int buttonPin;
int lastButtonState;
int ledPin;
int currentButtonState;
int ledState;

void setup() {
  pinMode(buttonPin, INPUT);
  buttonPin = 12;
  ledPin = 2;
  ledState = LOW;
  lastButtonState = 0;
  currentButtonState = 0;
  pinMode(buttonPin, INPUT_PULLUP);
  Serial.begin(9600);
  currentButtonState = digitalRead(buttonPin);
}

void loop() {
  lastButtonState = currentButtonState;
  currentButtonState = digitalRead(buttonPin);
  if (lastButtonState == 1 && currentButtonState == 0) {
    Serial.println("PULSANTE PREMUTO");
    if (ledState == 0) {
      ledState = HIGH;
      Serial.println("ACCENSIONE LED");
    } else {
      ledState = LOW;
      Serial.println("SPEGNIMENTO LED");
    }
    digitalWrite(ledPin, ledState);
  }
}