W hile macro pads are nothing new, they are becoming increasingly popular. A lot of this is down to gamers and streamers ...

the Num Lock key. This switches JAnK over to 21-key macro pad mode. [Clewsy] rolled their own PCB for this and used the venerable ATMega32u4 because of its HID and USB host capabilities.

Hardware-wise, the Mathboard is a 4×4 macro pad, but the special sauce is in the key set implementation firmware. While the most straightforward approach would be to pick 16 or 32 symbols for the ...