Powered by SY8089AAAC, it is used to replace the MCU core board defined by the base interface. The other MCU versions of the same base core board include WROOM32D, C3-32S, and 328P versions.
It can be used as the base plate for my other OLED clock.
The iron wire jumper is used to enable the BUCK chip. The initial version had a design error and the PCB has been corrected.
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