class KeyChecker{
  public:
    KeyChecker(unsigned char keyM,unsigned char keyNl,unsigned char hz);
    void checkKeys();
    unsigned char getEnter();
    unsigned char getExit();
    void delay(unsigned int d); // eingenes Delay, da delay.h Fehler ergibt
  private:
    unsigned char keyEnter, keyExit;
    unsigned char keyMask,keyNlogik,keyOld,mhz;
};