// Pin definitions
const int smokeSensorPin = A0; // MQ-2 analog output
const int greenLedPin = 11;
const int yellowLedPin = 12;
const int redLedPin = 13;
//const int buzzerPin = 10;


// Thresholds for smoke levels
const int lowThreshold = 300;   // Low smoke level
const int highThreshold = 450;  // High smoke level

void setup() {
  pinMode(greenLedPin, OUTPUT);
  pinMode(yellowLedPin, OUTPUT);
  pinMode(redLedPin, OUTPUT);
  //pinMode(buzzerPin, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  int smokeLevel = analogRead(smokeSensorPin); // Read smoke level
  Serial.println(smokeLevel); // Display smoke level in Serial Monitor

  // Clear all LEDs and buzzer initially
  digitalWrite(greenLedPin, LOW);
  digitalWrite(yellowLedPin, LOW);
  digitalWrite(redLedPin, LOW);
  //digitalWrite(buzzerPin, LOW);

  // Smoke detection logic
  if (smokeLevel < lowThreshold) {
    digitalWrite(greenLedPin, HIGH); // Safe zone
  } else if (smokeLevel >= lowThreshold && smokeLevel < highThreshold) {
    digitalWrite(yellowLedPin, HIGH); // Warning zone
  } else if (smokeLevel >= highThreshold) {
    digitalWrite(redLedPin, HIGH); // Danger zone
    //digitalWrite(buzzerPin, HIGH); // Activate buzzer
  }

  delay(1000); // Wait 1 second before reading again
}