How to use gas sensor with arduino

Materials:-

• Arduino uno
• Gas sensor
• LED
• jumper wires

Connnections:-

        Gas sensor  VCC = Arduino 5V

        Gas sensor GND =Arduino GND

        Gas sensor    VO =Arduino Analog pin 3

        LED ( + )   = Arduino Digital pin 13

        LED ( - )    =Arduino GND

Code:-

//https://mrarduinoprojects.blogspot.com
int Led = 13;

int smoke = A3;

int sensorThres = 500;

void setup() {

  pinMode(Led, OUTPUT);

  pinMode(smoke, INPUT);

  Serial.begin(9600);

}

void loop() {

  int analogSensor = analogRead(smoke);

  Serial.print("Pin A0: ");

  Serial.println(analogSensor);

  if (analogSensor > sensorThres)

  {

    digitalWrite(Led, HIGH);

  }

  else

  {

    digitalWrite(Led, LOW);

  }

  delay(100);

}