Wheel Speed Measurement

Discussion in 'General Electronics Chat' started by Loftie, May 27, 2015.

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  1. Loftie

    Thread Starter New Member

    May 26, 2015
    Good day

    I want to measure wheel speed by using a variable reluctant sensor with a sprocket to determine the speed of a wheel and then convert the frequency to a voltage using a LM2907/LM2917 IC. Then I want to feed this voltages into the 5 V input of my arduino. Any tips on how to approach this problem? The max RPM of the sprocket will be no more than 2000 RPM. Using a 60 teeth sprocket which means that the max frequency should be 2 kHz. I know by using a variable reluctant sensor, signal conditioning is necessary.I just want to know how to measure it and if what I'm doing is the right approach.

    Kind Regards
  2. pwdixon


    Oct 11, 2012
    Converting to an analogue voltage is bound to reduce your accuracy, it would be better to measure the frequency directly and skip the f/a conversion.
  3. Sensacell

    Senior Member

    Jun 19, 2012
    Just get a digital signal out of your transducer and feed it into an IO pin.
    Use the counter / timers to calculate the speed.
    Simple and accurate.
  4. DickCappels


    Aug 21, 2008
    We are forbidden to discuss this on the website. Re-post this a third time and you will be suspended or banned.

    Previous closed post:

    Welcome to the AAC forum.

    The owners of All About Circuits have elected not to host discussions of automotive electrical system modifications/enhancements due to safety concerns, the potential of legal ramifications and the possible circumvention of vehicle regulations at the state and federal level.

    This thread is against the AAC forum rules, Chapter 6, as seen here:

    6. Restricted topics. The following topics are regularly raised and however are considered “off-topic” at all times and will results in Your thread being closed without question:

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    Automotive modifications of any kind are strictly forbidden. Therefore, this thread will be closed.

    Please try to understand the reasons behind this action, and feel free to browse and use the forums.

    You might find answers to your questions in one of these forums:


    Another good forum that shares many of the same membership is http://www.electro-tech-online.com/ . Good luck.
    Gdrumm likes this.
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