Vitalik BidochkaAndrew ShvaykaIlya Barkov
Published © Apache-2.0

PART 3 | ESP-WROOM-32 and BME280

In this tutorial, we will continue building our smart office and collect data from BME280 temperature, humidity and pressure sensor.

IntermediateProtip30 minutes1,156
PART 3 | ESP-WROOM-32 and BME280

Things used in this project

Hardware components

FireBeetle ESP32 IOT Microcontroller (Supports Wi-Fi & Bluetooth)
DFRobot FireBeetle ESP32 IOT Microcontroller (Supports Wi-Fi & Bluetooth)
×1
Breadboard (generic)
Breadboard (generic)
×1
Jumper wires (generic)
Jumper wires (generic)
×1
SparkFun Atmospheric Sensor Breakout - BME280
SparkFun Atmospheric Sensor Breakout - BME280
×1

Software apps and online services

Arduino IDE
Arduino IDE
Code from part one of this tutorial
ThingsBoard

Story

Read more

Schematics

Schema with BME-280

Code

Arduino Code

C/C++
#include <WiFi.h>
#include <MQUnifiedsensor.h>
#include <ThingsBoard.h>
#include <BME280I2C.h>
#include <Wire.h>             // Needed for legacy versions of Arduino.

#define SERIAL_BAUD 9600

const char* ssid = "YOUR_SSID";           
const char* password = "YOUR_PASSWORD";

#define TOKEN               "YOUR_DEVICE_TOKEN"
#define THINGSBOARD_SERVER  "thingsboard.cloud"

// Initialize ThingsBoard client
WiFiClient espClient;
// Initialize ThingsBoard instance
ThingsBoard tb(espClient);
// the Wifi radio's status
int status = WL_IDLE_STATUS;


//Definitions
#define placa "ESP-32"
#define Voltage_Resolution 3.3
#define pin 34 //Analog input 0 of your arduino
#define type "MQ-135" //MQ135
#define ADC_Bit_Resolution 12 // For arduino UNO/MEGA/NANO
#define RatioMQ135CleanAir 3.6//RS / R0 = 3.6 ppm  

double          CO2          =   (0);

MQUnifiedsensor MQ135(placa, Voltage_Resolution, ADC_Bit_Resolution, pin, type);

#define water_level_sensor_pin 35
int water_level_changed = 0;

#define light_sensor_pin 33

BME280I2C::Settings settings(
   BME280::OSR_X1,
   BME280::OSR_X1,
   BME280::OSR_X1,
   BME280::Mode_Forced,
   BME280::StandbyTime_1000ms,
   BME280::Filter_Off,
   BME280::SpiEnable_False,
   BME280I2C::I2CAddr_0x76 // I2C address. I2C specific.
);

BME280I2C bme(settings);

void setup()
{
  Serial.begin(9600);
  if(Serial) Serial.println("Serial is open");

  WiFi.begin(ssid, password);

  Serial.print("Connecting");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println();

  Serial.print("Connected, IP address: ");
  Serial.println(WiFi.localIP());

  //Set math model to calculate the PPM concentration and the value of constants
  MQ135.setRegressionMethod(1); //_PPM =  a*ratio^b
 
  MQ135.init(); 
  Serial.print("Calibrating please wait.");
  float calcR0 = 0;
  for(int i = 1; i<=10; i ++)
  {
    MQ135.update(); // Update data, the arduino will be read the voltage on the analog pin
    calcR0 += MQ135.calibrate(RatioMQ135CleanAir);
    Serial.print(".");
  }
  MQ135.setR0(calcR0/10);
  Serial.println("  done!.");
  
  if(isinf(calcR0)) {Serial.println("Warning: Conection issue founded, R0 is infite (Open circuit detected) please check your wiring and supply"); while(1);}
  if(calcR0 == 0){Serial.println("Warning: Conection issue founded, R0 is zero (Analog pin with short circuit to ground) please check your wiring and supply"); while(1);}
  /*****************************  MQ CAlibration ********************************************/ 
  MQ135.serialDebug(false);

  Wire.begin();
  while(!bme.begin())
  {
    Serial.println("Could not find BME280I2C sensor!");
    delay(1000);
  }

  switch(bme.chipModel())
  {
     case BME280::ChipModel_BME280:
       Serial.println("Found BME280 sensor! Success.");
       break;
     case BME280::ChipModel_BMP280:
       Serial.println("Found BMP280 sensor! No Humidity available.");
       break;
     default:
       Serial.println("Found UNKNOWN sensor! Error!");
  }

   // Change some settings before using.
   settings.tempOSR = BME280::OSR_X4;

   bme.setSettings(settings);

  pinMode(water_level_sensor_pin, INPUT);
  attachInterrupt(digitalPinToInterrupt(water_level_sensor_pin), water_level_alarm, CHANGE);
}

void water_level_alarm(void) {
    water_level_changed = true;
}

void loop()
{
  if (!tb.connected()) {
    // Connect to the ThingsBoard
    Serial.print("Connecting to: ");
    Serial.print(THINGSBOARD_SERVER);
    Serial.print(" with token ");
    Serial.println(TOKEN);
    if (!tb.connect(THINGSBOARD_SERVER, TOKEN)) {
      Serial.println("Failed to connect");
      return;
    }
  }

  if (water_level_changed) {
    tb.sendTelemetryInt("Water level", digitalRead(water_level_sensor_pin));
    water_level_changed = false;
  }

  MQ135.update(); // Update data, the arduino will be read the voltage on the analog pin
 
  MQ135.setA(110.47); MQ135.setB(-2.862);
  CO2 = MQ135.readSensor();

  MQ135.setA(605.18); MQ135.setB(-3.937);
  float CO = MQ135.readSensor();

  MQ135.setA(77.255); MQ135.setB(-3.18);
  float Alcohol = MQ135.readSensor();

  MQ135.setA(44.947); MQ135.setB(-3.445);
  float Toluene = MQ135.readSensor();

  MQ135.setA(102.2 ); MQ135.setB(-2.473);
  float NH4 = MQ135.readSensor();

  MQ135.setA(34.668); MQ135.setB(-3.369);
  float Acetone = MQ135.readSensor();

  float R_light = analogRead(light_sensor_pin);
  float lux = (250.0 / (0.0037 * R_light)) - 50.0;
  Serial.println(lux);

  float temp(NAN), hum(NAN), pres(NAN);
  
  BME280::TempUnit tempUnit(BME280::TempUnit_Celsius);
  BME280::PresUnit presUnit(BME280::PresUnit_Pa);
  
  bme.read(pres, temp, hum, tempUnit, presUnit);
  
  Serial.print("CO2: ");
  Serial.println(CO2);
  Serial.print("Light level: ");
  Serial.println(lux);
  Serial.println("Sending data...");

  tb.sendTelemetryFloat("CO2", CO2);  
  
  tb.sendTelemetryFloat("CO", CO);  
  
  tb.sendTelemetryFloat("Alcohol", Alcohol);  
  
  tb.sendTelemetryFloat("Toluene", Toluene);  
  
  tb.sendTelemetryFloat("NH4", NH4);  
  
  tb.sendTelemetryFloat("Acetone", Acetone);  
  
  
  tb.sendTelemetryFloat("Light level", lux);  
  
  tb.sendTelemetryFloat("Temperature", temp);  
  
  tb.sendTelemetryFloat("Humidity", hum);  
  
  tb.sendTelemetryFloat("Pressure", pres / 133.3224);  
  

  tb.loop();
  
  delay(1000); //Sampling frequency
}

Dashboard JSON File

JSON
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Credits

Vitalik Bidochka

Vitalik Bidochka

3 projects • 1 follower
Andrew Shvayka

Andrew Shvayka

5 projects • 18 followers
Ilya Barkov

Ilya Barkov

3 projects • 0 followers

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