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Thread: arduino to read car sensors

  1. #31
    Variable Bitrate
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    no problem of course dude my audi was from 1992, but i think that many other models of audi 80, with enother engines (1.8lt ++ ) indeed had diagnostics!!

  2. #32
    Raw Wave
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    Reading the codes could be a solution...

    I didn't answer Settra's earlier issue with reading resistances - ie, "... the resistive sensors are a problem for many reasons. mainly because, since their resistance changes, you cant use a diode to isolate the grounds...". Hence the desire for the common grounding of sensors and the avoidance of non-linear insertions - eg. diodes.
    But the sensor's voltage can be compared to a map or maybe calculated to derive an appropriate output eg, 0.6V = 0; max 7V via 18/25 voltage divider as about 3.0V = 100%; 3.9V => 55%, etc. That's the beauty of using uPCs like Arduinos, PICs, etc - the input signal mapping is programmable.
    As long as the measuring doesn't effect the line's voltage or current (ie, as high Ohmage/impedance as possible) things should be fine. (If not, use a voltage follower or buffer.)
    Isolating thru diodes should generally not be necessary.

  3. #33
    Constant Bitrate AutoWiz's Avatar
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    hi settra. I believe I can help you. I have access to all the information you need for your project through shop databases, and my awesome snap-on vantage pro. most automotive sensors run on 5v and will work beautifully with arduino. but, if you tell me year, make, model, engine, and what sensors you need what info on, I will post here for you. shop manuals will tell you how to take the car apart, and if your lucky maybe have some wiring diagrams or a list of trouble trees for codes thrown, but usually they do not include sensor calibrations. in fact, even shop databases like Mitchell or shopkey and alldata don't have sensor calibrations past what is needed for testing and diagnostics. the 2 channel lab scope I bought from snap-on and have updated twice a year has really proven to be indespensible in this area. it holds and stores pinouts for ecu's, pinouts for every sensor connector, description and operation of every sensor, a ruff calibration (but good enough to setup a tune with), and even an example waveform of what that sensor's signal should look like. for every car. that's why the updates. let me know what ya need.

  4. #34
    Variable Bitrate
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    autowiz, thanks for the help, but if you look in the previous posts, we have been over this...
    i have actually completed this project months ago (Actually now, i am upgrading even further), so no need for help for the record, 5v are sensors, of newer cars , that have logic ECU modules and stuff. in older cars, (mine etc) , the sensors where 12v UNREGULATED

  5. #35
    Constant Bitrate AutoWiz's Avatar
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    yup, just read the first page and skipped to the end. my bad.

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