#define LedMerah 13
#define LedKuning 12
#define LedHijau 14

void setup() {
  pinMode(LedMerah, OUTPUT);
  pinMode(LedKuning, OUTPUT);
  pinMode(LedHijau, OUTPUT);
}

void loop() {
  digitalWrite(LedMerah, HIGH);
  delay(500);
  digitalWrite(LedMerah, LOW);
  digitalWrite(LedKuning, HIGH);
  delay(500);
  digitalWrite(LedKuning, LOW);
  digitalWrite(LedHijau, HIGH);
  delay(500);
  digitalWrite(LedHijau, LOW);
  digitalWrite(LedKuning, HIGH);
  delay(500);
  digitalWrite(LedKuning, LOW);
}