Very tiny breakout board for the STM233. Feel free to use the design in any way you would like. Design files are in KiCad 5. Gerbers are in the v1/ directory.
Personally, I would not recommend fabricating it as is. It is too small, making it a bit inconvenient to use.
Front:
Back:
Fabricated result, next to a Bluepill board for size comparison:
