#define ledMerah 13
#define ledKuning 12
#define ledHijau 14

void setup() {
  // put your setup code here, to run once:
pinMode(ledMerah, OUTPUT);
pinMode(ledKuning, OUTPUT);
pinMode(ledHijau, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  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);
}