//с delay
int buttonPin = 2;
bool prevState = false;
bool lampOn = false;

void setup() {
  pinMode(buttonPin, INPUT);
  pinMode(13, OUTPUT);
  Serial.begin(9600);
}

void loop() {
  bool buttonState = digitalRead(buttonPin);
  if (buttonState != prevState) {
    prevState = buttonState;
    if (buttonState) {
      Serial.println("Кнопка нажата");
      lampOn = !lampOn; // 
      if (lampOn) {
        digitalWrite(13, HIGH);
        delay(500); 
        digitalWrite(13, LOW);
        delay(500);
      } else {
        digitalWrite(13, LOW);
      }
    } else {
      Serial.println("Кнопка не нажата");
    }
  }
}