I'm intending to save some .py files in the external storage on the usb pendrive, then read from it and process them on my esp8266, esp32, or uno R3. It does not have to be micropython, but rather a basic board that runs the C programming language. All I want is to connect an external storage device, such as a memory card or a pendrive. I would prefer to use micropython and a pendrive. ANyhting else transcending that would too work.