First of all, I would like to thank @1174247739lc . The inspiration for this project came from him. He also gave me the first Demo board. He is really a very, very good person.
Then there are two versions of this project, which are based on CH340k and CH340C. Personally, I recommend using the CH340K version. After testing the spring pins, I recommend buying P100-E2. Here is the Taobao purchase link. 
The screw copper pillar is recommended as:
screw m2*2
copper pillar. m2*4，m2*2+3
Then for the package reserved on your own PCB, please refer to the "PCB Recommended Package" for the only component on this schematic diagram.
PS: TX and RX on the writer and PCB are reversed, don’t draw them wrongly
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