const int lampu1=2;
const int lampu2=3;
const int lampu3=4;
const int jmllampu=3;
const int pinlampu[]={2,3,4};

void setup() {
  // put your setup code here, to run once:
pinMode(lampu1, OUTPUT);
pinMode(lampu2, OUTPUT);
pinMode(lampu3, OUTPUT);
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
  Menyala();
  delay(2000);
  Mati();
  delay(2000);
  Ganti();
  delay(500);
}

void Menyala(){
  digitalWrite(lampu1, HIGH);
  digitalWrite(lampu2, HIGH);
  digitalWrite(lampu3, HIGH);
  Serial.println("Lampu Menyala");
}

void Mati(){
  digitalWrite(lampu1,LOW);
  digitalWrite(lampu2, LOW);
  digitalWrite(lampu3, LOW);
  Serial.println("Lampu Mati");
}

void Ganti(){
  for(int i=0;i<jmllampu;i++){
    digitalWrite(pinlampu[i],HIGH); 
    delay(1000);
    digitalWrite(pinlampu[i],LOW);
  }
  Serial.println("Lampu Bergantian Menyala");
}