// untuk menyimpan letak port arduino yang terhubung ke pin led ke variabel
const int merah = 2;
const int kuning = 3;

void setup() {
  // set mode pin led ke output
  pinMode(merah, OUTPUT);
  pinMode(kuning, OUTPUT);


}

void loop() {
  // lampu merah
  for(int brightness = 0; brightness <= 255; brightness++)
  {
    analogWrite(merah, brightness);
    delay(2);
  }
    for(int brightness = 255; brightness >= 0; brightness--)
  {
    analogWrite(merah, brightness);
    delay(2);
  }

  // lampu kuning
    for(int brightness = 0; brightness <= 255; brightness++)
  {
    analogWrite(kuning, brightness);
    delay(2);
  }
    for(int brightness = 255; brightness >= 0; brightness--)
  {
    analogWrite(kuning, brightness);
    delay(2);
  }

}