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.
this post was submitted on 30 May 2024
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Mechanical Keyboards
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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.
Like a standalone numpad?
Doesn’t have to be a standard numpad, I’m open to smaller designs where I can do additional macros.
I got nuthin so far. I have a numpad in my shopping cart waiting for an influx of money lol
Actually, I did just buy a 4 key with a knob off of Aliexpress. The switches and caps are shit, but I've got tons of options for those laying around, and it only cost like $4. I have to plug it into someone's PC to program it though. You can't program it on Mac.
Drop has a very nice 9 key macro pad called the Nin-doio. It's a macro pad that's made to closely mimic the GBA! It's pricey but it's really good build quality and very very cool.