int gasSensor = A0;
int led = 13;
int threshold = 300;

void setup() {
  pinMode(gasSensor, INPUT);
  pinMode(led, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  int gasValue = analogRead(gasSensor);
  Serial.print("Gas Level: ");
  Serial.println(gasValue);
  
  if (gasValue > threshold) {
    digitalWrite(led, HIGH);
    Serial.println("Gas detected!");
  } else {
    digitalWrite(led, LOW);
  }
  
  delay(1000);
}