const int  button_pin = 5;
 int button_value;



void setup() {
  pinMode(button_pin, INPUT_PULLUP);
   pinMode(LED_BUILTIN, OUTPUT);

   Serial.begin(9600);


}

void loop() {
  button_value = !digitalRead(button_pin);
  Serial.println(button_value);

  digitalWrite(LED_BUILTIN, button_value);
}