// Pin definitions
const int gasSensorPin = 16;  // Analog pin connected to gas sensor
const int buzzerPin = 21;     // Digital pin connected to buzzer

// Threshold for alert (adjust based on sensor calibration)
const int gasThreshold = 3000;  

void setup() {
  Serial.begin(115200);        // Start serial monitor
  pinMode(buzzerPin, OUTPUT);  // Set buzzer pin as output
}

void loop() {
  int gasValue = analogRead(gasSensorPin);  // Read gas sensor analog value
  Serial.print("Gas Sensor Value: ");
  Serial.println(gasValue);

  if (gasValue > gasThreshold) {
  tone(buzzerPin, 1000);  // 1 kHz sound
} else {
  noTone(buzzerPin);       // stop sound
}


  delay(500); // Read every 0.5 second
}