TechnicalEngineer
Published © GPL3+

Arduino Based Air Quality Monitoring IOT Project

In this tutorial, make an arduino based IOT project for air pollution monitoring using ThingSpeak platform.

IntermediateFull instructions provided18,677
Arduino Based Air Quality Monitoring IOT Project

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Schematics

Air Quality Montoring System using Arduino

Code

Code snippet #1

Plain text
//Program to 

#include <SoftwareSerial.h>

#include <LiquidCrystal.h>


LiquidCrystal lcd(13, 12, 6, 5, 4, 3);


float t=0;


char data = 0;


// replace with your channel's thingspeak API key

String apiKey = "8NBNB4VQ9F2EEWQM";


// connect 10 to TX of Serial USB

// connect 11 to RX of serial USB

SoftwareSerial ser(10,11); // RX, TX


// this runs once

void setup() 

{                

  // enable debug serial 

  //Serial.begin(9600);

  // enable software serial

  ser.begin(9600);

  lcd.begin(16, 2);


  lcd.setCursor(0,0); 

  lcd.print("Engineers Garage");

  lcd.setCursor(0,1);

  lcd.print("               "); 

  delay(3000);


  lcd.clear();

  lcd.setCursor(0,0);

  lcd.print("    IOT AIR");

  lcd.setCursor(0,1);

  lcd.print("QUALITY MONITOR");  

  delay(3000); 


 // pinMode(12, INPUT);

  

  // reset ESP8266 WiFi connection AT+CIPMUX=1 AT+CWJAP

  ser.println("AT");

  delay(1000);

  ser.println("AT+GMR");

  delay(1000);

  ser.println("AT+CWMODE=3");

  delay(1000);

  ser.println("AT+RST");

  delay(5000);

  ser.println("AT+CIPMUX=1");

  delay(1000);

  String cmd="AT+CWJAP=\"EngineersGarage\",\"egP@$$w0rd?\"";

  ser.println(cmd);

  delay(1000);

  ser.println("AT+CIFSR");

  delay(1000);


  lcd.clear();

  lcd.setCursor(0,0);

  lcd.print("      WIFI");

  lcd.setCursor(0,1);

  lcd.print("   CONNECTED");

 }



// the loop 

void loop()

{

  delay(1000);

  t = analogRead(A0);

  Serial.print("Airquality = ");

  Serial.println(t);


  lcd.clear();

  lcd.setCursor(0,0);

  lcd.print("  SENDING DATA");

  lcd.setCursor(0,1);

  lcd.print("    TO CLOUD");

  esp_8266();


}


void esp_8266()

{

   // TCP connection AT+CIPSTART=4,"TCP","184.106.153.149",80 

    String cmd = "AT+CIPSTART=4,\"TCP\",\"";

    cmd += "184.106.153.149"; // api.thingspeak.com

    cmd += "\",80";

    ser.println(cmd);

    Serial.println(cmd); 

    if(ser.find("Error"))

    {

      Serial.println("AT+CIPSTART error");

      return;

    }

  

  // prepare GET string GET https://api.thingspeak.com/update?api_key=LHAG4NSIYJ5UWS6U&field1=0\r\n\r\n

  String getStr = "GET /update?api_key=";

  getStr += apiKey;

  //getStr +="&field1=";

  //getStr +=String(h);

  getStr +="&field1=";

  getStr +=String(t);

  getStr += "\r\n\r\n";

  // send data length

  cmd = "AT+CIPSEND=4,";

  cmd += String(getStr.length());

  ser.println(cmd);

  Serial.println(cmd);

  delay(1000);

  ser.print(getStr);

  Serial.println(getStr);

     

  // thingspeak needs 15 sec delay between updates

  delay(16000);  

}

[/restrict]

Code for AIR Quality Monitoring System

C Header File
//Program to 

#include <SoftwareSerial.h>

#include <LiquidCrystal.h>


LiquidCrystal lcd(13, 12, 6, 5, 4, 3);


float t=0;


char data = 0;


// replace with your channel's thingspeak API key

String apiKey = "8NBNB4VQ9F2EEWQM";


// connect 10 to TX of Serial USB

// connect 11 to RX of serial USB

SoftwareSerial ser(10,11); // RX, TX


// this runs once

void setup() 

{                

  // enable debug serial 

  //Serial.begin(9600);

  // enable software serial

  ser.begin(9600);

  lcd.begin(16, 2);


  lcd.setCursor(0,0); 

  lcd.print("Engineers Garage");

  lcd.setCursor(0,1);

  lcd.print("               "); 

  delay(3000);


  lcd.clear();

  lcd.setCursor(0,0);

  lcd.print("    IOT AIR");

  lcd.setCursor(0,1);

  lcd.print("QUALITY MONITOR");  

  delay(3000); 


 // pinMode(12, INPUT);

  

  // reset ESP8266 WiFi connection AT+CIPMUX=1 AT+CWJAP

  ser.println("AT");

  delay(1000);

  ser.println("AT+GMR");

  delay(1000);

  ser.println("AT+CWMODE=3");

  delay(1000);

  ser.println("AT+RST");

  delay(5000);

  ser.println("AT+CIPMUX=1");

  delay(1000);

  String cmd="AT+CWJAP=\"EngineersGarage\",\"egP@$$w0rd?\"";

  ser.println(cmd);

  delay(1000);

  ser.println("AT+CIFSR");

  delay(1000);


  lcd.clear();

  lcd.setCursor(0,0);

  lcd.print("      WIFI");

  lcd.setCursor(0,1);

  lcd.print("   CONNECTED");

 }



// the loop 

void loop()

{

  delay(1000);

  t = analogRead(A0);

  Serial.print("Airquality = ");

  Serial.println(t);


  lcd.clear();

  lcd.setCursor(0,0);

  lcd.print("  SENDING DATA");

  lcd.setCursor(0,1);

  lcd.print("    TO CLOUD");

  esp_8266();


}


void esp_8266()

{

   // TCP connection AT+CIPSTART=4,"TCP","184.106.153.149",80 

    String cmd = "AT+CIPSTART=4,\"TCP\",\"";

    cmd += "184.106.153.149"; // api.thingspeak.com

    cmd += "\",80";

    ser.println(cmd);

    Serial.println(cmd); 

    if(ser.find("Error"))

    {

      Serial.println("AT+CIPSTART error");

      return;

    }

  

  // prepare GET string GET https://api.thingspeak.com/update?api_key=LHAG4NSIYJ5UWS6U&field1=0\r\n\r\n

  String getStr = "GET /update?api_key=";

  getStr += apiKey;

  //getStr +="&field1=";

  //getStr +=String(h);

  getStr +="&field1=";

  getStr +=String(t);

  getStr += "\r\n\r\n";

  // send data length

  cmd = "AT+CIPSEND=4,";

  cmd += String(getStr.length());

  ser.println(cmd);

  Serial.println(cmd);

  delay(1000);

  ser.print(getStr);

  Serial.println(getStr);

     

  // thingspeak needs 15 sec delay between updates

  delay(16000);  

}

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TechnicalEngineer

TechnicalEngineer

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