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You’ll also need a way to power the Arduino while it’s in your vehicle since power can’t be taken from the OBD-II-UART board
The VBATT pin on the board is connected to the OBD-II VBATT, i.e. to the car battery. Is there any problem with taking power from there to my Arduino application? It’s not the OBD-II UART giving power, but the car itself…