#define pinMerah 8
#define pinKuning 9
#define pinHijau 10

void setup() {
  pinMode(pinMerah, OUTPUT);
  pinMode(pinKuning, OUTPUT);
  pinMode(pinHijau, OUTPUT);
}

void loop() {
  digitalWrite(pinMerah, HIGH);
  delay(300);
  digitalWrite(pinKuning, HIGH);
  delay(300);
  digitalWrite(pinHijau, HIGH);
  delay(300);
  digitalWrite(pinMerah, LOW);
  delay(300);
  digitalWrite(pinKuning, LOW);
  delay(300);
  digitalWrite(pinHijau, LOW);
  delay(300);
}