#define BUTTON_PIN 4

void setup() {
  Serial.begin(115200);
  pinMode(BUTTON_PIN, INPUT_PULLUP);
  
}

int counter=0;
int lastState=HIGH;

void loop() {
  int value=digitalRead((BUTTON_PIN));
  if(lastState!=value){
    counter++;
    lastState=value;
    Serial.println(counter);
  }


}