Hardened GNU/Linux posts the story of designing an inexpensive microcontroller board and the iterations done with contract fabs in getting the board designed for manufacturability.

We’ll share what’ve been through the general problem in the hacking journey. We select the stm32 based system because it’s easy to implement the interfaces of IO, USB and a serial port programming circuit which is compatible with stm32-vserprog (SPI flash memory programmer).

We use Kicad as design tool and takes a several versions to achieve the current version. As each revision has been released with this document, hope it can be helpful to you in a way or another.

This is an interesting document if you’re looking to go from concept to design to prototype to iterating for mest manufacturability.

See the entire process on GitHub here.