mechware VS reviung

I do it for my keyboard firmware project, it's designed to compile up for Arduino (well, not their IDE, but VS with PlatformIO but it's much of a muchness) https://github.com/dairequinlan/mechware

code here https://github.com/dairequinlan/mechware/blob/main/src/input/MatrixInput.cpp That's dual use code, few #define chunks there for Ardiuno (Teensy) and Pico, but basically (using the more common Arduino syntax) ...

Plan is to add the BLE functionality as another pluggable module to my own firmware https://github.com/dairequinlan/mechware

Indeed. It makes for a neat µC for a keyboard, all that GPIO :-D OP are you planning a complete build ? This might be useful it's a complete pluggable and configurable firmware for PICO based keyboards. Dual compiles to Teensy/Arduino so there are a bunch of conditional blocks but it's fairly straightforward otherwise.

it's not an actual pro micro though, right ? It's a RP2040 board like the Pi Pico. I didn't know that that was even supported by QMK yet (if that's what you're trying to use). Coincidentally I just started using as a daily driver a custom split board I put together, which has a Pi PICO in either half, talking I2C to one another. Completely custom firmware though, source is here: https://github.com/dairequinlan/mechware/tree/pico

I felt like one of the Reviung boards would work, but they’ve either got too many columns or too few thumb keys…

And then do the wiring accordingly. From firmware perspective it is more like a reviung42 ;) see https://github.com/gtips/reviung/tree/master/reviung41

take a look at the bottom plate for the Reviung41 – includes some laser engraving to act as a diffuser for the LEDs (personal opinion, I think you could survive with only the two outer rows of RGB LEDs)

Reviung41

Reviung41, Reviung39, Reviung34, and Reviung5 – kits available at various shops around the net

This is a remix of the revlp from Cyril, which itself is remix of the reviung41 by GTips.

Reviung41, which has 5 thumb keys, one key naturally positioned for each thumb, one inner key for each, and a wide centre key for either thumb. These are set to: Function & Special Layer/Escape Command/Space Navigation Layer/Return (I originally had this centre key be space, which seemed natural, but the stretch was slightly annoying, so I switched it to Return (this had the added advantage of allowing me to use a regular 2¼U Return key!)) Number key — I’m still experimenting with this, but it is currently a Tap Dance: Tap — One Shot Home Row Number Layer Hold — Momentary Number Pad Layer Tap-Tap — Switch to Home Row Number Layer Tap-Hold — Switch to Number Pad Layer Right Option/One Shot Right Command — this is going to be replaced with a 5-way navigation switch and I’m not sure what the middle press will do (if anything)

How about a Reviung. The 41 is available from a few places, e.g.: https://www.littlekeyboards.com/products/reviung41-analyst-keyboard-kit