#define BTN_PIN 4
bool pState = false;
int count=0;
void setup() {
Serial.begin(9600);
pinMode(BTN_PIN, INPUT);
}

void loop() 
{
  bool state=digitalRead(BTN_PIN);
  if (pState!=state)
  {
  pState=state;
    if (state==true)
    {
    count++;
    Serial.print("Кнопка нажата: ");
    Serial.println(count);
    }
  }
  delay(50);
}