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Thread: Method To Read Speedometer Cable Spin?

  1. #11
    Variable Bitrate
    Join Date
    May 2005
    Derbyshire, UK
    In case you can's DIY it, there are ready made transducers for this. They are used for taxis, cruise control systems and trip computers...

    ^^ That one fixes onto the back of a VW speedo and the cable goes onto the other end as if it is clipping onto the speedo...

    They produce units that give 1,2, 4 or 8 pulses per revolution.

    They are only Hall Effect sensors though....
    Old setup
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  2. #12
    Admin. Linux loser.
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    Bugbyte's Avatar
    Join Date
    Sep 2004
    Corning, NY
    Blog Entries
    Nice find!
    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
    Want to:
    -Find out about the new iBug iPad install?
    -Find out about carPC's in just 5 minutes? View the Car PC 101 video

  3. #13
    Constant Bitrate stapan's Avatar
    Join Date
    May 2005
    if you open up your gauge cluster you might find your voltage source already in there. I have seen high end alarms which tap into one of those wires, Im pretty sure its for the function where the doors are automatically locked once the vehicle reaches 30 mph.

  4. #14
    MySQL Error Scouse Monkey's Avatar
    Join Date
    Mar 2004
    VSS sensor. that is what you hook up to dead reckoning (DR) GPS modules (what Boris was on about). 1990 euro built car may just have a mechanical linkage and no VSS. Hall effect route would be my choice. You could do a simple calibration with your GPS by altering the timing whilst driving at a range of speeds. The DR systems automatically do this calibration to allow them to compensate for differnet cars, tyre pressures etc etc whenever they get good GPs reception. Why not check out the U-Blox GPS stuff (JCDillin is designing the interface board for the module) and then build a simple hall effect sensor for the VSS input. Then all of the hard electronics work is done for you by the GPS and you should hopefully get a badass GPS to boot

  5. #15
    Newbie phoneboi's Avatar
    Join Date
    Aug 2005
    Eau Claire, WI
    Indeed the 1990 Fox has a mechanical linkage. I've scrounged up a few old ball-type mice. For now I just want to do a proof of concept (and understand the circuity) by just setting up the slotted wheel, the ir emitter and reciever to a resistor/led combo so I can at least tell if it's getting pulses. I'm not exaclty sure what voltage these components are, but I'm going to assume somewhere around 3.3V. Time to break out the breadboard and do a little tinkering before I try wiring up the pic controler.

    And if it doesn't work.. that suggestion by markbuts3 is excellent. Though it does lack that *geek* quality I was going for.

    Managerium is known for its denseness.
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