const int LedMerah = 13;
const int LedKuning = 12;
const int LedHijau = 11;


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);
digitalWrite(LedKuning, LOW);
digitalWrite(LedHijau, LOW);
delay(3000);
digitalWrite(LedMerah, LOW);
digitalWrite(LedKuning, HIGH);
digitalWrite(LedHijau, LOW);
delay(3000);
digitalWrite(LedMerah, LOW);
digitalWrite(LedKuning, LOW);
digitalWrite(LedHijau, HIGH);
delay(3000);


}