const int ledMerah = 14;
const int ledKuning = 12;
const int ledHijau = 13;

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);
}