3 boards publicly available on BoardRepo.
A small CH340E based configurable RS485 or TTL 2/3-wire USB dongle
A narrow KiCad made PCB with STM8S001J3, RS485 driver and DS1621S Thermometer, e.g., for STM8EF-MODBUS
KiCad project: STM8L051F3P6 breakout w/ nRF24L01+
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