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Macro pad suggestions
(lemmy.world)
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Relatively easy to whip up yourself for little money if you have access to a 3D printer and a soldering iron. Get a RP2040 development board for $2, 9 switches and keycaps and hand solder them directly, you don't even need to source diodes.
I did exacltly that and made the 12-switch version of this for my daughter. As you note, a full size Pi Pico should have the 24 GPIO pins you need to avoid diodes.
For myself, I did a laser-cut numpad to use with the hand wired TKL-like I tend to use on my main PC. Then there are the others. I, uhh, may have a problem.