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BEatonNo1
Nobel Prize Winner
USA
1133 Posts |
 Posted - Oct 27 2003 : 12:27:01 AM
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Im making a heads up display for my truck. I plan to have it display speed, distance until empty...the stuff that those driving calculators do. The display works fine, but I cannot figure out how to get the raw data to the pic. I have seen those driving calculators, but I cannot find any info on them. do they get the fuel left in the tank and speed from the computer connection?
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Kale
Nobel Prize Winner
Canada
795 Posts |
Posted - Oct 27 2003 : 1:34:49 PM
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It's usually integrated into the electronics package that runs your engine. You need the manual for your car's electroncs system and then you need to find the various data lines. The simplest way to do it would be to hack into the lines that run to the displays on your dash, then duplicate the display on your HUD. Oh, you'll probably void your warrenty too if you still have one on it.
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Oct 27 2003 : 1:50:42 PM
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Depends on the truck. If you have an ODB or ODBII vehicle, then all that info is available at the diagnostic port. If it is an older truck, then you'll either have too tap the lines to the ECU, or install the various sensors yourself.
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Kale
Nobel Prize Winner
Canada
795 Posts |
Posted - Oct 27 2003 : 4:51:13 PM
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What does ODB stand for? Are the communication specs for it available? You'd need to know the transfer protocol it used for its data, and the format it presents it to the bus. Is it based on the CAN bus system?
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BEatonNo1
Nobel Prize Winner
USA
1133 Posts |
Posted - Oct 27 2003 : 5:57:22 PM
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well it is a 2000 and I know it has a port of some sort, However I'm not shure if its 1 or 2
Last night I finally found a site doing a similar project, but he didnt have much data on the raw data, or any code. now that I know what the port is called I should have some better luck.
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ecm
Apprentice
Canada
89 Posts |
Posted - Oct 27 2003 : 6:18:53 PM
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ho by the way its OBD wich stands for on board diagnostic.
to do or not to do |
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BEatonNo1
Nobel Prize Winner
USA
1133 Posts |
Posted - Oct 27 2003 : 8:52:55 PM
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Ok well I have determined that my car has a OBD-II ISO connection. Unfortunately, I am having a difficult time finding any information on the data protocols. any ideas?
Thanks, Brian
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Oct 28 2003 : 09:04:29 AM
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Check out the forum at http://www.mp3car.com and do a search for ODB. They have done many of these projects.
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BEatonNo1
Nobel Prize Winner
USA
1133 Posts |
Posted - Oct 29 2003 : 11:40:22 PM
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well all of them seem to be using some program, and none of which provide any code or examples...
this is proving to be a pain in the rear, I have found lots of error report codes but thats about it, people are really stingy with this information
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Oct 30 2003 : 09:03:49 AM
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That's because the manufacturer is pretty stingy with it as well. It is a standard protocal, so if you check the ISO standards site you should find it. Nearly everything about the car is available via the ODB port. It gets crazy in new cars....you can even turn lights on and off, move windows, etc.
http://www.tweecer.com/StreetDyno/index.html
That site might help. It is a dyno that uses data from the ODB port to make it's measurements.
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heads up display
