const int buttonPin = 2;             
int counter = 0;                      

bool stableButtonState = HIGH;       
bool lastReading = HIGH;              
unsigned long lastDebounceTime = 0;   
const unsigned long debounceDelay = 50; 

void setup() {
  pinMode(buttonPin, INPUT_PULLUP);  
  Serial.begin(9600);                 
}

void loop() {
  bool reading = digitalRead(buttonPin); 

  if (reading != lastReading) {
    lastDebounceTime = millis();
    lastReading = reading;
  }

  if ((millis() - lastDebounceTime) > debounceDelay) {
    if (reading != stableButtonState) {
      stableButtonState = reading;

      if (stableButtonState == LOW) {
        counter++;
        Serial.print("Liczba klikniec: ");
        Serial.println(counter);
      }
    }
  }

}