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Old 06-14-2009, 04:21 PM   #1 (permalink)
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OBDuino mod - no need of 'uino'

Hello,

last week, I found this great "OBDuiono" project on web and I modified the OBDuino32K, because I don't have any arduino hardware.

Now it runs on a Atmega644. I optimized it for (european) C1/Aygo cars (just ISO9141). I had to change some timings and optimized the requests a little: speed/rpm/throttle/intake temperature and map (C1/Aygo don't have a maf) is just requested one time per cycle. But there were many expedient changes in the newest svn-checkout release of obduino32K, so RPM is requested two times again, because ob verifyECUAlive().

I want to use a larger lcd, so I try out a 4x27 Display. Therefore I use 8 corner. But I'll recode the design soon, because it doesn't look good: You can't see the meaning of some values (e.g. "26%").



BTW: The values are not real (just from a "simulated ECU")


You can get my modification here, if you are interessted. It can be compiled by avr-gcc (std=gnu99). You don't need C++ anymore

Thanks to the developer of OBDuino,
Dominik from germany (pleasy excuse my horrible english)

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Old 06-14-2009, 04:45 PM   #2 (permalink)
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Looks pretty nice. Have you tried it in the car yet?
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Old 06-15-2009, 10:29 AM   #3 (permalink)
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To see a display of the names of the PID's (to check what 27% is of what) just press both the left and right buttons at the same time. This will bring up the names for 3/4 of a second.

There are up to 7 PIDs that are used in calculations on every time through the loop. When a user selects them, they are retrieved again just for display. Yes, not optimal at all... but simple.
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Old 06-15-2009, 12:57 PM   #4 (permalink)
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Interesting! Your bigger display and Atmega644 remind me about these german projects (full documentation and videos inside):

-> S65-Shield for Arduino (display is taken from S65 - popular GSM phone by Siemens)
S65-Shield - watterott.net

-> ATM based web radio with "big" display
AVR WebRadio - watterott.net


PS if possible pls. share more details about your board
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Old 06-19-2009, 11:41 AM   #5 (permalink)
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This week I got some MC33290. I was scared to try it with a simple transistor level converter in car, because I don't want to damage my ECU.
Today I tried it in my car with MC33290 and it works fine!

@Mesuge: Thanks for that hint! Now I ordered such a display (a Sharp LS020..). I found this information/libs to drive it (without arduino):
Display Programming . Maybe I will experiment with that in future. But for a car gauge it's to small.

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