USB-OTG-CH340-UART-interface that is a library communication with USB convert uart, that module is ch340 model, it not need root of your phone.
The cheapest USB to serial chip on the market appears to be the CH340G, available for 20-40 cents apiece from the usual retailers. There is, however, almost no English documentation, and the ...
I bought a "LCUS-4 4 Channel USB Relay Module Smart Switch" to control some power supply's for my DIY kits. Python is probably the easiest way to control this device - using "tera term" or another ...
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