mq2

IT18203172/MQ-2_Gas_Sensor/MQ-2_Gas_Sensor.ino

+int gas =A2;
+int value = 0;
+
+void setup() {
+ pinMode(gas,INPUT);
+pinMode(13,OUTPUT);
+Serial.begin(9600);
+}
+
+void loop() {
+
+  value = analogRead(gas);
+  Serial.println(value);
+  delay(100);
+
+  if(value> 220){ //cahnge with your val
+  digitalWrite(13,HIGH);
+  Serial.print("LPG gas was detected");Serial.println(value);
+  delay(10);
+  }
+  else{
+  digitalWrite(13,LOW);
+  delay(10);
+  }
+
+}