// set pin numbers;
const int buttonPin = 2;       //PB pada pin 2
const int ledPin =  13;        //led pada pin 13
const int led12 = 12;         //led pada pin 12
const int led11 = 11;        //led pada pin 11
const int led10 = 10;       //led pada pin 10
const int led9 = 9;         //led pada pin 9

//variable will change;
int buttonstate = 0      //variable untuk status PB 

void setup(){
  // inisialisasi LED pada output arduino UNO:
  pinMode(ledPin, OUTPUT);
  pinMode(led12, OUTPUT);
  pinMode(led11, OUTPUT);
  pinMode(led10, OUTPUT);
  pinMode(led9, OUTPUT);

  // initialize the pushbutton as an input:
  pinMode(buttonpin, INPUT);
}

void loop(){
  // read the state of the pushbutton value:
  buttonState = digitalRead(buttonpin);

  // check if the pushbutton is pressed
  // if it is, the buttonState is HIGH
  if (buttonState == HIGH) {}
}