[Arm-netbook] Building your own keyboard

[Christopher Havel]

Quick note... the Pro Micro is a new revision of the older Arduino Micro
and has fewer IO pins, IIRC. It may not have enough pins for these
purposes...

OF COURSE Chinese eBay factories/sellers jumped on the new one. You can
still buy the older ones if you fiddle with keywords well enough (or sort
through fifteen million pages of crap) but be prepared to pay a wee bit
more than you used to be able to get away with... ~$10 instead of about
half that IIRC.