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switch to detect movement of a wheel

Discussion in 'General Electronics Discussion' started by R31VER, Sep 29, 2015.

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  1. R31VER


    Sep 29, 2015
    I am looking for some sort of device / switch to detect if a bicycle is moving. Ideally when the bike starts to move the switch goes to on then when movement has ceased for a set period of time (may be 1 to 5 minutes) the switch would reset itself to off. (would be looking for a capacity of 5v at 500ma)

    I had thought I would find some sort of switch similar to how a bicycle computer works, this picks up a pulse from a reed type sensor on the wheel and starts the timer and when the wheel comes to rest the timer is stopped.

    Ideally I would like some off the shelf component rather than building my own circuit however advise on either would be much appreciated. Or indeed any other sort of work around.

    I am not wishing to fit a dynamo as it would not only seem a bit overkill but that would not give me the "ON" period after movement had stopped.
  2. Bluejets


    Oct 5, 2014
    How much movement do you require before the timer starts..?
    A magnet on the wheel (or several) will work with a reed switch but will require a certain amount of movement depending on the former.
    An emitter/detector IR led combination should pick up each spoke for better resolution.
    Connect to the trigger input of a 555 timer monostable.
    Talking electronics has many free 555 circuits to get you started. - 555 Circuits/50 - 555 Circuits.html
  3. AnalogKid


    Jun 10, 2015
    What power is available for the module?
    Is a relay acceptable for the switch? How about a power transistor?
    Size or weight restrictions?
    Weatherproof requirement?

  4. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
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