DIY Mechanical Macro Numpad for $8

This video showcase my recent attempts to convert my previous macropad design that uses CH552G, into a full size numpad that features 17 (standard numpad) or 20 (macro-numpad) keys arrangement. The whole numpad can be built with just $8. The PCB itself cost the same as previous built, but the increase in cost are mostly came from the keycaps and switches.

The PCB and Arduino eco-system based firmware are open source on my Github. If you want to build one, you can take a look at the technical stuffs here:

[moustick]

Amazing project and your explication easy to follow. Keep the good work

[gregdee]

Fantastic! Dumb Q, where did u get the retro looking keys, slightly yellow or off white??? Thx for doing this!

[avri]

Looks very nice the only change I would make is replace the USB with a USB C port

[odd_origin]

I've been trying to upload the code using Arduino IDE, but I keep getting the error message "Found no CH55x USB" during the upload process. I am new to arduino, any tips?