#define BUTTONPIN 7

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

void loop() {
  static bool pressedFlag = false;
  static unsigned long counter = 0;

  if (digitalRead(BUTTONPIN)== LOW){
    if (pressedFlag == false){
      counter++;
      Serial.println(counter);
      pressedFlag = true;
    }
  }
  else
    pressedFlag = false;
    
}