int gasPin = A0; // Pin sensor gas MQ-2
int ledPin = 8; // LED indikator
int gasValue; // Variabel penyimpan data gas
int batas = 300; // Ambang batas (bisa disesuaikan)
void setup() {
pinMode(ledPin, OUTPUT);
pinMode(gasPin, INPUT);
}
void loop() {
gasValue = analogRead(gasPin); // Membaca sensor gas
if (gasValue > batas) {
digitalWrite(ledPin, HIGH); // LED menyala → bahaya
} else {
digitalWrite(ledPin, LOW); // LED mati → aman
}
delay(300);
}