The Keeblab by edoelas is a controller-agnostic prototyping setup.
KBD.news Published June 19, 2021
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The idea behind this invention is to be able to make changes in software and wiring really easily, allowing to try different controllers, make a huge split or convert it to a midi piano to name a few options.
Right now it is using a black pill v3 as the controller.
…in my opinion the best controller if we consider the price: 5€. Plenty of IO and power, lots of options, small size and USB-C. Also provides access to the USB via pins.
This post by wolfwood proposes a modification to the improved square keyboard matrix in order to support a low power wake-on-keypress mode, which has been a deficiency of this design until now.