Pins Connection

Components Required

Arduino UNO -> A microcontroller board based on the ATmega328P MQ2 Gas Sensor -> Which detects the level of smoke Buzzer -> A device that produces sound or alarm 5V LED -> A Light-emitting diode that emits light  100ohm Resistor -> To resist the current Jumper Wires -> For connecting the elements of the circuit...

Circuit Diagram

circuit diagram...

Pins Connection

Arduino Digital pin 0 is connected with the (+ve) pin of Buzzer Arduino Digital pin 1  is connected with the (+ve) pin of LED1(green) Arduino Digital pin 2  is connected with the (+ve) pin of LED2(red) Arduino Analog pin A0  is connected with A0 Pin of MQ2 Gas sensor Arduino 5v Power pin is connected with VCC pin of Gas sensor Arduino GND Power pin is connected with GND pin of Gas sensor Arduino GND Power pin is connected with (-ve) pins of LED’s with resistance Arduino GND Power pin is connected with GND pins of a Buzzer with resistance...

Arduino Code

//stored pins in variables#define gasSensor A0#define buzzer 0#define ledGreen 1#define ledRed 2#define HIGH 600void setup() { //Initialising all pins pinMode(gasSensor, INPUT); pinMode(buzzer, OUTPUT); pinMode(ledGreen, OUTPUT); pinMode(ledRed, OUTPUT); }void loop() { //Read data from the sensorint gas_value = analogRead(gasSensor);//check data from sensor if there is smoke, if will execute otherwise else will executeif(gas_value > HIGH){ tone(buzzer,1000,500); digitalWrite(ledRed, HIGH); digitalWrite(ledGreen,LOW); }else{ noTone(buzzer); digitalWrite(ledGreen,HIGH); digitalWrite(ledRed, LOW);}delay(200); }...