// Deklarasi pin untuk 6 LED
int led1 = 7;
int led2 = 8;
int led3 = 9;
int led4 = 10;
int led5 = 11;
int led6 = 12;

// Variabel untuk menyimpan status urutan
int direction = 1; // 1 untuk maju, -1 untuk mundur
int currentLed = 1; //melacak LED mana yang sedang menyala

void setup() {
  // Inisialisasi pin sebagai output
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
  pinMode(led4, OUTPUT);
  pinMode(led5, OUTPUT);
  pinMode(led6, OUTPUT);
}

void loop() {
  // Matikan semua LED
  digitalWrite(led1, LOW);
  digitalWrite(led2, LOW);
  digitalWrite(led3, LOW);
  digitalWrite(led4, LOW);
  digitalWrite(led5, LOW);
  digitalWrite(led6, LOW);

  // Nyalakan LED sesuai dengan currentLed
  if (currentLed == 1) {
    digitalWrite(led1, HIGH);
  } else if (currentLed == 2) {
    digitalWrite(led2, HIGH);
  } else if (currentLed == 3) {
    digitalWrite(led3, HIGH);
  } else if (currentLed == 4) {
    digitalWrite(led4, HIGH);
  } else if (currentLed == 5) {
    digitalWrite(led5, HIGH);
  } else if (currentLed == 6) {
    digitalWrite(led6, HIGH);
  }

  delay(500); // Delay selama 300 ms

  // Ubah arah jika sampai di LED pertama atau terakhir
  if (currentLed == 6) {
    direction = -1; // Balik arah ke mundur
  } else if (currentLed == 1) {
    direction = 1; // Balik arah ke maju
  }

  // Ubah currentLed sesuai arah
  currentLed += direction;
}