I have a couple projects that I’m mulling over that will need a microcontroller. I have a Nucleo board with an M3 on it but I think for some smaller projects that the M0 will work fine. Instead of getting another Nucleo board I figured it would be worth creating my own minimal dev board for the practice and because I would eventually need to figure out how to get it all working together later anyway.
Once I figured out what parts I would need and started playing around with the layout I thought it might be possible to fit everything onto a 1x1" square and then it became a self-challenge.
I was thrilled when I finally got OSH Park to tell me:
0.93x0.98 inches (23.52x24.79mm). $4.50 for three.
… so satisfying.
The only confusing part was how the measurement didn’t quite line up between KiCad and OSH Park, not sure if maybe it is accounting for kerf or if it’s that the board outline line is greater than 0? Either way, exceeded my goal, can’t complain with that!