Most of the time when playing with microcontrollers, ordinary virtual serial port modules are used, and drivers need to be installed. This is a USB-HID to serial port module, which is driver-free or comes with the system driver. It is still very useful in some cases.
The chip was purchased from the mall C109026 .
I referred to zhqsoft’s board , thank you! The circuit layout was changed and a Micro USB socket was used to further reduce the size to about 20mm*14mm.
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