// Inisialisasi pin LED
const int ledRed = 11;
const int ledYellow = 8;
const int ledGreen = 2;
const int ledBlue = 6;

void setup() {
  // Set semua pin LED sebagai output
  pinMode(ledRed, OUTPUT);
  pinMode(ledYellow, OUTPUT);
  pinMode(ledGreen, OUTPUT);
  pinMode(ledBlue, OUTPUT);
}

void loop() {
  digitalWrite(ledRed, HIGH);
  delay(500);
  digitalWrite(ledRed, LOW);
  delay(1000);

  digitalWrite(ledYellow, HIGH);
  delay(500);
  digitalWrite(ledYellow, LOW);
  delay(1000);

  digitalWrite(ledGreen, HIGH);
  delay(500);
  digitalWrite(ledGreen, LOW);
  delay(1000);

  digitalWrite(ledBlue, HIGH);
  delay(500);
  digitalWrite(ledBlue, LOW);
  delay(1000);
}