// --- Konfigurasi Waktu ---
unsigned long intervalLED1 = 500;   // LED 1 kedip setiap 0.5 detik
unsigned long intervalLED2 = 1000;  // LED 2 kedip setiap 1 detik
unsigned long intervalLED3 = 1500;  // LED 3 kedip setiap 1.5 detik

// --- Variabel Penyimpan Waktu Terakhir ---
unsigned long prevMillisLED1 = 0;
unsigned long prevMillisLED2 = 0;
unsigned long prevMillisLED3 = 0;

// --- Status LED ---
bool ledState1 = LOW;
bool ledState2 = LOW;
bool ledState3 = LOW;

void setup() {
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);

  digitalWrite(2, ledState1);
  digitalWrite(3, ledState2);
  digitalWrite(4, ledState3);
}

void loop() {
  unsigned long currentMillis = millis();  // baca waktu sekarang

  // --- LED 1 ---
  if (currentMillis - prevMillisLED1 >= intervalLED1) {
    ledState1 = !ledState1;                 // ubah status
    digitalWrite(2, ledState1);             // tulis ke pin 2
    prevMillisLED1 = currentMillis;         // update waktu terakhir
  }

  // --- LED 2 ---
  if (currentMillis - prevMillisLED2 >= intervalLED2) {
    ledState2 = !ledState2;
    digitalWrite(3, ledState2);
    prevMillisLED2 = currentMillis;
  }

  // --- LED 3 ---
  if (currentMillis - prevMillisLED3 >= intervalLED3) {
    ledState3 = !ledState3;
    digitalWrite(4, ledState3);
    prevMillisLED3 = currentMillis;
  }
}