BME680 Weather Station

/********* Rui Santos Complete project details at https://RandomNerdTutorials.com/esp32-bme680-sensor-arduino/ Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files. The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. updated by Riccardo Grosso 03/18/25, hppts://www.ethicaldiy.org *********/ #include #include #include #include "Adafruit_BME680.h" #include #include "ESPAsyncWebServer.h" // Replace with your network credentials const char* ssid = "your SSID Wi-Fi lan"; const char* password = "your password"; //Uncomment if using SPI /*#define BME_SCK 18 #define BME_MISO 19 #define BME_MOSI 23 #define BME_CS 5*/ Adafruit_BME680 bme; // I2C //Adafruit_BME680 bme(BME_CS); // hardware SPI //Adafruit_BME680 bme(BME_CS, BME_MOSI, BME_MISO, BME_SCK); #define SEALEVELPRESSURE_HPA (1025.25) //base: 1013,25 slm float temperature; float humidity; float pressure; float gasResistance; float altitude; float temperaturef; AsyncWebServer server(80); AsyncEventSource events("/events"); unsigned long lastTime = 0; unsigned long timerDelay = 30000; // send readings timer void getBME680Readings() { // Tell BME680 to begin measurement. unsigned long endTime = bme.beginReading(); if (endTime == 0) { Serial.println(F("Failed to begin reading :(")); return; } if (!bme.endReading()) { Serial.println(F("Failed to complete reading :(")); return; } temperature = bme.temperature; temperaturef = (1.8 * (bme.temperature) + 32); pressure = bme.pressure / 100.0; humidity = bme.humidity; gasResistance = bme.gas_resistance / 1000.0; altitude = bme.readAltitude(SEALEVELPRESSURE_HPA); } String processor(const String& var) { getBME680Readings(); //Serial.println(var); if (var == "TEMPERATURE") { return String(temperature); } else if (var == "TEMPERATUREF") { return String(1.8 * (bme.temperature) + 32); } else if (var == "HUMIDITY") { return String(humidity); } else if (var == "PRESSURE") { return String(pressure); } else if (var == "GAS") { return String(gasResistance); } else if (var == "ALTITUDE") { return String(altitude); } } const char index_html[] PROGMEM = R"rawliteral( BME680 Weather Station

BME680 Weather Station

TEMPERATURE

%TEMPERATURE% °C

TEMPERATURE

%TEMPERATUREF% °F

HUMIDITY

%HUMIDITY% %

PRESSURE

%PRESSURE% hPa

GAS

%GAS% KΩ

ALTITUDE

%ALTITUDE% slm

)rawliteral"; void setup() { Serial.begin(115200); Wire.begin(27, 22); // Set the device as a Station and Soft Access Point simultaneously WiFi.mode(WIFI_AP_STA); // Set device as a Wi-Fi Station WiFi.begin(ssid, password); while (WiFi.status() != WL_CONNECTED) { delay(1000); Serial.println("Setting as a Wi-Fi Station.."); } Serial.print("Station IP Address: "); Serial.println(WiFi.localIP()); Serial.println(); // Init BME680 sensor if (!bme.begin()) { Serial.println(F("Could not find a valid BME680 sensor, check wiring!")); while (1); } // Set up oversampling and filter initialization bme.setTemperatureOversampling(BME680_OS_8X); bme.setHumidityOversampling(BME680_OS_2X); bme.setPressureOversampling(BME680_OS_4X); bme.setIIRFilterSize(BME680_FILTER_SIZE_3); bme.setGasHeater(320, 150); // 320*C for 150 ms // Handle Web Server server.on("/", HTTP_GET, [](AsyncWebServerRequest * request) { request->send_P(200, "text/html", index_html, processor); }); // Handle Web Server Events events.onConnect([](AsyncEventSourceClient * client) { if (client->lastId()) { Serial.printf("Client reconnected! Last message ID that it got is: %u\n", client->lastId()); } // send event with message "hello!", id current millis // and set reconnect delay to 1 second client->send("hello!", NULL, millis(), 10000); }); server.addHandler(&events); server.begin(); } void loop() { if ((millis() - lastTime) > timerDelay) { getBME680Readings(); Serial.printf("Temperature = %.2f ºC \n", temperature); Serial.printf("TemperatureF = %.2f ºF \n", temperaturef); Serial.printf("Humidity = %.2f % \n", humidity); Serial.printf("Pressure = %.2f hPa \n", pressure); Serial.printf("Gas Resistance = %.2f KOhm \n", gasResistance); Serial.printf("Altitude approx = %.2f slm \n", altitude); Serial.println(); // Send Events to the Web Server with the Sensor Readings events.send("ping", NULL, millis()); events.send(String(temperature).c_str(), "temperature", millis()); events.send(String(temperaturef).c_str(), "temperaturef", millis()); events.send(String(humidity).c_str(), "humidity", millis()); events.send(String(pressure).c_str(), "pressure", millis()); events.send(String(gasResistance).c_str(), "gas", millis()); events.send(String(altitude).c_str(), "altitude", millis()); lastTime = millis(); } }