | // If HOME_ASSISTANT_DISCOVERY is defined, the Anavi Gas Detector will
   5 | // publish MQTT messages that makes Home Assistant auto-discover the
   6 | // device.  See https://www.home-assistant.io/docs/mqtt/discovery/.
   7 | //
   8 | // This requires PubSubClient 2.7.
   9 | 
  10 | #define HOME_ASSISTANT_DISCOVERY 1
  11 | 
  12 | // If DEBUG is defined additional message will be printed in serial console
  13 | #undef DEBUG
  14 | 
  15 | // If PUBLISH_CHIP_ID is defined, the Anavi Gas Detector will publish
  16 | // the chip ID using MQTT.  This can be considered a privacy issue,
  17 | // and is disabled by default.
  18 | #undef PUBLISH_CHIP_ID
  19 | 
  20 | // Should Over-the-Air upgrades be supported?  They are only supported
  21 | // if this define is set, and the user configures an OTA server on the
  22 | // wifi configuration page (or defines OTA_SERVER below).  If you use
  23 | // OTA you are strongly adviced to use signed builds (see
  24 | // https://arduino-esp8266.readthedocs.io/en/2.5.0/ota_updates/readme.html#advanced-security-signed-updates)
  25 | //
  26 | // You perform an OTA upgrade by publishing a MQTT command, like
  27 | // this:
  28 | //
  29 | //   mosquitto_pub -h mqtt-server.example.com \
  30 | //     -t cmnd/$MACHINEID/update \
  31 | //     -m '{"file": "/anavi.bin", "server": "www.example.com", "port": 8080 }'
  32 | //
  33 | // The port defaults to 80.
  34 | #define OTA_UPGRADES 1
  35 | // #define OTA_SERVER "www.example.com"
  36 | 
  37 | #include <ESP8266WiFi.h>          //https://github.com/esp8266/Arduino
  38 | #include <ESP8266httpUpdate.h>
  39 | 
  40 | //needed for library
  41 | #include <DNSServer.h>
  42 | #include <ESP8266WebServer.h>
  43 | #include <WiFiManager.h>          //https://github.com/tzapu/WiFiManager
  44 | 
  45 | #include <ArduinoJson.h>          //https://github.com/bblanchon/ArduinoJson
  46 | 
  47 | #include <PubSubClient.h>        //https://github.com/knolleary/pubsubclient
  48 | 
  49 | #include <MD5Builder.h>
  50 | // For OLED display
  51 | #include <U8g2lib.h>
  52 | #include <Wire.h>
  53 | #include "Adafruit_HTU21DF.h"
  54 | #include "Adafruit_APDS9960.h"
  55 | // For BMP180
  56 | #include <Adafruit_Sensor.h>
  57 | #include <Adafruit_BMP085_U.h>
  58 | 
  59 | U8G2_SSD1306_128X64_NONAME_F_HW_I2C u8g2(U8G2_R0, /* reset=*/ U8X8_PIN_NONE);
  60 | 
  61 | Adafruit_BMP085_Unified bmp = Adafruit_BMP085_Unified(10085);
  62 | 
  63 | Adafruit_HTU21DF htu = Adafruit_HTU21DF();
  64 | 
  65 | Adafruit_APDS9960 apds;
  66 | 
  67 | //Configure supported I2C sensors
  68 | const int sensorHTU21D =  0x40;
  69 | const int sensorBH1750 = 0x23;
  70 | const int sensorBMP180 = 0x77;
  71 | const int i2cDisplayAddress = 0x3c;
  72 | 
  73 | // Configure pins
  74 | const int pinAlarm = 16;
  75 | const int pinButton = 0;
  76 | const int pinCustom = 2;
  77 | const int pinGreen = 13;
  78 | const int pinYellow = 12;
  79 | const int pinRed = 14;
  80 | const int pinAdc = 0;
  81 | 
  82 | unsigned long sensorPreviousMillis = 0;
  83 | const long sensorInterval = 3000;
  84 | unsigned long gasPreviousMillis = 0;
  85 | const long gasInterval = 1000;
  86 | 
  87 | // Last known good values for air quality and
  88 | // gas concentration (through air conductivity)
  89 | String prevQuality = "";
  90 | int prevConductivity = 0;
  91 | int prevGas = -1;
  92 | 
  93 | unsigned long mqttConnectionPreviousMillis = millis();
  94 | const long mqttConnectionInterval = 60000;
  95 | 
  96 | bool isTempSensorAttached = false;
  97 | float sensorTemperature = 0;
  98 | float sensorHumidity = 0;
  99 | uint16_t sensorAmbientLight = 0;
 100 | 
 101 | bool isPressureSensorAttached = false;
 102 | float sensorBmpTemperature = 0;
 103 | 
 104 | //define your default values here, if there are different values in config.json, they are overwritten.
 105 | char mqtt_server[40] = "mqtt.eclipse.org";
 106 | char mqtt_port[6] = "1883";
 107 | char workgroup[32] = "workgroup";
 108 | // MQTT username and password
 109 | char username[20] = "";
 110 | char password[20] = "";
 111 | #ifdef HOME_ASSISTANT_DISCOVERY
 112 | char ha_name[32+1] = "";        // Make sure the machineId fits.
 113 | #endif
 114 | #ifdef OTA_UPGRADES
 115 | char ota_server[40];
 116 | #endif
 117 | char temp_scale[40] = "celsius";
 118 | 
 119 | // Set the temperature in Celsius or Fahrenheit
 120 | // true - Celsius, false - Fahrenheit
 121 | bool configTempCelsius = true;
 122 | 
 123 | // MD5 of chip ID.  If you only have a handful of gas detectors and
 124 | // use your own MQTT broker (instead of iot.eclips.org) you may want
 125 | // to truncate the MD5 by changing the 32 to a smaller value.
 126 | char machineId[32+1] = "";
 127 | 
 128 | //flag for saving data
 129 | bool shouldSaveConfig = false;
 130 | 
 131 | // MQTT
 132 | WiFiClient espClient;
 133 | PubSubClient mqttClient(espClient);
 134 | 
 135 | #ifdef OTA_UPGRADES
 136 | char cmnd_update_topic[12 + sizeof(machineId)];
 137 | #endif
 138 | 
 139 | char line1_topic[11 + sizeof(machineId)];
 140 | char line2_topic[11 + sizeof(machineId)];
 141 | char line3_topic[11 + sizeof(machineId)];
 142 | char cmnd_temp_coefficient_topic[14 + sizeof(machineId)];
 143 | char cmnd_temp_format[16 + sizeof(machineId)];
 144 | 
 145 | // The display can fit 26 "i":s on a single line.  It will fit even
 146 | // less of other characters.
 147 | char mqtt_line1[26+1];
 148 | char mqtt_line2[26+1];
 149 | char mqtt_line3[26+1];
 150 | 
 151 | String sensor_line1;
 152 | String sensor_line2;
 153 | String sensor_line3;
 154 | 
 155 | bool need_redraw = false;
 156 | 
 157 | //callback notifying us of the need to save config
 158 | void saveConfigCallback ()
 159 | {
 160 |     Serial.println("Should save config");
 161 |     shouldSaveConfig = true;
 162 | }
 163 | 
 164 | void drawDisplay(const char *line1, const char *line2 = "", const char *line3 = "")
 165 | {
 166 |     // Write on OLED display
 167 |     // Clear the internal memory
 168 |     u8g2.clearBuffer();
 169 |     // Set appropriate font
 170 |     u8g2.setFont(u8g2_font_ncenR14_tr);
 171 |     u8g2.drawStr(0,14, line1);
 172 |     u8g2.setFont(u8g2_font_ncenR10_tr);
 173 |     u8g2.drawStr(0,39, line2);
 174 |     u8g2.drawStr(0,60, line3);
 175 |     // Transfer internal memory to the display
 176 |     u8g2.sendBuffer();
 177 | }
 178 | 
 179 | void setColor(bool red, bool yellow, bool green)
 180 | {
 181 |   digitalWrite(pinRed, red);
 182 |   digitalWrite(pinYellow, yellow);
 183 |   digitalWrite(pinGreen, green);
 184 | }
 185 | 
 186 | void apWiFiCallback(WiFiManager *myWiFiManager)
 187 | {
 188 |     String configPortalSSID = myWiFiManager->getConfigPortalSSID();
 189 |     // Print information in the serial output
 190 |     Serial.print("Created access point for configuration: ");
 191 |     Serial.println(configPortalSSID);
 192 |     // Show information on the display
 193 |     String apId = configPortalSSID.substring(configPortalSSID.length()-5);
 194 |     String configHelper("AP ID: "+apId);
 195 |     drawDisplay("Gas Detector", "Please configure", configHelper.c_str());
 196 | }
 197 | 
 198 | void saveConfig()
 199 | {
 200 |     Serial.println("Saving configurations to file.");
 201 |     DynamicJsonDocument json(1024);
 202 |     json["mqtt_server"] = mqtt_server;
 203 |     json["mqtt_port"] = mqtt_port;
 204 |     json["workgroup"] = workgroup;
 205 |     json["username"] = username;
 206 |     json["password"] = password;
 207 |     json["temp_scale"] = temp_scale;
 208 | #ifdef HOME_ASSISTANT_DISCOVERY
 209 |     json["ha_name"] = ha_name;
 210 | #endif
 211 | #ifdef OTA_UPGRADES
 212 |     json["ota_server"] = ota_server;
 213 | #endif
 214 | 
 215 |     File configFile = SPIFFS.open("/config.json", "w");
 216 |     if (!configFile)
 217 |     {
 218 |         Serial.println("ERROR: failed to open config file for writing");
 219 |         return;
 220 |     }
 221 | 
 222 |     serializeJson(json, Serial);
 223 |     serializeJson(json, configFile);
 224 |     configFile.close();
 225 | }
 226 | 
 227 | void checkDisplay()
 228 | {
 229 |     Serial.print("Mini I2C OLED Display at address ");
 230 |     Serial.print(i2cDisplayAddress, HEX);
 231 |     if (isSensorAvailable(i2cDisplayAddress))
 232 |     {
 233 |         Serial.println(": OK");
 234 |     }
 235 |     else
 236 |     {
 237 |         Serial.println(": N/A");
 238 |     }
 239 | }
 240 | 
 241 | void setup()
 242 | {
 243 |     // put your setup code here, to run once:
 244 |     strcpy(mqtt_line1, "");
 245 |     strcpy(mqtt_line2, "");
 246 |     strcpy(mqtt_line3, "");
 247 |     need_redraw = true;
 248 |     Serial.begin(115200);
 249 |     Serial.println();
 250 | 
 251 |     Wire.begin();
 252 |     checkDisplay();
 253 | 
 254 |     u8g2.begin();
 255 | 
 256 |     delay(10);
 257 | 
 258 |     //LEDs
 259 |     pinMode(pinAlarm, OUTPUT);
 260 |     pinMode(pinRed, OUTPUT);
 261 |     pinMode(pinYellow, OUTPUT);
 262 |     pinMode(pinGreen, OUTPUT);
 263 |     //Button
 264 |     pinMode(pinButton, INPUT);
 265 |     //Custom GPIO
 266 |     pinMode(pinCustom, OUTPUT);
 267 | 
 268 |     // Turn on the LEDs to visially verify
 269 |     // that they are working as expected
 270 |     setColor(HIGH, HIGH, HIGH);
 271 | 
 272 |     waitForFactoryReset();
 273 | 
 274 |     // Turn off the LEDs
 275 |     setColor(LOW, LOW, LOW);
 276 | 
 277 |     // Machine ID
 278 |     calculateMachineId();
 279 | 
 280 |     //read configuration from FS json
 281 |     Serial.println("mounting FS...");
 282 | 
 283 |     if (SPIFFS.begin())
 284 |     {
 285 |         Serial.println("mounted file system");
 286 |         if (SPIFFS.exists("/config.json")) {
 287 |             //file exists, reading and loading
 288 |             Serial.println("reading config file");
 289 |             File configFile = SPIFFS.open("/config.json", "r");
 290 |             if (configFile)
 291 |             {
 292 |                 Serial.println("opened config file");
 293 |                 const size_t size = configFile.size();
 294 |                 // Allocate a buffer to store contents of the file.
 295 |                 std::unique_ptr<char[]> buf(new char[size]);
 296 | 
 297 |                 configFile.readBytes(buf.get(), size);
 298 |                 DynamicJsonDocument json(1024);
 299 |                 if (DeserializationError::Ok == deserializeJson(json, buf.get()))
 300 |                 {
 301 | #ifdef DEBUG
 302 |                     // Content stored in the memory of the microcontroller contains
 303 |                     // sensitive data such as username and passwords therefore
 304 |                     // should be printed only during debugging
 305 |                     serializeJson(json, Serial);
 306 |                     Serial.println("\nparsed json");
 307 | #endif
 308 | 
 309 |                     strcpy(mqtt_server, json["mqtt_server"]);
 310 |                     strcpy(mqtt_port, json["mqtt_port"]);
 311 |                     strcpy(workgroup, json["workgroup"]);
 312 |                     strcpy(username, json["username"]);
 313 |                     strcpy(password, json["password"]);
 314 |                     {
 315 |                         const char *s = json["temp_scale"];
 316 |                         if (!s)
 317 |                             s = "celsius";
 318 |                         strcpy(temp_scale, s);
 319 |                     }
 320 | #ifdef HOME_ASSISTANT_DISCOVERY
 321 |                     {
 322 |                         const char *s = json["ha_name"];
 323 |                         if (!s)
 324 |                             s = machineId;
 325 |                         snprintf(ha_name, sizeof(ha_name), "%s", s);
 326 |                     }
 327 | #endif
 328 | #ifdef OTA_UPGRADES
 329 |                     {
 330 |                         const char *s = json["ota_server"];
 331 |                         if (!s)
 332 |                             s = ""; // The empty string never matches.
 333 |                         snprintf(ota_server, sizeof(ota_server), "%s", s);
 334 |                     }
 335 | #endif
 336 |                 }
 337 |                 else
 338 |                 {
 339 |                     Serial.println("failed to load json config");
 340 |                 }
 341 |             }
 342 |         }
 343 |     }
 344 |     else
 345 |     {
 346 |         Serial.println("failed to mount FS");
 347 |     }
 348 |     //end read
 349 | 
 350 |     // Set MQTT topics
 351 |     sprintf(line1_topic, "cmnd/%s/line1", machineId);
 352 |     sprintf(line2_topic, "cmnd/%s/line2", machineId);
 353 |     sprintf(line3_topic, "cmnd/%s/line3", machineId);
 354 |     sprintf(cmnd_temp_coefficient_topic, "cmnd/%s/tempcoef", machineId);
 355 |     sprintf(cmnd_temp_format, "cmnd/%s/tempformat", machineId);
 356 | #ifdef OTA_UPGRADES
 357 |     sprintf(cmnd_update_topic, "cmnd/%s/update", machineId);
 358 | #endif
 359 | 
 360 |     // The extra parameters to be configured (can be either global or just in the setup)
 361 |     // After connecting, parameter.getValue() will get you the configured value
 362 |     // id/name placeholder/prompt default length
 363 |     WiFiManagerParameter custom_mqtt_server("server", "mqtt server", mqtt_server, sizeof(mqtt_server));
 364 |     WiFiManagerParameter custom_mqtt_port("port", "mqtt port", mqtt_port, sizeof(mqtt_port));
 365 |     WiFiManagerParameter custom_workgroup("workgroup", "workgroup", workgroup, sizeof(workgroup));
 366 |     WiFiManagerParameter custom_mqtt_user("user", "MQTT username", username, sizeof(username));
 367 |     WiFiManagerParameter custom_mqtt_pass("pass", "MQTT password", password, sizeof(password));
 368 | #ifdef HOME_ASSISTANT_DISCOVERY
 369 |     WiFiManagerParameter custom_mqtt_ha_name("ha_name", "Sensor name for Home Assistant", ha_name, sizeof(ha_name));
 370 | #endif
 371 | #ifdef OTA_UPGRADES
 372 |     WiFiManagerParameter custom_ota_server("ota_server", "OTA server", ota_server, sizeof(ota_server));
 373 | #endif
 374 |     WiFiManagerParameter custom_temperature_scale("temp_scale", "Temperature scale", temp_scale, sizeof(temp_scale));
 375 | 
 376 |     char htmlMachineId[200];
 377 |     sprintf(htmlMachineId,"<p style=\"color: red;\">Machine ID:</p><p><b>%s</b></p><p>Copy and save the machine ID because you will need it to control the device.</p>", machineId);
 378 |     WiFiManagerParameter custom_text_machine_id(htmlMachineId);
 379 | 
 380 |     //WiFiManager
 381 |     //Local intialization. Once its business is done, there is no need to keep it around
 382 |     WiFiManager wifiManager;
 383 | 
 384 |     //set config save notify callback
 385 |     wifiManager.setSaveConfigCallback(saveConfigCallback);
 386 | 
 387 |     //add all your parameters here
 388 |     wifiManager.addParameter(&custom_mqtt_server);
 389 |     wifiManager.addParameter(&custom_mqtt_port);
 390 |     wifiManager.addParameter(&custom_workgroup);
 391 |     wifiManager.addParameter(&custom_mqtt_user);
 392 |     wifiManager.addParameter(&custom_mqtt_pass);
 393 |     wifiManager.addParameter(&custom_temperature_scale);
 394 | #ifdef HOME_ASSISTANT_DISCOVERY
 395 |     wifiManager.addParameter(&custom_mqtt_ha_name);
 396 | #endif
 397 | #ifdef OTA_UPGRADES
 398 |     wifiManager.addParameter(&custom_ota_server);
 399 | #endif
 400 |     wifiManager.addParameter(&custom_text_machine_id);
 401 | 
 402 |     //reset settings - for testing
 403 |     //wifiManager.resetSettings();
 404 | 
 405 |     //set minimu quality of signal so it ignores AP's under that quality
 406 |     //defaults to 8%
 407 |     //wifiManager.setMinimumSignalQuality();
 408 | 
 409 |     //sets timeout until configuration portal gets turned off
 410 |     //useful to make it all retry or go to sleep
 411 |     //in seconds
 412 |     wifiManager.setTimeout(300);
 413 | 
 414 |     digitalWrite(pinAlarm, HIGH);
 415 |     drawDisplay("Gas Detector", "Connecting...", WiFi.SSID().c_str());
 416 | 
 417 |     //fetches ssid and pass and tries to connect
 418 |     //if it does not connect it starts an access point
 419 |     //and goes into a blocking loop awaiting configuration
 420 |     wifiManager.setAPCallback(apWiFiCallback);
 421 |     // Append the last 5 character of the machine id to the access point name
 422 |     String apId(machineId);
 423 |     apId = apId.substring(apId.length() - 5);
 424 |     String accessPointName = "ANAVI Gas Detector " + apId;
 425 |     if (!wifiManager.autoConnect(accessPointName.c_str(), ""))
 426 |     {
 427 |         digitalWrite(pinAlarm, LOW);
 428 |         Serial.println("failed to connect and hit timeout");
 429 |         delay(3000);
 430 |         //reset and try again, or maybe put it to deep sleep
 431 |         ESP.reset();
 432 |         delay(5000);
 433 |     }
 434 | 
 435 |     //if you get here you have connected to the WiFi
 436 |     Serial.println("connected...yeey :)");
 437 |     digitalWrite(pinAlarm, LOW);
 438 | 
 439 |     //read updated parameters
 440 |     strcpy(mqtt_server, custom_mqtt_server.getValue());
 441 |     strcpy(mqtt_port, custom_mqtt_port.getValue());
 442 |     strcpy(workgroup, custom_workgroup.getValue());
 443 |     strcpy(username, custom_mqtt_user.getValue());
 444 |     strcpy(password, custom_mqtt_pass.getValue());
 445 |     strcpy(temp_scale, custom_temperature_scale.getValue());
 446 | #ifdef HOME_ASSISTANT_DISCOVERY
 447 |     strcpy(ha_name, custom_mqtt_ha_name.getValue());
 448 | #endif
 449 | #ifdef OTA_UPGRADES
 450 |     strcpy(ota_server, custom_ota_server.getValue());
 451 | #endif
 452 | 
 453 |     //save the custom parameters to FS
 454 |     if (shouldSaveConfig)
 455 |     {
 456 |         saveConfig();
 457 |     }
 458 | 
 459 |     Serial.println("local ip");
 460 |     Serial.println(WiFi.localIP());
 461 |     drawDisplay("Connected!", "Local IP:", WiFi.localIP().toString().c_str());
 462 |     delay(2000);
 463 | 
 464 |     // Sensors
 465 |     htu.begin();
 466 |     bmp.begin();
 467 | 
 468 |     // MQTT
 469 |     Serial.print("MQTT Server: ");
 470 |     Serial.println(mqtt_server);
 471 |     Serial.print("MQTT Port: ");
 472 |     Serial.println(mqtt_port);
 473 |     // Print MQTT Username
 474 |     Serial.print("MQTT Username: ");
 475 |     Serial.println(username);
 476 |     // Hide password from the log and show * instead
 477 |     char hiddenpass[20] = "";
 478 |     for (size_t charP=0; charP < strlen(password); charP++)
 479 |     {
 480 |         hiddenpass[charP] = '*';
 481 |     }
 482 |     hiddenpass[strlen(password)] = '\0';
 483 |     Serial.print("MQTT Password: ");
 484 |     Serial.println(hiddenpass);
 485 |     Serial.print("Saved temperature scale: ");
 486 |     Serial.println(temp_scale);
 487 |     configTempCelsius = ( (0 == strlen(temp_scale)) || String(temp_scale).equalsIgnoreCase("celsius"));
 488 |     Serial.print("Temperature scale: ");
 489 |     if (true == configTempCelsius)
 490 |     {
 491 |       Serial.println("Celsius");
 492 |     }
 493 |     else
 494 |     {
 495 |       Serial.println("Fahrenheit");
 496 |     }
 497 | #ifdef HOME_ASSISTANT_DISCOVERY
 498 |     Serial.print("Home Assistant sensor name: ");
 499 |     Serial.println(ha_name);
 500 | #endif
 501 | #ifdef OTA_UPGRADES
 502 |     if (ota_server[0] != '\0')
 503 |     {
 504 |         Serial.print("OTA server: ");
 505 |         Serial.println(ota_server);
 506 |     }
 507 |     else
 508 |     {
 509 | #  ifndef OTA_SERVER
 510 |         Serial.println("No OTA server");
 511 | #  endif
 512 |     }
 513 | 
 514 | #  ifdef OTA_SERVER
 515 |     Serial.print("Hardcoded OTA server: ");
 516 |     Serial.println(OTA_SERVER);
 517 | #  endif
 518 | 
 519 | #endif
 520 | 
 521 |     const int mqttPort = atoi(mqtt_port);
 522 |     mqttClient.setServer(mqtt_server, mqttPort);
 523 |     mqttClient.setCallback(mqttCallback);
 524 | 
 525 |     mqttReconnect();
 526 | 
 527 |     Serial.println("");
 528 |     Serial.println("-----");
 529 |     Serial.print("Machine ID: ");
 530 |     Serial.println(machineId);
 531 |     Serial.println("-----");
 532 |     Serial.println("");
 533 | 
 534 |     setupADPS9960();
 535 | }
 536 | 
 537 | void setupADPS9960()
 538 | {
 539 |     if(apds.begin())
 540 |     {
 541 |         //gesture mode will be entered once proximity mode senses something close
 542 |         apds.enableProximity(true);
 543 |         apds.enableGesture(true);
 544 |     }
 545 | }
 546 | 
 547 | void waitForFactoryReset()
 548 | {
 549 |     Serial.println("Press button within 2 seconds for factory reset...");
 550 |     for (int iter = 0; iter < 20; iter++)
 551 |     {
 552 |         digitalWrite(pinAlarm, HIGH);
 553 |         delay(50);
 554 |         if (false == digitalRead(pinButton))
 555 |         {
 556 |             factoryReset();
 557 |             return;
 558 |         }
 559 |         digitalWrite(pinAlarm, LOW);
 560 |         delay(50);
 561 |         if (false == digitalRead(pinButton))
 562 |         {
 563 |             factoryReset();
 564 |             return;
 565 |         }
 566 |     }
 567 | }
 568 | 
 569 | void factoryReset()
 570 | {
 571 |     if (false == digitalRead(pinButton))
 572 |     {
 573 |         Serial.println("Hold the button to reset to factory defaults...");
 574 |         bool cancel = false;
 575 |         for (int iter=0; iter<30; iter++)
 576 |         {
 577 |             digitalWrite(pinAlarm, HIGH);
 578 |             delay(100);
 579 |             if (true == digitalRead(pinButton))
 580 |             {
 581 |                 cancel = true;
 582 |                 break;
 583 |             }
 584 |             digitalWrite(pinAlarm, LOW);
 585 |             delay(100);
 586 |             if (true == digitalRead(pinButton))
 587 |             {
 588 |                 cancel = true;
 589 |                 break;
 590 |             }
 591 |         }
 592 |         if (false == digitalRead(pinButton) && !cancel)
 593 |         {
 594 |             digitalWrite(pinAlarm, HIGH);
 595 |             Serial.println("Disconnecting...");
 596 |             WiFi.disconnect();
 597 | 
 598 |             // NOTE: the boot mode:(1,7) problem is known and only happens at the first restart after serial flashing.
 599 | 
 600 |             Serial.println("Restarting...");
 601 |             // Clean the file system with configurations
 602 |             SPIFFS.format();
 603 |             // Restart the board
 604 |             ESP.restart();
 605 |         }
 606 |         else
 607 |         {
 608 |             // Cancel reset to factory defaults
 609 |             Serial.println("Reset to factory defaults cancelled.");
 610 |             digitalWrite(pinAlarm, LOW);
 611 |         }
 612 |     }
 613 | }
 614 | 
 615 | #ifdef OTA_UPGRADES
 616 | void do_ota_upgrade(char *text)
 617 | {
 618 |     DynamicJsonDocument json(1024);
 619 |     auto error = deserializeJson(json, text);
 620 |     if (error)
 621 |     {
 622 |         Serial.println("No success decoding JSON.\n");
 623 |     }
 624 |     else if (!json.containsKey("server"))
 625 |     {
 626 |         Serial.println("JSON is missing server\n");
 627 |     }
 628 |     else if (!json.containsKey("file"))
 629 |     {
 630 |         Serial.println("JSON is missing file\n");
 631 |     }
 632 |     else
 633 |     {
 634 |         int port = 0;
 635 |         if (json.containsKey("port"))
 636 |         {
 637 |             port = json["port"];
 638 |             Serial.print("Port configured to ");
 639 |             Serial.println(port);
 640 |         }
 641 | 
 642 |         if (0 >= port || 65535 < port)
 643 |         {
 644 |             port = 80;
 645 |         }
 646 | 
 647 |         String server = json["server"];
 648 |         String file = json["file"];
 649 | 
 650 |         bool ok = false;
 651 |         if (ota_server[0] != '\0' && !strcmp(server.c_str(), ota_server))
 652 |             ok = true;
 653 | 
 654 | #  ifdef OTA_SERVER
 655 |         if (!strcmp(server.c_str(), OTA_SERVER))
 656 |             ok = true;
 657 | #  endif
 658 | 
 659 |         if (!ok)
 660 |         {
 661 |             Serial.println("Wrong OTA server. Refusing to upgrade.");
 662 |             return;
 663 |         }
 664 | 
 665 |         Serial.print("Attempting to upgrade from ");
 666 |         Serial.print(server);
 667 |         Serial.print(":");
 668 |         Serial.print(port);
 669 |         Serial.println(file);
 670 |         ESPhttpUpdate.setLedPin(pinAlarm, HIGH);
 671 |         WiFiClient update_client;
 672 |         t_httpUpdate_return ret = ESPhttpUpdate.update(update_client,
 673 |                                                        server, port, file);
 674 |         switch (ret)
 675 |         {
 676 |         case HTTP_UPDATE_FAILED:
 677 |             Serial.printf("HTTP_UPDATE_FAILD Error (%d): %s\n", ESPhttpUpdate.getLastError(), ESPhttpUpdate.getLastErrorString().c_str());
 678 |             break;
 679 | 
 680 |         case HTTP_UPDATE_NO_UPDATES:
 681 |             Serial.println("HTTP_UPDATE_NO_UPDATES");
 682 |             break;
 683 | 
 684 |         case HTTP_UPDATE_OK:
 685 |             Serial.println("HTTP_UPDATE_OK");
 686 |             break;
 687 |         }
 688 |     }
 689 | }
 690 | #endif
 691 | 
 692 | void processMessageScale(const char* text)
 693 | {
 694 |     StaticJsonDocument<200> data;
 695 |     deserializeJson(data, text);
 696 |     // Set temperature to Celsius or Fahrenheit and redraw screen
 697 |     Serial.print("Changing the temperature scale to: ");
 698 |     if (data.containsKey("scale") && (0 == strcmp(data["scale"], "celsius")) )
 699 |     {
 700 |         Serial.println("Celsius");
 701 |         configTempCelsius = true;
 702 |         strcpy(temp_scale, "celsius");
 703 |     }
 704 |     else
 705 |     {
 706 |         Serial.println("Fahrenheit");
 707 |         configTempCelsius = false;
 708 |         strcpy(temp_scale, "fahrenheit");
 709 |     }
 710 |     need_redraw = true;
 711 |     // Save configurations to file
 712 |     saveConfig();
 713 | }
 714 | 
 715 | void mqttCallback(char* topic, byte* payload, unsigned int length)
 716 | {
 717 |     // Convert received bytes to a string
 718 |     char text[length + 1];
 719 |     snprintf(text, length + 1, "%s", payload);
 720 | 
 721 |     Serial.print("Message arrived [");
 722 |     Serial.print(topic);
 723 |     Serial.print("] ");
 724 |     Serial.println(text);
 725 | 
 726 |     if (strcmp(topic, line1_topic) == 0)
 727 |     {
 728 |         snprintf(mqtt_line1, sizeof(mqtt_line1), "%s", text);
 729 |         need_redraw = true;
 730 |     }
 731 | 
 732 |     if (strcmp(topic, line2_topic) == 0)
 733 |     {
 734 |         snprintf(mqtt_line2, sizeof(mqtt_line2), "%s", text);
 735 |         need_redraw = true;
 736 |     }
 737 | 
 738 |     if (strcmp(topic, line3_topic) == 0)
 739 |     {
 740 |         snprintf(mqtt_line3, sizeof(mqtt_line3), "%s", text);
 741 |         need_redraw = true;
 742 |     }
 743 | 
 744 |     if (strcmp(topic, cmnd_temp_format) == 0)
 745 |     {
 746 |         processMessageScale(text);
 747 |     }
 748 | 
 749 | #ifdef OTA_UPGRADES
 750 |     if (strcmp(topic, cmnd_update_topic) == 0)
 751 |     {
 752 |         Serial.println("OTA request seen.\n");
 753 |         do_ota_upgrade(text);
 754 |         // Any OTA upgrade will stop the mqtt client, so if the
 755 |         // upgrade failed and we get here publishState() will fail.
 756 |         // Just return here, and we will reconnect from within the
 757 |         // loop().
 758 |         return;
 759 |     }
 760 | #endif
 761 | 
 762 |     publishState();
 763 | }
 764 | 
 765 | void calculateMachineId()
 766 | {
 767 |     MD5Builder md5;
 768 |     md5.begin();
 769 |     char chipId[25];
 770 |     sprintf(chipId,"%d",ESP.getChipId());
 771 |     md5.add(chipId);
 772 |     md5.calculate();
 773 |     md5.toString().toCharArray(machineId, sizeof(machineId));
 774 | }
 775 | 
 776 | void mqttReconnect()
 777 | {
 778 |     char clientId[18 + sizeof(machineId)];
 779 |     snprintf(clientId, sizeof(clientId), "anavi-gas-detector-%s", machineId);
 780 | 
 781 |     // Loop until we're reconnected
 782 |     for (int attempt = 0; attempt < 3; ++attempt)
 783 |     {
 784 |         Serial.print("Attempting MQTT connection...");
 785 |         // Attempt to connect
 786 |         if (true == mqttClient.connect(clientId, username, password))
 787 |         {
 788 |             Serial.println("connected");
 789 | 
 790 |             // Subscribe to MQTT topics
 791 |             mqttClient.subscribe(line1_topic);
 792 |             mqttClient.subscribe(line2_topic);
 793 |             mqttClient.subscribe(line3_topic);
 794 |             mqttClient.subscribe(cmnd_temp_coefficient_topic);
 795 |             mqttClient.subscribe(cmnd_temp_format);
 796 | #ifdef OTA_UPGRADES
 797 |             mqttClient.subscribe(cmnd_update_topic);
 798 | #endif
 799 |             publishState();
 800 |             break;
 801 | 
 802 |         }
 803 |         else
 804 |         {
 805 |             Serial.print("failed, rc=");
 806 |             Serial.print(mqttClient.state());
 807 |             Serial.println(" try again in 5 seconds");
 808 |             // Wait 5 seconds before retrying
 809 |             delay(5000);
 810 |         }
 811 |     }
 812 | }
 813 | 
 814 | #ifdef HOME_ASSISTANT_DISCOVERY
 815 | bool publishSensorDiscovery(const char *config_key,
 816 |                             const char *device_class,
 817 |                             const char *name_suffix,
 818 |                             const char *state_topic,
 819 |                             const char *unit,
 820 |                             const char *value_template,
 821 |                             bool binary = false)
 822 | {
 823 |     DynamicJsonDocument json(1024);
 824 | 
 825 |     String sensorType = "sensor";
 826 |     if (true == binary)
 827 |     {
 828 |         sensorType = "binary_sensor";
 829 |     }
 830 |     else
 831 |     {
 832 |         // Unit of measurement is supported only by non-binary sensors
 833 |         json["unit_of_measurement"] = unit;
 834 |         json["value_template"] = value_template;
 835 |     }
 836 |     static char topic[48 + sizeof(machineId)];
 837 |     snprintf(topic, sizeof(topic),
 838 |              "homeassistant/%s/%s/%s/config", sensorType.c_str(), machineId, config_key);
 839 | 
 840 |     if (0 < strlen(device_class))
 841 |     {
 842 |       json["device_class"] = device_class;
 843 |     }
 844 |     json["name"] = String(ha_name) + " " + name_suffix;
 845 |     json["unique_id"] = String("anavi-") + machineId + "-" + config_key;
 846 |     json["state_topic"] = String(workgroup) + "/" + machineId + "/" + state_topic;
 847 | 
 848 |     json["device"]["identifiers"] = machineId;
 849 |     json["device"]["manufacturer"] = "ANAVI Technology";
 850 |     json["device"]["model"] = "ANAVI Gas Detector";
 851 |     json["device"]["name"] = ha_name;
 852 |     json["device"]["sw_version"] = ESP.getSketchMD5();
 853 | 
 854 |     JsonArray connections = json["device"].createNestedArray("connections").createNestedArray();
 855 |     connections.add("mac");
 856 |     connections.add(WiFi.macAddress());
 857 | 
 858 |     Serial.print("Home Assistant discovery topic: ");
 859 |     Serial.println(topic);
 860 | 
 861 |     int payload_len = measureJson(json);
 862 |     if (!mqttClient.beginPublish(topic, payload_len, true))
 863 |     {
 864 |         Serial.println("beginPublish failed!\n");
 865 |         return false;
 866 |     }
 867 | 
 868 |     if (serializeJson(json, mqttClient) != payload_len)
 869 |     {
 870 |         Serial.println("writing payload: wrong size!\n");
 871 |         return false;
 872 |     }
 873 | 
 874 |     if (!mqttClient.endPublish())
 875 |     {
 876 |         Serial.println("endPublish failed!\n");
 877 |         return false;
 878 |     }
 879 | 
 880 |     return true;
 881 | }
 882 | #endif
 883 | 
 884 | void publishState()
 885 | {
 886 |     static char payload[300];
 887 |     static char topic[80];
 888 | 
 889 | #ifdef HOME_ASSISTANT_DISCOVERY
 890 | 
 891 |     String homeAssistantTempScale = (true == configTempCelsius) ? "°C" : "°F";
 892 | 
 893 |     publishSensorDiscovery("DangerousGas",
 894 |                            "gas",
 895 |                            "Dangerous Gas",
 896 |                            "DangerousGas",
 897 |                            "",
 898 |                            "",
 899 |                            true);
 900 | 
 901 |     publishSensorDiscovery("AirConductivity",
 902 |                            "",
 903 |                            "Air Conductivity",
 904 |                            "AirConductivity",
 905 |                            "%",
 906 |                            "{{ value_json.Conductivity | round(2) }}");
 907 | 
 908 | 
 909 |     if (isSensorAvailable(sensorHTU21D))
 910 |     {
 911 |         publishSensorDiscovery("temp",
 912 |                                "temperature",
 913 |                                "Temperature",
 914 |                                "temperature",
 915 |                                homeAssistantTempScale.c_str(),
 916 |                                "{{ value_json.temperature | round(1) }}");
 917 | 
 918 |         publishSensorDiscovery("humidity",
 919 |                                "humidity",
 920 |                                "Humidity",
 921 |                                "humidity",
 922 |                                "%",
 923 |                                "{{ value_json.humidity | round(0) }}");
 924 |     }
 925 | 
 926 |     if (isSensorAvailable(sensorBMP180))
 927 |     {
 928 |         publishSensorDiscovery("BMPtemperature",
 929 |                        "temperature",
 930 |                        "BMP Temperature",
 931 |                        "BMPtemperature",
 932 |                        homeAssistantTempScale.c_str(),
 933 |                        "{{ value_json.BMPtemperature | round(1) }}");
 934 | 
 935 |         publishSensorDiscovery("BMPpressure",
 936 |                "pressure",
 937 |                "Pressure",
 938 |                "BMPpressure",
 939 |                "hPa",
 940 |                "{{ value_json.BMPpressure | round(0) }}");
 941 | 
 942 |         publishSensorDiscovery("BMPaltitude",
 943 |                "",
 944 |                "Altitude",
 945 |                "BMPaltitude",
 946 |                "m",
 947 |                "{{ value_json.BMPaltitude | round(0) }}");
 948 |     }
 949 | 
 950 |     if (isSensorAvailable(sensorBH1750))
 951 |     {
 952 |         publishSensorDiscovery("light",
 953 |                        "illuminance",
 954 |                        "Light",
 955 |                        "light",
 956 |                        "Lux",
 957 |                        "{{ value_json.light }}");
 958 |     }
 959 | 
 960 | #endif
 961 | }
 962 | 
 963 | void publishSensorData(const char* subTopic, const char* key, const float value)
 964 | {
 965 |     StaticJsonDocument<100> json;
 966 |     json[key] = value;
 967 |     char payload[100];
 968 |     serializeJson(json, payload);
 969 |     char topic[200];
 970 |     sprintf(topic,"%s/%s/%s", workgroup, machineId, subTopic);
 971 |     mqttClient.publish(topic, payload, true);
 972 | }
 973 | 
 974 | void publishSensorData(const char* subTopic, const char* key, const String& value)
 975 | {
 976 |     StaticJsonDocument<100> json;
 977 |     json[key] = value;
 978 |     char payload[100];
 979 |     serializeJson(json, payload);
 980 |     char topic[200];
 981 |     sprintf(topic,"%s/%s/%s", workgroup, machineId, subTopic);
 982 |     mqttClient.publish(topic, payload, true);
 983 | }
 984 | 
 985 | void publishSensorDataPlain(const char* subTopic, const String& payload)
 986 | {
 987 |     char topic[200];
 988 |     sprintf(topic,"%s/%s/%s", workgroup, machineId, subTopic);
 989 |     mqttClient.publish(topic, payload.c_str(), true);
 990 | }
 991 | 
 992 | bool isSensorAvailable(int sensorAddress)
 993 | {
 994 |     // Check if I2C sensor is present
 995 |     Wire.beginTransmission(sensorAddress);
 996 |     return 0 == Wire.endTransmission();
 997 | }
 998 | 
 999 | void handleHTU21D()
1000 | {
1001 |     // Check if temperature has changed
1002 |     const float tempTemperature = htu.readTemperature();
1003 |     if (0.3 <= abs(tempTemperature - sensorTemperature))
1004 |     {
1005 |         // Print new temprature value
1006 |         sensorTemperature = tempTemperature;
1007 |         Serial.print("Temperature: ");
1008 |         Serial.println(formatTemperature(sensorTemperature));
1009 | 
1010 |         // Publish new temperature value through MQTT
1011 |         publishSensorData("temperature", "temperature", convertTemperature(sensorTemperature));
1012 | 
1013 |         // Temperature and humidity are shown on the display
1014 |         // so the text has to be refreshed
1015 |         need_redraw = true;
1016 |     }
1017 | 
1018 |     // Check if humidity has changed
1019 |     const float tempHumidity = htu.readHumidity();
1020 |     if (1 <= abs(tempHumidity - sensorHumidity))
1021 |     {
1022 |         // Print new humidity value
1023 |         sensorHumidity = tempHumidity;
1024 |         Serial.print("Humidity: ");
1025 |         Serial.print(sensorHumidity);
1026 |         Serial.println("%");
1027 | 
1028 |         // Publish new humidity value through MQTT
1029 |         publishSensorData("humidity", "humidity", sensorHumidity);
1030 | 
1031 |         // Temperature and humidity are shown on the display
1032 |         // so the text has to be refreshed
1033 |         need_redraw = true;
1034 |     }
1035 | }
1036 | 
1037 | void sensorWriteData(int i2cAddress, uint8_t data)
1038 | {
1039 |     Wire.beginTransmission(i2cAddress);
1040 |     Wire.write(data);
1041 |     Wire.endTransmission();
1042 | }
1043 | 
1044 | void handleBH1750()
1045 | {
1046 |     //Wire.begin();
1047 |     // Power on sensor
1048 |     sensorWriteData(sensorBH1750, 0x01);
1049 |     // Set mode continuously high resolution mode
1050 |     sensorWriteData(sensorBH1750, 0x10);
1051 | 
1052 |     uint16_t tempAmbientLight;
1053 | 
1054 |     Wire.requestFrom(sensorBH1750, 2);
1055 |     tempAmbientLight = Wire.read();
1056 |     tempAmbientLight <<= 8;
1057 |     tempAmbientLight |= Wire.read();
1058 |     // s. page 7 of datasheet for calculation
1059 |     tempAmbientLight = tempAmbientLight/1.2;
1060 | 
1061 |     if (1 <= abs(tempAmbientLight - sensorAmbientLight))
1062 |     {
1063 |         // Print new brightness value
1064 |         sensorAmbientLight = tempAmbientLight;
1065 |         Serial.print("Light: ");
1066 |         Serial.print(tempAmbientLight);
1067 |         Serial.println("Lux");
1068 | 
1069 |         // Publish new brightness value through MQTT
1070 |         publishSensorData("light", "light", sensorAmbientLight);
1071 |     }
1072 | }
1073 | 
1074 | void detectGesture()
1075 | {
1076 |     //read a gesture from the device
1077 |     const uint8_t gestureCode = apds.readGesture();
1078 |     // Skip if gesture has not been detected
1079 |     if (0 == gestureCode)
1080 |     {
1081 |         return;
1082 |     }
1083 |     String gesture = "";
1084 |     switch(gestureCode)
1085 |     {
1086 |     case APDS9960_DOWN:
1087 |         gesture = "down";
1088 |         break;
1089 |     case APDS9960_UP:
1090 |         gesture = "up";
1091 |         break;
1092 |     case APDS9960_LEFT:
1093 |         gesture = "left";
1094 |         break;
1095 |     case APDS9960_RIGHT:
1096 |         gesture = "right";
1097 |         break;
1098 |     }
1099 |     Serial.print("Gesture: ");
1100 |     Serial.println(gesture);
1101 |     // Publish the detected gesture through MQTT
1102 |     publishSensorData("gesture", "gesture", gesture);
1103 | }
1104 | 
1105 | void handleBMP()
1106 | {
1107 |   sensors_event_t event;
1108 |   bmp.getEvent(&event);
1109 |   if (!event.pressure)
1110 |   {
1111 |     // BMP180 sensor error
1112 |     return;
1113 |   }
1114 |   Serial.print("BMP180 Pressure: ");
1115 |   Serial.print(event.pressure);
1116 |   Serial.println(" hPa");
1117 |   float temperature;
1118 |   bmp.getTemperature(&temperature);
1119 |   Serial.print("BMP180 Temperature: ");
1120 |   Serial.println(formatTemperature(temperature));
1121 |   // For accurate results replace SENSORS_PRESSURE_SEALEVELHPA with the current SLP
1122 |   float seaLevelPressure = SENSORS_PRESSURE_SEALEVELHPA;
1123 |   float altitude;
1124 |   altitude = bmp.pressureToAltitude(seaLevelPressure, event.pressure, temperature);
1125 |   Serial.print("BMP180 Altitude: ");
1126 |   Serial.print(altitude);
1127 |   Serial.println(" m");
1128 | 
1129 |   // Do we need to draw again data on the mini OLED display?
1130 |   // Yes if HTU21D sensor is not attached and there is a significant temperature change
1131 |   if ( (false == isTempSensorAttached) && (0.3 <= abs(temperature - sensorBmpTemperature)) )
1132 |   {
1133 |     sensorBmpTemperature = temperature;
1134 |     need_redraw = true;
1135 |   }
1136 | 
1137 |   // Publish new pressure values through MQTT
1138 |   publishSensorData("BMPpressure", "BMPpressure", event.pressure);
1139 |   publishSensorData("BMPtemperature", "BMPtemperature", convertTemperature(temperature));
1140 |   publishSensorData("BMPaltitude", "BMPaltitude", altitude);
1141 | }
1142 | 
1143 | void handleSensors()
1144 | {
1145 |     isTempSensorAttached = false;
1146 |     isPressureSensorAttached = false;
1147 |     if (isSensorAvailable(sensorHTU21D))
1148 |     {
1149 |         isTempSensorAttached = true;
1150 |         handleHTU21D();
1151 |     }
1152 |     if (isSensorAvailable(sensorBH1750))
1153 |     {
1154 |         handleBH1750();
1155 |     }
1156 |     if (isSensorAvailable(sensorBMP180))
1157 |     {
1158 |       isPressureSensorAttached = true;
1159 |       handleBMP();
1160 |     }
1161 | }
1162 | 
1163 | void detectGas()
1164 | {
1165 |   int gas = analogRead(pinAdc);
1166 |   // Calculate conductivity in pecents
1167 |   // The gas concetration depends on the coductivity
1168 |   // If the analog MQ sensor detects more gases
1169 |   // the conductivity will be higher
1170 |   int conductivity = round(((float)gas/1023)*100);
1171 | 
1172 |   String quality = "Good";
1173 |   String gasState = "off";
1174 |   if (gas <= 190)
1175 |   {
1176 |     setColor(LOW, LOW, HIGH);
1177 |     gasState = "OFF";
1178 |   }
1179 |   else if (gas <= 300)
1180 |   {
1181 |     quality="Moderate";
1182 |     setColor(LOW, HIGH, LOW);
1183 |     gasState = "OFF";
1184 |   }
1185 |   else
1186 |   {
1187 |     quality="Poor";
1188 |     setColor(HIGH, LOW, LOW);
1189 |     gasState = "ON";
1190 |   }
1191 | 
1192 |   // Do not print or draw on the display if there is no
1193 |   // change of the state from the MQ gas sensor
1194 |   // or if the change of the value for ADC is minimal
1195 |   if ( (5 > abs(gas - prevGas)) || ((prevConductivity == conductivity) && (prevQuality == quality)) )
1196 |   {
1197 |     return;
1198 |   }
1199 | 
1200 |   // Update the detected gas values
1201 |   prevConductivity = conductivity;
1202 |   prevQuality = quality;
1203 |   prevGas = gas;
1204 | 
1205 |   sensor_line2 = "Quality: " + quality;
1206 |   sensor_line3 = "Conductivity: ";
1207 |   sensor_line3 += conductivity;
1208 |   sensor_line3 += "%";
1209 | 
1210 |   // Publish new pressure values through MQTT
1211 |   publishSensorData("AirQuality", "Quality", quality);
1212 |   publishSensorDataPlain("DangerousGas", gasState);
1213 |   publishSensorData("AirConductivity", "Conductivity", conductivity);
1214 | 
1215 |   // Print values in the serial output
1216 |   Serial.print("Gas value: ");
1217 |   Serial.println(gas);
1218 |   Serial.println(sensor_line1);
1219 |   Serial.println(sensor_line2);
1220 |   Serial.println(sensor_line3);
1221 | 
1222 |   need_redraw = true;
1223 | }
1224 | 
1225 | float convertCelsiusToFahrenheit(float temperature)
1226 | {
1227 |     return (temperature * 9/5 + 32);
1228 | }
1229 | 
1230 | float convertTemperature(float temperature)
1231 | {
1232 |     return (true == configTempCelsius) ? temperature : convertCelsiusToFahrenheit(temperature);
1233 | }
1234 | 
1235 | String formatTemperature(float temperature)
1236 | {
1237 |     String unit = (true == configTempCelsius) ? "°C" : "°F";
1238 |     return String(convertTemperature(temperature), 1) + unit;
1239 | }
1240 | 
1241 | void loop()
1242 | {
1243 |     // put your main code here, to run repeatedly:
1244 |     mqttClient.loop();
1245 | 
1246 |     // Reconnect if there is an issue with the MQTT connection
1247 |     const unsigned long mqttConnectionMillis = millis();
1248 |     if ( (false == mqttClient.connected()) && (mqttConnectionInterval <= (mqttConnectionMillis - mqttConnectionPreviousMillis)) )
1249 |     {
1250 |         mqttConnectionPreviousMillis = mqttConnectionMillis;
1251 |         mqttReconnect();
1252 |     }
1253 | 
1254 |     // Handle gestures at a shorter interval
1255 |     if (isSensorAvailable(APDS9960_ADDRESS))
1256 |     {
1257 |         detectGesture();
1258 |     }
1259 | 
1260 |     const unsigned long currentMillis = millis();
1261 |     // First check the I2C sensors and WiFi signal
1262 |     if (sensorInterval <= (currentMillis - sensorPreviousMillis))
1263 |     {
1264 |         sensorPreviousMillis = currentMillis;
1265 |         handleSensors();
1266 | 
1267 |         long rssiValue = WiFi.RSSI();
1268 |         String rssi = String(rssiValue) + " dBm";
1269 |         Serial.println(rssi);
1270 |         
1271 |         publishSensorData("wifi/ssid", "ssid", WiFi.SSID());
1272 |         publishSensorData("wifi/bssid", "bssid", WiFi.BSSIDstr());
1273 |         publishSensorData("wifi/rssi", "rssi", rssiValue);
1274 |         publishSensorData("wifi/ip", "ip", WiFi.localIP().toString());
1275 |         publishSensorData("sketch", "sketch", ESP.getSketchMD5());
1276 | 
1277 | #ifdef PUBLISH_CHIP_ID
1278 |         char chipid[9];
1279 |         snprintf(chipid, sizeof(chipid), "%08x", ESP.getChipId());
1280 |         publishSensorData("chipid", "chipid", chipid);
1281 | #endif
1282 |     }
1283 |     // Update the values from the analog MQ gas sensor
1284 |     if (gasInterval <= (currentMillis - sensorPreviousMillis))
1285 |     {
1286 |         gasPreviousMillis = currentMillis;
1287 |         detectGas();
1288 |     }
1289 | 
1290 |     if (true == need_redraw)
1291 |     {
1292 |         sensor_line1 = "Air ";
1293 |         if (true == isTempSensorAttached)
1294 |         {
1295 |           sensor_line1 += formatTemperature(sensorTemperature) + " ";
1296 |           sensor_line1 += (int)round(sensorHumidity);
1297 |           sensor_line1 += "%";
1298 |         }
1299 |         else if (true == isPressureSensorAttached)
1300 |         {
1301 |           // show only temperature if HTU21D sensor is not attached but
1302 |           // BMP180/280 sensor is attached
1303 |           sensor_line1 += formatTemperature(sensorBmpTemperature);
1304 |         }
1305 |         drawDisplay(mqtt_line1[0] ? mqtt_line1 : sensor_line1.c_str(),
1306 |                     mqtt_line2[0] ? mqtt_line2 : sensor_line2.c_str(),
1307 |                     mqtt_line3[0] ? mqtt_line3 : sensor_line3.c_str());
1308 |         need_redraw = false;
1309 |     }
1310 | 
1311 |     // Press and hold the button to reset to factory defaults
1312 |     factoryReset();
1313 | }
1314 | 


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