Smoke Detector Using Mq2 Sensor

Just Do Electronics August 03, 2020

Video :-

Circuit Diagram :-

Code :-

 
//Prateek
//www.prateeks.in

#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
 

const int buzzerPin = 5;
int redled = 4;
int greenled = 6; 

#define gasPin A0


void setup() {
  
     lcd.init();
  lcd.backlight();
  lcd.clear();
  
 Serial.begin(9600);
 lcd.begin(16, 2); 
 
  pinMode(buzzerPin, OUTPUT);
  pinMode(redled, OUTPUT);
  pinMode(greenled, OUTPUT);

 lcd.setCursor(0, 0);
  lcd.print("Calibrating");
    for(int i = 0; i <10; i++){
      if (i==4)
      {
         lcd.setCursor(0, 1);
         lcd.print(".");
        }
       else  lcd.print(".");
      delay(500);
      }
    lcd.setCursor(5, 1);
    lcd.print("done");
    delay(1000);
    lcd.clear(); 
    lcd.setCursor(1, 0);
    lcd.print("SENSOR ACTIVE");
    delay(1500);
    lcd.clear();

}

void loop() {
  
int gasSensor = analogRead(gasPin);

  if (gasSensor > 250)
  {
       digitalWrite(buzzerPin, HIGH);
      digitalWrite(redled, HIGH);

     digitalWrite(greenled, LOW);
     lcd.setCursor(0, 0);
     lcd.print("Value : ");
     lcd.print(gasSensor);
     Serial.print(gasSensor);
     Serial.print("\t");
     lcd.setCursor(0, 1);
     Serial.println("Gas is Detected");   
     lcd.print("Gas is Detected");  
     delay(300); 
     lcd.clear();
  }
  else if (gasSensor < 350)
  {
     
    digitalWrite(buzzerPin, LOW);
    digitalWrite(greenled, HIGH);
    digitalWrite(redled, LOW);
    
     lcd.setCursor(0, 0);
     lcd.print("Value : ");
     lcd.print(gasSensor);
     Serial.print(gasSensor);
     Serial.print("\t");
     lcd.setCursor(0, 1);
     Serial.println("No Gas"); 
     lcd.print("No Gas");   
     delay(300);
  }
  
}

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