// Pin Definitions
const int POT_PIN = A1;
const int GREEN_LED = 2;
const int YELLOW_LED = 3;
const int RED_LED = 4;
const int BUZZER = 5;

// Thresholds
const int WARNING_LEVEL = 400;  // Transition to Yellow
const int CRITICAL_LEVEL = 800; // Transition to Red/Buzzer

void setup() {
  pinMode(GREEN_LED, OUTPUT);
  pinMode(YELLOW_LED, OUTPUT);
  pinMode(RED_LED, OUTPUT);
  pinMode(BUZZER, OUTPUT);
  
  Serial.begin(9600);
}

void loop() {
  int sensorValue = analogRead(POT_PIN);
  Serial.print("Sensor Level: ");
  Serial.println(sensorValue);

  // Level 1: SAFE (Green Only)
  if (sensorValue < WARNING_LEVEL) {
    digitalWrite(GREEN_LED, HIGH);
    digitalWrite(YELLOW_LED, LOW);
    digitalWrite(RED_LED, LOW);
    noTone(BUZZER); // Ensure buzzer is off
  } 
  // Level 2: WARNING (Yellow Only)
  else if (sensorValue >= WARNING_LEVEL && sensorValue < CRITICAL_LEVEL) {
    digitalWrite(GREEN_LED, LOW);
    digitalWrite(YELLOW_LED, HIGH);
    digitalWrite(RED_LED, LOW);
    noTone(BUZZER);
  } 
  // Level 3: CRITICAL (Red + Pulsing Buzzer)
  else {
    digitalWrite(GREEN_LED, LOW);
    digitalWrite(YELLOW_LED, LOW);
    digitalWrite(RED_LED, HIGH);
    
    // Create a pulsing "siren" effect
    tone(BUZZER, 1000); // 1kHz tone
    delay(100);
    noTone(BUZZER);
    delay(100);
  }

  delay(50); // Fast response for smooth dial movement
}