#define PIN_DIN1 2

void setup() {
  Serial.begin(9600);
  pinMode(PIN_DIN1, INPUT_PULLUP);
}

void loop() {
  bool digIn1, digIn2, digIn3, digIn4, digIn5;
  static bool digIn1State, digIn2State, digIn3State, digIn4State, digIn5State;
  static bool digIn1Prev, digIn2Prev, digIn3Prev, digIn4Prev;
  static unsigned long digIn1Time, digIn2Time, digIn3Time, digIn4Time;

  digIn1 = !digitalRead(PIN_DIN1);
  if (digIn1 != digIn1Prev) {
    digIn1Time = millis();

  }
  if (millis() - digIn1Time > 100) {
    if (digIn1 != digIn1State) {
      digIn1State = digIn1;
      if (digIn1State == false)
      {
        Serial.println("Short" );
      }
    }
  }
  digIn1Prev = digIn1;
}