The project uses no less than 50 photo interrupters mounted on a custom PCB that mounts ... traditional scanning keyboard matrix and the whole thing is managed in the Arduino code (available ...

I chose the Arduino MEGA 2560 R3, but you can use any other, as long as it provides all the Input pins. Also, you need cables (of course), 2 times a 4x4 Matrix. I buyed myself little buttons on an pcb ...

the final PCB arrive and looks like: . Solder time, because I used SMD ... what pin you want to use for your keyboard, make sure you have enough pins for # of rows and # of columns. you can reference ...

[awende] over at Sparkfun has created a Cherry MX Keyboard which incorporates all of the Autodesk Eagle Shortcuts to a single 4×4 matrix. The project exploits the Arduino Pro Mini’s ability to ...

I opted for a Purple PCB color ... completed the process for each matrix.Moving to the host board, I soldered the surface mount devices, including female mezzanine connectors for board connectivity.