bool status = 0;

void setup() {
  pinMode(11, INPUT);
  pinMode(3, OUTPUT);

  Serial.begin(9600);
}

void loop() {
  int pullup = digitalRead(11);
  Serial.print("Value Biru: ");
  Serial.println(pullup);

  if(pullup == 0)
  {
    status = !status;
    digitalWrite(3, status);
    delay(500);
  }
}