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    911 y a t q's Avatar
    911 y a t q Posts: 1, Reputation: 1
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    #1

    Sep 13, 2007, 06:40 PM
    Speedometer built
    How can I build one Speedometer?:confused:
    KISS's Avatar
    KISS Posts: 12,510, Reputation: 839
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    #2

    Sep 13, 2007, 06:53 PM
    A speedometer is basically a frequency counter with a time base that results in MPH.
    The sensors in modern cars gives a pulse for some amount of distance traveled.
    You'll need some signal conditioning to the counter.

    I don't know, but the OBD system probably includes MPH. Tou might be able to use the diagnostic connector to get this information.
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