New library for Arduino support the DFR LCD Keypad shield - the keypad, to be precise. It features an encapsulated namespace, advanced debouncing (via histogram binning), fast ADC readout, key autorepeat (with configurable delay and repeat rate), key names and IDs.
The interface is quite simple, litte demo sketch attached.
Thanks to Volker Bartheld
Tested on DFRduino + LCD keypad Shield V1.1