const int led[]={2,3,4,5,6,7,8,9,10,11,12,13}; //nomor pin board
const int pbutton = A5;
const int elektroda[]={1,5,9,12}; //indeks dimulai dari 1 bukan nol
int lightOn = 0;
int pushed = 0;

void setup() {
  Serial.begin(9600);
  // definisi mode tiap pin:
  for(int i=0; i<12; i++){
    pinMode(led[i], OUTPUT);
    // Serial.println(led[i]);
  }
  pinMode(pbutton, INPUT_PULLUP); 

}

void loop() {
  // put your main code here, to run repeatedly:
  int val = digitalRead(pbutton);

  if(val == 1 && lightOn == 0){
    pushed = 1-pushed;
    delay(100);
  }
  lightOn = val;
  // Serial.println(pushed);

  if(pushed == 1){
    for(int i=0; i<12; i++){
        digitalWrite(led[i], LOW);
        Serial.println("Light OFF");
    }
  }else{
    for (int i=0; i<4; i++){
    digitalWrite(led[elektroda[i]-1], HIGH);
    Serial.println("Light ON");
    }
  }
}