int tombol = 4;
int led = 8;
boolean hasilBaca;
void setup() {
  pinMode(tombol, INPUT);
  pinMode(led, OUTPUT);
}
void loop() {
  hasilBaca = digitalRead(tombol);
  if(hasilBaca == 1){
    digitalWrite(led, HIGH);
  }else{
    digitalWrite(led, LOW);
  }
}