int lampu1 = 11;
int lampu2 = 10;
int lampu3 = 9;

void setup() {
  pinMode(lampu1, OUTPUT);
  pinMode(lampu2, OUTPUT);
  pinMode(lampu3, OUTPUT);


}

void loop() {

  // matikan perlahan
  for (int fade=255; fade >= 0; fade-=5) {
    analogWrite(lampu1, fade);
    analogWrite(lampu2, fade);
    analogWrite(lampu3, fade);
    delay(30);
  }

  delay(30);

  // nyalakan perlahan
  for (int fade=0; fade <= 255; fade+=5) {
    analogWrite(lampu1, fade);
    analogWrite(lampu2, fade);
    analogWrite(lampu3, fade);
    delay(30);
  }

}