nrfmicro VS reviung

Either way, my advice is the same, first checkout this document which has known issues for a bunch of controller alternatives. Next, I'd recommend asking on the zmk discord since the zmk developers hang out there and are pretty active and helpful.

I'd give this a read. Should tell you everything you need to know.

Thank you! I have already connected the nrfmicro wireless controller to this board. It worked great!

Or this one https://github.com/joric/nrfmicro I made it to my board and works perfectly and it’s relatively easy to build even with just solder iron.

the nrf micro project is open source so you can review the schematic as a starting point https://github.com/joric/nrfmicro

If you can find nrf52 modules where you are then that's a good start, if you're not too scared of DIY intricate soldering then you can use them to build your own NRF micros. Ultimately the controller on these modules is the same as that of a nice!nano and if thus capable of running ZMK alone, there's not really a way as far as I know to pair them with a promicro or blackpill or similar to get a fully wireless solution.

What I know: https://github.com/joric/nrfmicro/wiki/Alternatives

slightly modified nRFMicro 1.4

Nothing I could say will be more thorough than this.

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