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inexpensive PIC based OBD-2 interface

alfa147x

alfa147x

Lifer
OBD-II became the mandatory I/O diagnostic port on cars starting around 1996 in the US. Considering that the interface consists of a couple of I/O lines, serial/usb adapters have been ridiculously expensive for quite a while - especially newer USB versions. [Renan] sent in this PIC18F2450 OBD-II interface. The designer says he can provide boards for just over $6 and programmed PICs if there's interest. The chip is a few dollars, and everything else is pretty cheap too. Need to work on your car? This thing will cost $15 or so. I think I just might have to burn out a board on my mill later
Click to expand...

http://www.obddiag.net/projects.html
http://www.hackaday.com/2007/1...based-obd-2-interface/

If the guy emails me back I plan on making one of these... hope some one could use this
 
any idea what speed the interface is?
I have a really old Elm based OBD-2 reader with an RS-232 connection. I run it with software from scantool.net. Painfully slow updates, minimal number of sensors. It does definitely do the trick for reading and clearing codes, and checking if sensors are at least in the ballpark, though (worth $15 for sure)

What software are you planning on running?
 
Originally posted by: redly1
any idea what speed the interface is?
I have a really old Elm based OBD-2 reader with an RS-232 connection. I run it with software from scantool.net. Painfully slow updates, minimal number of sensors. It does definitely do the trick for reading and clearing codes, and checking if sensors are at least in the ballpark, though (worth $15 for sure)

What software are you planning on running?
Click to expand...

The one on the site seems great
http://www.microsoft.com/whdc/...am/vidcap/UVCview.mspx
 
While neat to play with and make your own, if you are just wanting to read codes cheaply, you can get little $50-75 multi line LCD OBDII pocket dongles that can do things like read/clear codes, display VIN, display MIL status, etc.

But I totally understand pulling out the breadboards and PIC flashers and seeing the codes on your own display dangling by it's connectors 😛
 
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