Hi. I'm using a SparkFun OBD-II UART with an Arduino Pro Micro for my project. I am looking for any Arduino library I can use in my project particularly to get DTCs and PIDs from a car. All libraries I have tried have compatibility issues with my Sparkfun board. Thanks.
I don't believe you need a library. It looks like a direct serial connection. It looks like you need to figure out the OBD codes that you get in hex and convert them into something that makes sense.
Have you tried the sparkfun tutorials? There may be other issues involved. You really should follow the how to use this forum on the top page.
Share circuit info * how you have things connected
and your sketch
You would get more help and advice if we had something to dig into.