>

There are only 8 pins on the pro micro that are signal pins on both side, but that's not enough for one side (4x4=16, but there are 17 keys), so I had to use a 9th pin. This is RAW or GND on the other side of the controller. Because the PCB is flippable, I had to make a jumper for this 9th pin, which is the bottom row in this case, which is needed on the other side too.
Is it held together in the middle by the microcontroller or is there a stretch of PCB underneath? Very cool but that would make me nervous 😬 >

My secret goal was to trigger electromechanical engineers. >

based and pcbpilled >

where do you order them? also can you elaborate a tiny bit on how. I tried pcbway and uploading the file but it has a lot of options a noobie like me is not super familiar with, besides it gave me a $400 estimate for 5 pcbs >

Jlcpcb is the cheapest by a good margin. >

Love the idea to connect the halfs via the MC. Will give this a try at some point >

Add a TRRS footprint and a few more tweaks, and you can make it a cheap split as well. >

Oh boy, I love this. Don't tempt me! >

Cheapis gonna turn into expensivis when you keep snapping your microcontroller accidentally >

What is the “Wire to the other side” signal?