// Pin definitions
const int redPin = 8;
const int greenPin = 9;
const int bluePin = 10;
const int buzzerPin = 12;

// Define the frequency of each note for "Happy Birthday" song
const int happyBirthdayNotes[] = {262, 262, 294, 262, 349, 330, 262, 262, 294, 262, 392, 349, 262, 262, 523, 440, 349, 330, 294, 466, 466, 440, 349, 392, 349};

// Define the durations of each note (in milliseconds)
const int noteDurations[] = {400, 400, 800, 800, 800, 1600, 400, 400, 800, 800, 800, 1600, 400, 400, 400, 400, 800, 400, 400, 800, 400, 400, 400, 800, 800};

void setup() {
  // Set RGB LED pins as outputs
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);
  
  // Set buzzer pin as output
  pinMode(buzzerPin, OUTPUT);
}

void loop() {
  // Play "Happy Birthday" song and control the RGB LED
  for (int i = 0; i < sizeof(happyBirthdayNotes) / sizeof(happyBirthdayNotes[0]); i++) {
    // Control RGB LED
    if (i % 3 == 0) {
      analogWrite(redPin, 255);
      digitalWrite(greenPin, LOW);
      digitalWrite(bluePin, LOW);
    } else if (i % 3 == 1) {
      digitalWrite(redPin, LOW);
      analogWrite(greenPin, 255);
      digitalWrite(bluePin, LOW);
    } else {
      digitalWrite(redPin, LOW);
      digitalWrite(greenPin, LOW);
      analogWrite(bluePin, 255);
    }
    
    // Play note
    tone(buzzerPin, happyBirthdayNotes[i], noteDurations[i]);
    delay(noteDurations[i] * 1); // Pause between notes
    noTone(buzzerPin);
    
    // Turn off all LEDs
    digitalWrite(redPin, LOW);
    digitalWrite(greenPin, LOW);
    digitalWrite(bluePin, HIGH);
    
    delay(100); // Delay between notes
  }
}