This not cheap nor does it have a screen, but one of its many (many) uses allows interfacing USB to UART with auto-detection of both BAUD rate, voltage and whet

This not cheap nor does it have a screen, but one of its many (many) uses allows interfacing USB to UART with auto-detection of both BAUD rate, voltage and whether or not its inverted: https://www.crowdsupply.com/1bitsquared/glasgow https://www.crowdsupply.com/1bitsquared/glasgow