Engineering principle: Micro-USB supplies 5V voltage, which is stepped down to 3.3V by AMS1117-3.3V; the USB to TTL function is implemented through the CH340C chip, and finally the pin header is drawn out to supply the pin header to the microcontroller for circuit downloading.
Function: The USB to TTL function module realizes the download function of the microcontroller. From now on, there is no need to spend a lot of money to get a CH340C for the PCB board. Only this one can satisfy the download program of any microcontroller. Beautiful~
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