// Definisikan pin LED
const int led1 = 2;
const int led2 = 3;
const int led3 = 4;

void setup() {
  // Set pin LED sebagai output
  pinMode(led1, OUTPUT);
  pinMode(led2, OUTPUT);
  pinMode(led3, OUTPUT);
}

void loop() {
  // Nyalakan LED 1
  digitalWrite(led1, HIGH);
  delay(500); // Tunggu selama 500ms
  digitalWrite(led1, LOW);

  // Nyalakan LED 2
  digitalWrite(led2, HIGH);
  delay(500); // Tunggu selama 500ms
  digitalWrite(led2, LOW);

  // Nyalakan LED 3
  digitalWrite(led3, HIGH);
  delay(500); // Tunggu selama 500ms
  digitalWrite(led3, LOW);
}