Introduction - If you have any usage issues, please Google them yourself
The main control chip using STC8F series microcontroller.
Description:
STC university program experimental box 5.C principle diagram of SW19 is to download the power button, click the download and then release to cold start. Power supply: 5V power from USB, PCB cloth MCU power decoupling capacitors C1 and C2 to try to use short thick lines and even MCU