OBD logger

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On Board Diags

  OBD-II is the protocol used by all cars built after 1996.  If you want your PC or laptop to read some of the data from the "Computer" in your car then you need some kind of OBD to RS-232 interface.   There are many OBD-II interfaces out there, but most of them are very expensive.  You can make your own interface if you know a bit about electronics and know how to make your own PCB boards.

 

   The interface board uses the Elm Electronics ELM  OBD interface chip.  I didn't add anything special to the schematic, so it's pretty much identical to the one in the data sheet.   If anyone is interested to have the schematic I can email them to you.  So far I've made a board using the ELM 322 & ELM 320 chips.  These two single sided PCB boards where made using Eagle PCB software and Press & Peel.   The ELM 322 OBD chip is for GM CARS ONLY and the ELM 320 is for FORD CARS ONLY.   I'm working on the ISO version for all other cars.  

 

  So far I've tried the boards and OBD-II logger on a 1999 Grand Prix, 1998 Grand Am and 2002 Ford Explorer without any obvious problems.  Comments from emails shows that it works with:
  1999    Ford Explorer
  1996    Ford Thunderbird LX 4.6l SOHC
  2002    Ford Mustang 4.6L V8
  2001    Skoda Octavia 1.8T
  2003    Acura MDX
  1999    Toyota Solara

   Please let me know your results... josenk@videotron.ca

 

  OBD-II Logger also works with Scan tools boards.  But remember,  they'll support their software on their hardware.

 

  There is a Perl version and a Windows version 

 

OBD-II Logger for Windows

OBD-II Logger for Unix