You can use CH551/CH552 and build the board at 0.8. There is no built-in resistor without considering the problem of multiple programming, so for the second programming, you need to use a resistor of about 10k to short-circuit the two exposed contacts before powering on.
It's hard to find when it's plugged into the USB. It sticks out a little so it can be pulled out. If you don't want to pull it out, you can make it smaller.
There is a big gap between the 3D preview and the finished product. Only after I got the board did I realize that there is still a lot of room for optimization.
BadUSB is a piece of hardware that assists computer users, such as:
1. Automatically press the button to shut down after 1 hour of power on.
2. Simulate a mouse click every 10 seconds
No other weird features
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