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total newbie needs help

Discussion in 'Electronic Design' started by s, Aug 10, 2005.

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  1. s

    s Guest

    Hi all,
    Got a bit of a problem that am hoping you can help me with...

    I need a momentary switch, easy enough I hear you say, but due to the
    nature I need it to be timed...

    Quick background, it's for the electronic gearchange on motorbikes. An
    excellent firm produces an electronic gearchange for disabled bikers.
    Gearchange is done by hitting one of 2 switches.

    The problem is if the button is held for longer than 500ms then the
    changer just keeps going on and changing gears...

    What am hoping to achieve is a circuit that can be put in-line, that
    will only allow a single "pulse" for less than 500ms..

    Hope you follow that and can help me out a bit..


  2. Bob Stephens

    Bob Stephens Guest

    Google for 'One shot'

  3. sparks

    sparks Guest

    ty... perfect
  4. Pooh Bear

    Pooh Bear Guest

    LM555 monostable mode.

  5. Naveed

    Naveed Guest

    If you don't know what your doing then you might want to think twice about
    your project.

    If your going to use this to move up gear or down gear using this device and
    it produces a spike or some kind of noise, it could causes the gears to
    shift down when your travelling at high speed, it might become abit

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