void checkInputStates() {
  for (byte i = 0; i < sizeof(pulseInPins); i++) {
    byte _inputCurrentState = digitalRead(pulseInPins[i]);
    if (_inputCurrentState == LOW && pulseInLastState[i] == HIGH) {
      pulseInLastDebounceTime[i] = millis();
      pulseAlreadyDetected[i] = false;
      pulseInLastState[i] = _inputCurrentState;
    }
    else if (_inputCurrentState == LOW && pulseInLastState[i] == LOW) {
      if ( (millis() - pulseInLastDebounceTime[i]) > debounceDelay && !pulseAlreadyDetected[i]) {
        //if ( (millis() - pulseInLastDebounceTime[i]) > debounceDelay ) {
        pulseInLastDebounceTime[i] = millis();
        pulseAlreadyDetected[i] = true;
        increaseCounter(i);
      }
    }
    else if (_inputCurrentState == HIGH && pulseInLastState[i] == LOW) {
      if ( (millis() - pulseInLastDebounceTime[i]) > debounceRecoveryDelay ) {
        pulseInLastState[i] = _inputCurrentState;
      }
    }
  }
}