Hi,
New comer here, I wanted an SGII but I find it pricey, then I discovered your project, pretty cool!
I will have to buy a *duino kit to test, with an LCD screen. And I guess an ELM323 for my car. A few months ago I started to look at various obd2 solution including ELM, jeff interface, palm, 486 laptop, etc.
(I am currently working on a digital and analog I/O low level module on an Atmel AT91, an ARM 32bits RISC, so I know the stuff, and if I have time I will work on your code too).
Great project guys, continue!!
EDIT:
I am wondering if we really need an ELM chip, or if we just communicate directly in the OBD-II protocol, like the "Atmel AVR 2004 Design Contest Project" at
http://www.circuitcellar.com/AVR2004/first.html
Maybe wait also for the Atmel 328P to have more RAM?
We should bring also the "xarias" guy here for some help.
EDIT2:
Here's how to connect the OBD-II connector directly to an Atmel:
http://prj.perquin.com/obdii/
(see Microcontroller-OBD interface, second picture)