int button = 15 ; 
int nilai_tombol ;
int led = 5 ;
void setup (){
pinMode (button, INPUT );
pinMode (led, OUTPUT );
}

void loop () {
  nilai_tombol = digitalRead (button);
  if (nilai_tombol == HIGH ){
    digitalWrite (led, HIGH  );
}  else {
  digitalWrite (led, LOW );
  }
}