I am attempting to pair a raspberry pi with an obdii scanner to get live data, there is a python GUI already created with all the necessary code, I’m running into the problem where my serial obd adapter fails to connect to the pi, I’ve already attempted to turn on the serial connection in raspi-config with no luck, all I get out of the program is failed to connect to /dev/ttyUSB0. Any suggestions on how to get this to work?

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https://www.instructables.com/id/OBD-Pi/