Quote Originally Posted by spfautsch View Post
Interesting stuff Tom. I recently bought a 2001 Y body and was thinking to myself how cool it would be to have an open source tool to talk to it with. But for now I'll be dusting off my Jet cable / software (based on tunercat).

Just to clarify a few bits - the arduino IDE is not sanctioned by Atmel. They also have a free but non-open IDE suite for their AVR products but it's not quite as friendly to beginners.
A little off topic but 2001 ybody pcm is currently very well hacked, with freeware support. Still a homebrew cheap cable is missing, but you can easily fill the gap.
Maybe a new thread will be more appropriate to get you started.

On topic, the progress is awesome. Great work and complete write up. Can`t wait to see that project finished.