int redLed = 13;    // LED Merah terhubung ke pin 13
int blueLed = 12;   // LED Biru terhubung ke pin 12
int greenLed = 11;  // LED Hijau terhubung ke pin 11
int buzzerPin = 9;  // Buzzer terhubung ke pin 9

void setup() {
  pinMode(redLed, OUTPUT);
  pinMode(blueLed, OUTPUT);
  pinMode(greenLed, OUTPUT);
  pinMode(buzzerPin, OUTPUT);
}

void loop() {
  // Menyalakan LED Merah
  digitalWrite(redLed, HIGH);
  digitalWrite(blueLed, LOW);
  digitalWrite(greenLed, LOW);
  delay(1000);

  // Menyalakan LED Biru
  digitalWrite(redLed, HIGH);
  digitalWrite(blueLed, HIGH);
  digitalWrite(greenLed, LOW);
  delay(1000);

  // Menyalakan LED Hijau
  digitalWrite(redLed, LOW);
  digitalWrite(blueLed, HIGH);
  digitalWrite(greenLed, HIGH);
  delay(1000);

  // Menyalakan LED Merah dan bunyi Buzzer
  digitalWrite(redLed, HIGH);
  digitalWrite(blueLed, LOW);
  digitalWrite(greenLed, HIGH);
  digitalWrite(buzzerPin, HIGH);
  tone(buzzerPin, 1000); // Memainkan nada dengan frekuensi 1000 Hz pada buzzer
  delay(1000);
  digitalWrite(buzzerPin, LOW);
  noTone(buzzerPin); // Menghentikan bunyi pada buzzer
}