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Thread: Old car/engine, non ODB, how to get RPM/speed/temp/etc into carputer

  1. #41
    Raw Wave
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    Yes I also noticed this on the ITPS where theres no pull-down on the IGN input. After modifying the code it caused all sort of problem on the s/w switch debouncer I added. This resolve the issue when a pull-down is inserted.

    Also maybe you already knew this...I found the outputs of the PIC tend to lockup when you go over the 20-25mA limit. You may not realised you gone over it. So a current limiting resistor might be wise to add unless you are not having problem with the output latching.


    I'll search for that jpg and email it to you

  2. #42
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    Ricky327, sorry, didn't mean you, I was talking to umsam...

    btw, how do you post pictures on this damn forum?

  3. #43
    Raw Wave
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    No problemo

    Use the "Go Advanced" button then use "Manage Attachments"

    Just follow the guide from there

  4. #44
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    I dunno if you guys came up with a solution to the wire speedometer or not...
    But I was thinking, would it be possible to attach a small rheostat to the cable and use it to adjust the rheostat's resistive load in a potential divider circuit, then a simple voltmeter could be used to measure speed.

    Alternatively, for the higher tech, what about an accelerometer (or G-meter)? These devices measure acceleration (duh!) by measuring the forces in a solid state device and producing an electrical output.
    Here are some for the car dash:
    http://www.gtechpro.com/products.html
    The competition model also monitors RPM, without interfacing to the tachy (uses the voltage from the cig lighter socket to calculate alternator speeds!) the reguler one just uses an accelerometer. It's pretty much a digital dash with logging and more all in one..

    This is one that produces an analogue output that could be measures using a voltmeter or a data logger:
    http://www.summitinstruments.com/smart/X5203A.htm

    I'm sure you could find one that interfaces directly to serial port or usb or something if you looked hard enough.

    Then not only do you have an accurate speedo, you can find the G's you pull when cornering and acceletarint and your acceleration/deceleration times for your wagon with relative ease
    All round funky bit of kit!

  5. #45
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    Thanks for the info Ormo, I think the easier way to get a speed data is to run a GPS reciever and get the data from there. You can parase the data and display with a simple VB program. Did anyone think of getting a OBDII computer from a newer car and get all the wiring and sensors from it. I was thinking of getting a factory manual for a car with OBDII and figure out which sensors I need and find it at a junk yard. All the sensors I don't need, I can fool the ECU think that the sensor is there. What do you guys think?
    66 Mustang

  6. #46
    Low Bitrate doig's Avatar
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    an accelerometer can be got at http://www.sparkfun.com/shop/index.p...=41863&cat=71& for less than the cost of a car. That summit one was $1700 US. 2 axis ones can be got as free samples, and then its up to us to work out where to go from there...

  7. #47
    Newbie bobjimwilly's Avatar
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    Question for umsam and Confused: did either/both of you ever come up with a hardware and software solution for the original problem? I know this question is a whole year later than the last post but I am desperate

  8. #48
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    Quote Originally Posted by bobjimwilly
    Question for umsam and Confused: did either/both of you ever come up with a hardware and software solution for the original problem? I know this question is a whole year later than the last post but I am desperate
    Probably a cheaper way of approaching it is to install something like a DIY MegaSquirt programmable EFI "computer". Then stick an old palm in the dash for a read out or hook it to your CarPuter.

  9. #49
    Newbie bobjimwilly's Avatar
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    Quote Originally Posted by eminence
    Probably a cheaper way of approaching it is to install something like a DIY MegaSquirt programmable EFI "computer". Then stick an old palm in the dash for a read out or hook it to your CarPuter.
    All I want to do is interface with the existing tachometer,fuel gauge and temperature gauge, not install a completely new engine management system. Also, I have a single carb engine, not injection, so I don't think the MegaSquirt system is relevant to my car? Or is it?
    My '84 Austin Mini Carputer Project : http://www.mp3car.com/vbulletin/showthread.php?p=541067

  10. #50
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    You could fit an an injection manifold. Anyway there is a steep learning curve with MS. It is just a suggestion.

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