int melody[] = {
  262, 262, 294, 262, 349, 330, // Happy birthday to you
  262, 262, 294, 262, 392, 349, // Happy birthday to you
  262, 262, 523, 440, 349, 330, 294, // Happy birthday dear
  466, 466, 440, 349, 392, 349 // Happy birthday to you
};

int duration[] = {
  50, 50, 100, 100, 100, 200, // Happy birthday to you
  50, 50, 100, 100, 100, 200, // Happy birthday to you
  50, 50, 100, 100, 100, 100, 200, // Happy birthday dear
  50, 50, 100, 100, 100, 200 // Happy birthday to you
};

int buzzerPin = 8;  // Pin untuk buzzer
int ledm = 9;       // Pin untuk LED merah
int ledk = 10;      // Pin untuk LED kuning
int ledh = 11;      // Pin untuk LED hijau

void setup() {
  pinMode(buzzerPin, OUTPUT); 
  pinMode(ledm, OUTPUT);
  pinMode(ledk, OUTPUT);
  pinMode(ledh, OUTPUT);

  Serial.begin(9600); // Inisialisasi komunikasi serial
}

void loop() {
  // Mainkan melodi Happy Birthday
  for (int i = 0; i < 25; i++) {
    tone(buzzerPin, melody[i], duration[i]); // Mainkan nada
    delay(duration[i] + 100);               // Jeda antara nada
  }
  
  delay(1000); // Jeda setelah lagu selesai

  // Atur LED bergantian
  Serial.println("Merah menyala");
  digitalWrite(ledm, HIGH);
  digitalWrite(ledk, LOW);
  digitalWrite(ledh, LOW);
  delay(1000);

  Serial.println("Kuning menyala");
  digitalWrite(ledm, LOW);
  digitalWrite(ledk, HIGH);
  digitalWrite(ledh, LOW);
  delay(1000);

  Serial.println("Hijau menyala");
  digitalWrite(ledm, LOW);
  digitalWrite(ledk, LOW);
  digitalWrite(ledh, HIGH);
  delay(1000);
}