//Button pin 3
  const int BUTTON_PIN = 3;

  int zaehler = 0;
  int lastButtonState = HIGH;



void setup() {
  // put your setup code here, to run once:
  pinMode(BUTTON_PIN,INPUT_PULLUP);
  Serial.begin(115200);

}

void loop() {
  int buttonState = digitalRead(BUTTON_PIN);


  if (buttonState == LOW && lastButtonState == HIGH) {
    zaehler = zaehler +1;
    Serial.println(zaehler);
  } 
  lastButtonState = buttonState;

  delay(10);
}