The core board of STC8H1K08 in TSSOP20 package is equipped with CH340G, 2 LEDs (cathode connected to P1.0 and P1.1 respectively), WS2812B (DI connected to P3.7). The power supply of the microcontroller is controlled by a MOSFET (on by default, turned off by pressing the button), which is used to cold-start the chip when downloading the program. The onboard 1117-5.0 LDO can be powered by a higher voltage power supply at the VIN pin.
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