OBDII Connection on Atmel AVR

Developer topics relating to hardware that interfaces PCs to ECUs

Moderator: Freon

OBDII Connection on Atmel AVR

Postby JoeBee » Tue Dec 26, 2006 1:06 am

Hallo to all.
I am planning to build an interface witch is compatibel with with the MUT II Protocol.
This interface should use an ATMEL AVR Microcontroller. This interface can show/mem some parameters the ECU can send out then. (logging)
It is so hard to build an USB interface on an AVR Microcontroller, so my question ist:
Are there schematics and functions (like libmut) out, for interfacing an AVR to the OBDII?
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Postby Fitz » Tue Dec 26, 2006 10:45 am

FWIW, ATMEL has other families with a built in USB core.

As far as interfacing to OBD-II, the OpenPort adapters (schematics posted here), the 'Jeff Adapter' (OpenDiag.org), and a couple of other public efforts are all basically UART to ISO 9141 adapters.

All should be readily adaptable to an Atmel AVR UART as well - though you will need to look carefully at the baud rates generated.

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