#define ledMerah 2
#define ledKuning 4
void setup() {
  // put your setup code here, to run once:
pinMode(ledMerah, OUTPUT);
pinMode(ledKuning, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(ledMerah, HIGH);
digitalWrite(ledKuning, LOW);
delay(300);
digitalWrite(ledMerah, LOW);
digitalWrite(ledKuning, HIGH);
delay(200);
}