volatile unsigned long DebounceTimer;
volatile int ButtonPressed;
volatile unsigned int delayTime = 200;
#define pin 12
bool a1 = false;
void setup() {
  pinMode(pin, INPUT_PULLUP);
  Serial.begin(115200);
  
  attachInterrupt(digitalPinToInterrupt(pin), [] {if (ButtonPressed += (millis() - DebounceTimer) >= (delayTime )) DebounceTimer = millis();}, CHANGE);
  //attachInterrupt(digitalPinToInterrupt(pin), []{ButtonPressed++;}, RISING); // No Debounce
}
void loop() {
  if (ButtonPressed> 0) {ButtonPressed = 0;  a1 = digitalRead(pin);  // Must clear}
  if (a1 == true) {Serial.println(F("ЗАКРЫТО"));}
  else {Serial.println(F("ОТКРЫТО"));}
  }
  }