int smokeCO2Pin = 7; // Digital pin where the sensor is connected
int relayPin = 3;   // Digital pin connected to the relay module
int buzzerPin = 9;  // Digital pin connected to the buzzer

void setup() {
  pinMode(smokeCO2Pin, INPUT);
  pinMode(relayPin, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
}

void loop() {
  int smokeCO2Value = digitalRead(smokeCO2Pin);

  if (smokeCO2Value == HIGH) {
    // Smoke or high CO2 detected
    digitalWrite(relayPin, HIGH); // Activate relay to trigger external device
    digitalWrite(buzzerPin, HIGH); // Activate buzzer for alert
    delay(1000); // Delay for 1 second
    digitalWrite(buzzerPin, LOW); // Turn off buzzer
    delay(1000); // Delay for 1 second
  } else {
    // No smoke or normal CO2 levels
    digitalWrite(relayPin, LOW); // Deactivate relay
    digitalWrite(buzzerPin, LOW); // Turn off buzzer
  }

  delay(1000); // Read sensor every 1 second (adjust as needed)
}