board/CHANGELOG.md

v3

mainly a manufacturing update. all parts are on one side.

the schematic remains fully compatible with v2.

changes:

• remove fuse as the designed has been proved, and the glues should prevent shorts
• put buttons on back side
• use button mounting holes as test points

v2

same USB type-A plug form factor. change MCU to STM32F042 since it provides read out protection, can recover 48 MHz clock from USB, and is easy to solder.

v1

smaller form factor. fits in USB type-A port. uses CH32V203 as it is smaller, cheaper, and requires less external parts (DP pull-up, crystal).

issues:

• USB pins are mirrored

v0

this is a large development board. it accepts the classical STM32F103 (which I'm more familiar with), and CH32V203 (cheaper). it has a proper debug port and buttons.

issues:

• USB pins are mirrored