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Building a pool lap timer

Discussion in 'Electronic Basics' started by shez, Nov 4, 2005.

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  1. shez

    shez Guest

    I wanna challenge myself and make something that allows be to monitor
    my laps in the pool via a computer.
    I was think of something like a waterproof pressure mat hanging in the
    water, connected to a USB or Serial port connected to the computer.

    Any help would be great

  2. David

    David Guest

    A Recent Silicaon Chip had just such a project
  3. shez

    shez Guest

    Where can I find this project
  4. suprisingly enough!!
  5. Jasen Betts

    Jasen Betts Guest

    You want to use a mains powered appliance in the vacinity of a swimming
    pool? ensure that the computer is correctly earthed and/or use an
    isolating transformer or RCD ....
    maybe replace one of the buttons of an old mouse with wires leading to the
    pressure pad.

    from the safety standpoint and to keep the PC away from corrosive chemicals
    it may be better tu use an air-filled pressure pad connected by a long hose
    to a remotely located pressure switch connected to a old mouse (or directly
    to pins used for the fire button on the joystick port etc...).

    suitable pressure switches can be salvaged from many models of washing
    machines (used in the water level detector)

    as for the pressure pad, maybe a wheelbarrow inner-tube between two sheets
    of stiff plastic (acrylic/lexan/fibreglass) etc

    (the pressure switch could probably be made this way too)

  6. shez

    shez Guest

    Thanks very much
  7. Woody Brison

    Woody Brison Guest

    So can you pop it a couple of times while the coach is looking
    elsewhere? or will repeat hits within say 30 sec. be locked out
  8. Jasen Betts

    Jasen Betts Guest

    not by the hardware, That's a software issue... if there's a pad at each end
    that'd stop that sort of cheating.
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