This project is a mess and it has never been tested.
The goal is to make STM32F103C BluePill compatible PCB with safety resistors, robust power supply with protections and SD card addon using a stacked PCB. The project is designed in KiCad with design rules for JLCPCB including SMT assembly with their LCSC parts library.
This PCB was never tested or manufactured because the STM32 microcontrollers are out of stock globally.