I want to build a DIY OBD2 interface

Hello all. Happy new year to all of you out there !!

Now to the serious stuff: I need to continously read out some of the OBD2 data available in my car. It's about long and short term fuel trim datas. Well, I know the ELM327 can be used, and use it as a OBD protocoll device. BUT - it would be even more elegant to use a custom PIC microcontroller already running a firmware which communicates over OBD through a interfacechip like MC33290 or so. I don't need to read out datas on a LCD, I just need the datas as input to my processing. Like this:

  1. I initiate a read of short-term fuel ratio.
  2. I get back a string of data from car ECU through OBD protocoll.

Does anyone know of a DIY open source OBD protocoll PIC processor?

Best regards The freak

Reply to
powerampfreak
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Elektor magazine has done various OBD projects over the years - you may also find pinouts.ru a useful source of info.

Reply to
Ian Field

It's about long and short term fuel trim datas.

.

If you value your time at all , go with a blue tooth ELM327. You can get one from China for about $12. Any DIY device is likely to be programmed for only one brand of car.

Dan

Reply to
dcaster

Den tisdagen den 1:e januari 2013 kl. 22:04:02 UTC+1 skrev powerampfreak:

about long and short term fuel trim datas.

already running a firmware which communicates over OBD through a interfacechip like MC33290 or so.

processing.

Thanks for all advice. Though I want it all to be a standalone device without the need for a PC. This is all part of a possible new productdevelopment. Maybe the ELM327 solution will be the most easy way to go, then all protocoll "stuff" is already taken care of. And all I have to do then is to build an RS232 communication with my own PIC to read out and interprete the data.

Reply to
powerampfreak

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Reply to
Chris

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Too bad that the product is no longer available. The only alternative they offer, requires a PC :(

petrus bitbyter

Reply to
petrus bitbyter

y

Try Ebay item 170923726521. Shipped from New Jersey , less than $20, and no assembly required.

Dan

Reply to
dcaster

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Reply to
hamilton

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All depends how keen the OP is to DIY.

He/she can still download the construction article & source the parts etc...

The designer of the project may also still be contactable to get access to any microcontroller code required.

Chris.

Reply to
Chris

about long and short term fuel trim datas.

already running a firmware which communicates over OBD through a interfacechip like MC33290 or so.

processing.

Reply to
toan

Hello All, Interface to OBD-II connector of your vehicle: there is an open-source hardware and open source GUI software currently hosted by

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at the link below:

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It will help you to get real time raw data from ECU of the vehicle.

It's about long and short term fuel trim datas.

already running a firmware which communicates over OBD through a interfacechip like MC33290 or so.

my processing.

Reply to
toan

hardware and open source GUI software currently hosted by

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at the link below:

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Well Toan, looks like your NOT going to make it.

Good Luck on your next project.

Reply to
hamilton

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