JavanXD/esp32_bme680_access_point.ino

## esp32_bme680_access_point.ino
#include <WiFi.h>
#include <Wire.h>
#include <SPI.h>
#include <Adafruit_Sensor.h>
#include "Adafruit_BME680.h"

// Only needed for software SPI
//#define BME_SCK 13
//#define BME_MISO 12
//#define BME_MOSI 11
//#define BME_CS 10

#define SEALEVELPRESSURE_HPA (1013.25)

Adafruit_BME680 bme; // I2C
//Adafruit_BME680 bme(BME_CS); // Hardware SPI
//Adafruit_BME680 bme(BME_CS, BME_MOSI, BME_MISO,  BME_SCK); // Software SPI

// Set the humidity baseline to 40%, an optimal indoor humidity.
float humidityBaseline = 40.0;

// This sets the balance between humidity and gas reading in the calculation of airQualityScore (25:75, humidity:gas).
float humidityWeighting = 0.25;

int gasBaseline = 0;

boolean burnedIn = false;

// Replace with your network credentials.
const char* ssid     = "Sensoright";
const char* password = "123456789";

// Set web server port number to 80.
WiFiServer server(80);

// Variable to store the HTTP request.
String header;

void setup() {
  Serial.begin(115200);
  while (!Serial) {
    ; // Wait for serial port to connect. Needed for native USB port only.
  }

  Serial.println("Sensoright - BME680 ESP32");

  if (!bme.begin()) {
    Serial.println("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

  // Connect to Wi-Fi network with SSID and password.
  Serial.println("Setting AP (Access Point)…");
  // Remove the password parameter, if you want the AP (Access Point) to be open.
  WiFi.softAP(ssid, password);

  IPAddress IP = WiFi.softAPIP();
  Serial.print("Access point IP address: ");
  Serial.println(IP);

  server.begin();
}

void loop() {
  WiFiClient client = server.available();   // Listen for incoming clients

  if (client) {                             // If a new client connects,
    Serial.println("New Client.");          // print a message out in the serial port
    String currentLine = "";                // make a String to hold incoming data from the client
    while (client.connected()) {            // loop while the client's connected
      if (client.available()) {             // if there's bytes to read from the client,
        char c = client.read();             // read a byte, then
        Serial.write(c);                    // print it out the serial monitor
        header += c;
        if (c == '\n') {                    // if the byte is a newline character
          // if the current line is blank, you got two newline characters in a row.
          // that's the end of the client HTTP request, so send a response:
          if (currentLine.length() == 0) {
            // HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
            // and a content-type so the client knows what's coming, then a blank line:
            client.println("HTTP/1.1 200 OK");
            client.println("Content-type:text/html");
            client.println("Connection: close");
            client.println();

            // Display the HTML web page
            client.println("<!DOCTYPE html><html>");
            client.println("<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">");
            client.println("<meta charset=\"utf-8\">");
            client.println("<meta http-equiv=\"refresh\" content=\"30\"></head>");
            // Web page heading
            client.println("<body><h1>Sensoright</h1>");

            if (!bme.performReading()) {
              Serial.println("Auslesen des BME680-Sensors fehlgeschlagen!");

              client.println("<div><p>Auslesen des BME680-Sensors fehlgeschlagen!");
              client.println("</p></div>");
              client.println("</body></html>");
              // The HTTP response ends with another blank line
              client.println();

              // Break out of the while loop
              break;
            }

            if (!burnedIn) {
              client.println("<div><p>Der BME680-Sensor muss zuerst 2 Minuten eingebrannt werden, damit die Messwerte so genau wie möglich werden. Bitte warten…");
              client.println("</p></div>");
              client.println("</body></html>");
              // The HTTP response ends with another blank line
              client.println();

              // Burning-in BME680 sensor for calculating the air quality score (IAQ).
              Serial.println("Burning-in BME680 sensor and calculating gas baseline…");
              gasBaseline = calculateGasBaseline();

              // Break out of the while loop
              break;
            }

            float temperature = bme.temperature;
            Serial.print("Temperature = ");
            Serial.print(temperature);
            Serial.println(" °C");

            float humidity = bme.humidity;
            Serial.print("Humidity = ");
            Serial.print(humidity);
            Serial.println(" %");

            float pressure = bme.pressure / 100.0;
            Serial.print("Pressure = ");
            Serial.print(pressure);
            Serial.println(" hPa");

            float gas = bme.gas_resistance / 1000.0;
            Serial.print("Gas = ");
            Serial.print(gas);
            Serial.println(" KOhms");

            int iaq = getIaq();
            Serial.print("Air quality score = ");
            Serial.print(iaq);
            Serial.println(" IAQ");

            float altitude = bme.readAltitude(SEALEVELPRESSURE_HPA);
            Serial.print("Approx. altitude = ");
            Serial.print(altitude);
            Serial.println(" m");

            client.println("<div><p>Temperatur: ");
            client.println(temperature);
            client.println("&deg;C</p><p>Luftfeuchtigkeit: ");
            client.println(humidity);
            client.println("%</p><p>Luftdruck: ");
            client.println(pressure);
            client.println("hPa</p><p>Gaswiderstand: ");
            client.println(gas);
            client.println("KOhms</p><p>Luftqualität: ");
            client.println(iaq);
            client.println("IAQ</p><p>Meeresspiegel: ");
            client.println(altitude);
            client.println("m</p></div>");
            client.println("</body></html>");
            // The HTTP response ends with another blank line
            client.println();
            // Break out of the while loop
            break;
          } else { // if you got a newline, then clear currentLine
            currentLine = "";
          }
        } else if (c != '\r') {  // If you got anything else but a carriage return character,
          currentLine += c;      // add it to the end of the currentLine.
        }
      }
    }

    // Give the web browser time to receive the data.
    delay(1);

    // Clear the header variable.
    header = "";

    // Close the connection.
    client.stop();
    Serial.println("Client disconnected.");
    Serial.println("");
  }
}

int calculateGasBaseline() {
    // Collect gas resistance burn-in values for 2 minutes,
    // then use the average of the values to set the upper
    // limit for calculating gasBaseline.
    Serial.println("Collecting gas resistance burn-in data for 2 minutes");
    float burnInData[140];

    for (int i = 0; i < 140; i++) {
      Serial.print("Read ");
      Serial.print(i);
      Serial.println(" of 140…");

      Serial.print("Temperatur = ");
      Serial.println(bme.temperature);
      Serial.print("Luftfeuchtigkeit = ");
      Serial.println(bme.humidity);
      Serial.print("Luftdruck = ");
      Serial.println(bme.humidity);
      Serial.print("Meerespiegel = ");
      Serial.println(bme.readAltitude(SEALEVELPRESSURE_HPA));
      burnInData[i] = bme.gas_resistance;
      Serial.print("Gas = ");
      Serial.print(burnInData[i]);
      Serial.println(" Ohms");
      Serial.println();
      delay(500);
    }

    // Calculate the gas baseline (average of the gas data).
    float sum = 0;
    for (int i = 0; i < 140; i++) {
      sum = sum + burnInData[i];
    }

    float gasBaseline = sum / 140;
    Serial.print("Gas baseline = ");
    Serial.println(gasBaseline);

    burnedIn = true;

    return gasBaseline;
}

int getIaq() {
    float gas = bme.gas_resistance;
    Serial.print("Gas = ");
    Serial.println(gas);

    float gasOffset = gasBaseline - gas;
    Serial.print("Gas offset = ");
    Serial.println(gasOffset);

    float humidity = bme.humidity;
    Serial.print("Humidity = ");
    Serial.println(humidity);

    float humidityOffset = humidity - humidityBaseline;
    Serial.print("Humidity offset = ");
    Serial.println(humidityOffset);

    // Calculate humidityScore as the distance from the humidityBaseline.
    float humidityScore = 0.0;
    if (humidityOffset > 0) {
      humidityScore = (100 - humidityBaseline - humidityOffset);
      humidityScore /= (100 - humidityBaseline);
      humidityScore *= (humidityWeighting * 100);
    } else {
      humidityScore = (humidityBaseline + humidityOffset);
      humidityScore /= humidityBaseline;
      humidityScore *= (humidityWeighting * 100);
    }

    Serial.print("Humidity score = ");
    Serial.println(humidityScore);

    // Calculate gasScore as the distance from the gasBaseline.
    float gasScore = 0.0;
    if (gasOffset > 0) {
      gasScore = (gas / gasBaseline);
      gasScore *= (100 - (humidityWeighting * 100));
    } else {
      gasScore = 100 - (humidityWeighting * 100);
    }

    Serial.print("Gas score = ");
    Serial.println(gasScore);

    // Calcualte airQualityScore.
    return (int)(humidityScore + gasScore);
}
	#include <WiFi.h>
	#include <Wire.h>
	#include <SPI.h>
	#include <Adafruit_Sensor.h>
	#include "Adafruit_BME680.h"

	// Only needed for software SPI
	//#define BME_SCK 13
	//#define BME_MISO 12
	//#define BME_MOSI 11
	//#define BME_CS 10

	#define SEALEVELPRESSURE_HPA (1013.25)

	Adafruit_BME680 bme; // I2C
	//Adafruit_BME680 bme(BME_CS); // Hardware SPI
	//Adafruit_BME680 bme(BME_CS, BME_MOSI, BME_MISO, BME_SCK); // Software SPI

	// Set the humidity baseline to 40%, an optimal indoor humidity.
	float humidityBaseline = 40.0;

	// This sets the balance between humidity and gas reading in the calculation of airQualityScore (25:75, humidity:gas).
	float humidityWeighting = 0.25;

	int gasBaseline = 0;

	boolean burnedIn = false;

	// Replace with your network credentials.
	const char* ssid = "Sensoright";
	const char* password = "123456789";

	// Set web server port number to 80.
	WiFiServer server(80);

	// Variable to store the HTTP request.
	String header;

	void setup() {
	Serial.begin(115200);
	while (!Serial) {
	; // Wait for serial port to connect. Needed for native USB port only.
	}

	Serial.println("Sensoright - BME680 ESP32");

	if (!bme.begin()) {
	Serial.println("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

	// Connect to Wi-Fi network with SSID and password.
	Serial.println("Setting AP (Access Point)…");
	// Remove the password parameter, if you want the AP (Access Point) to be open.
	WiFi.softAP(ssid, password);

	IPAddress IP = WiFi.softAPIP();
	Serial.print("Access point IP address: ");
	Serial.println(IP);

	server.begin();
	}

	void loop() {
	WiFiClient client = server.available(); // Listen for incoming clients

	if (client) { // If a new client connects,
	Serial.println("New Client."); // print a message out in the serial port
	String currentLine = ""; // make a String to hold incoming data from the client
	while (client.connected()) { // loop while the client's connected
	if (client.available()) { // if there's bytes to read from the client,
	char c = client.read(); // read a byte, then
	Serial.write(c); // print it out the serial monitor
	header += c;
	if (c == '\n') { // if the byte is a newline character
	// if the current line is blank, you got two newline characters in a row.
	// that's the end of the client HTTP request, so send a response:
	if (currentLine.length() == 0) {
	// HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
	// and a content-type so the client knows what's coming, then a blank line:
	client.println("HTTP/1.1 200 OK");
	client.println("Content-type:text/html");
	client.println("Connection: close");
	client.println();

	// Display the HTML web page
	client.println("<!DOCTYPE html><html>");
	client.println("<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">");
	client.println("<meta charset=\"utf-8\">");
	client.println("<meta http-equiv=\"refresh\" content=\"30\"></head>");
	// Web page heading
	client.println("<body><h1>Sensoright</h1>");

	if (!bme.performReading()) {
	Serial.println("Auslesen des BME680-Sensors fehlgeschlagen!");

	client.println("<div><p>Auslesen des BME680-Sensors fehlgeschlagen!");
	client.println("</p></div>");
	client.println("</body></html>");
	// The HTTP response ends with another blank line
	client.println();

	// Break out of the while loop
	break;
	}

	if (!burnedIn) {
	client.println("<div><p>Der BME680-Sensor muss zuerst 2 Minuten eingebrannt werden, damit die Messwerte so genau wie möglich werden. Bitte warten…");
	client.println("</p></div>");
	client.println("</body></html>");
	// The HTTP response ends with another blank line
	client.println();

	// Burning-in BME680 sensor for calculating the air quality score (IAQ).
	Serial.println("Burning-in BME680 sensor and calculating gas baseline…");
	gasBaseline = calculateGasBaseline();

	// Break out of the while loop
	break;
	}

	float temperature = bme.temperature;
	Serial.print("Temperature = ");
	Serial.print(temperature);
	Serial.println(" °C");

	float humidity = bme.humidity;
	Serial.print("Humidity = ");
	Serial.print(humidity);
	Serial.println(" %");

	float pressure = bme.pressure / 100.0;
	Serial.print("Pressure = ");
	Serial.print(pressure);
	Serial.println(" hPa");

	float gas = bme.gas_resistance / 1000.0;
	Serial.print("Gas = ");
	Serial.print(gas);
	Serial.println(" KOhms");

	int iaq = getIaq();
	Serial.print("Air quality score = ");
	Serial.print(iaq);
	Serial.println(" IAQ");

	float altitude = bme.readAltitude(SEALEVELPRESSURE_HPA);
	Serial.print("Approx. altitude = ");
	Serial.print(altitude);
	Serial.println(" m");

	client.println("<div><p>Temperatur: ");
	client.println(temperature);
	client.println("°C</p><p>Luftfeuchtigkeit: ");
	client.println(humidity);
	client.println("%</p><p>Luftdruck: ");
	client.println(pressure);
	client.println("hPa</p><p>Gaswiderstand: ");
	client.println(gas);
	client.println("KOhms</p><p>Luftqualität: ");
	client.println(iaq);
	client.println("IAQ</p><p>Meeresspiegel: ");
	client.println(altitude);
	client.println("m</p></div>");
	client.println("</body></html>");
	// The HTTP response ends with another blank line
	client.println();
	// Break out of the while loop
	break;
	} else { // if you got a newline, then clear currentLine
	currentLine = "";
	}
	} else if (c != '\r') { // If you got anything else but a carriage return character,
	currentLine += c; // add it to the end of the currentLine.
	}
	}
	}

	// Give the web browser time to receive the data.
	delay(1);

	// Clear the header variable.
	header = "";

	// Close the connection.
	client.stop();
	Serial.println("Client disconnected.");
	Serial.println("");
	}
	}

	int calculateGasBaseline() {
	// Collect gas resistance burn-in values for 2 minutes,
	// then use the average of the values to set the upper
	// limit for calculating gasBaseline.
	Serial.println("Collecting gas resistance burn-in data for 2 minutes");
	float burnInData[140];

	for (int i = 0; i < 140; i++) {
	Serial.print("Read ");
	Serial.print(i);
	Serial.println(" of 140…");

	Serial.print("Temperatur = ");
	Serial.println(bme.temperature);
	Serial.print("Luftfeuchtigkeit = ");
	Serial.println(bme.humidity);
	Serial.print("Luftdruck = ");
	Serial.println(bme.humidity);
	Serial.print("Meerespiegel = ");
	Serial.println(bme.readAltitude(SEALEVELPRESSURE_HPA));
	burnInData[i] = bme.gas_resistance;
	Serial.print("Gas = ");
	Serial.print(burnInData[i]);
	Serial.println(" Ohms");
	Serial.println();
	delay(500);
	}

	// Calculate the gas baseline (average of the gas data).
	float sum = 0;
	for (int i = 0; i < 140; i++) {
	sum = sum + burnInData[i];
	}

	float gasBaseline = sum / 140;
	Serial.print("Gas baseline = ");
	Serial.println(gasBaseline);

	burnedIn = true;

	return gasBaseline;
	}

	int getIaq() {
	float gas = bme.gas_resistance;
	Serial.print("Gas = ");
	Serial.println(gas);

	float gasOffset = gasBaseline - gas;
	Serial.print("Gas offset = ");
	Serial.println(gasOffset);

	float humidity = bme.humidity;
	Serial.print("Humidity = ");
	Serial.println(humidity);

	float humidityOffset = humidity - humidityBaseline;
	Serial.print("Humidity offset = ");
	Serial.println(humidityOffset);

	// Calculate humidityScore as the distance from the humidityBaseline.
	float humidityScore = 0.0;
	if (humidityOffset > 0) {
	humidityScore = (100 - humidityBaseline - humidityOffset);
	humidityScore /= (100 - humidityBaseline);
	humidityScore = (humidityWeighting 100);
	} else {
	humidityScore = (humidityBaseline + humidityOffset);
	humidityScore /= humidityBaseline;
	humidityScore = (humidityWeighting 100);
	}

	Serial.print("Humidity score = ");
	Serial.println(humidityScore);

	// Calculate gasScore as the distance from the gasBaseline.
	float gasScore = 0.0;
	if (gasOffset > 0) {
	gasScore = (gas / gasBaseline);
	gasScore = (100 - (humidityWeighting 100));
	} else {
	gasScore = 100 - (humidityWeighting * 100);
	}

	Serial.print("Gas score = ");
	Serial.println(gasScore);

	// Calcualte airQualityScore.
	return (int)(humidityScore + gasScore);
	}