Customisable MPCNC control pendant

My MPCNC control pendant with full credit to Slavulj for idea of using membrane keyboard and Arduino, and for the basis of the code, and to OT12345 for the design of the case.

It uses an Arduino Nano wired to RAMPS via Gnd, 5V and TX (TX from Nano to RX on RAMPS), lines as per INO to keypad, ditto via 220ohm resistors to LEDs for axis indication.

I redesigned the front panel to suit my LEDs (4mm flat top) but just drilled the mid section. I've now designed that in OpenSCAD too and ditto ba