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I want to build a DIY OBD2 interface

P

powerampfreak

Jan 1, 1970
0
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
 
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..
Does anyone know of a DIY open source OBD protocoll PIC processor?

Best regards
The freak

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
 
N

Neon John

Jan 1, 1970
0
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?

This isn't open source but it is a turn-key solution to your problem.

http://www.obd-2.com/

This guy is a little bit nutty but has an encyclopedic knowledge of
OBD. The software is free and fully functional except that it won't
talk to an interface cable without the secret code. You can download
the software and play with it with saved data. Which brings up the
next item on your list. It will log whatever parameters you want
logged indefinitely or until you run out of disk space.

I have his universal interface cable (all three OBD-II protocols plus
CANbus). The cable consists of the proper connectors and a little
plastic box containing the PIC that translates bus data to serial
data. You'll need a computer with either a serial port or a
serial/USB cable.

Lastly, if you're a Linux person, you'll be glad to know that it runs
fine under Ubuntu Wine.

John
John DeArmond
http://www.neon-john.com
http://www.fluxeon.com
Tellico Plains, Occupied TN
See website for email address
 
P

powerampfreak

Jan 1, 1970
0
Den tisdagen den 1:e januari 2013 kl. 22:04:02 UTC+1 skrev powerampfreak:
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

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.
 
C

Chris

Jan 1, 1970
0
Den tisdagen den 1:e januari 2013 kl. 22:04:02 UTC+1 skrev
powerampfreak:

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.

http://www.elektor.com/products/kits-modules/kits/070038-72-compacte-obd2-analyser-en-fr.91476.lynkx
 
Too bad that the product is no longer available. The only alternative they
offer, requires a PC :(

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


Dan
 
C

Chris

Jan 1, 1970
0
Too bad that the product is no longer available. The only alternative they
offer, requires a PC :(

petrus bitbyter

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.
 
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
 
H

hamilton

Jan 1, 1970
0
On Tuesday, April 2, 2013 2:10:37 PM UTC-7, [email protected] wrote:

Hello All,
Interface to OBD-II connector of your vehicle: there is an open-source hardware and open source GUI software currently hosted by www.kickstarter.com at the link below:

http://www.kickstarter.com/projects/470746360/obd-ii-pic32-development-board?ref=home_location

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

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

Good Luck on your next project.
 
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