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Need Help making the following circuit

Discussion in 'Electronic Design' started by rabbit, Jan 21, 2007.

  1. rabbit

    rabbit Guest

    I want to build a physical pressure sensor that detects pressure and
    transmits this information to a recording device (watch?). Proposed
    application: If one wants to know how many times and length of time
    that someone sits on a chair, this device (attached to the backside of
    the person) would be able to give that information.
    Thank you for your expertise.
     
  2. D from BC

    D from BC Guest

    Goofy answer:
    It's called a flight data recorder..Or black box.. :)
    But seriously...
    I gotta question from the question ...
    Isn't there some sort of proximity detection method using field coils
    or antenna? Dodges pressure sensor idea..

    Is the person at a computer?...could just interface and software it.
    D from BC
     
  3. rabbit

    rabbit Guest

    Thanks for responding D. Unfortunately my background in electrical
    engineering is VERY LIMITED. WHat do you mean by "proximity detection
    method using field coils or antenna" ?
    What I was looking for was a small device that could be attached to a
    mobile human being (maybe attached to a belt) and record the duration
    of time that person is in only that position. I appreciate any further
    input.
     
  4. D from BC

    D from BC Guest

    That's kinda like the opposite of a pedometer.
    See
    http://en.wikipedia.org/wiki/Pedometer
    http://search.ebay.com/pedometer_W0QQfkrZ1QQfromZR8QQsubmitsearchZSearch
    Maybe hack one of those things and turn it into a position- o- meter?
    Just guessing..
    D from BC
     
  5. Chewing gum?
     
  6. mpm

    mpm Guest

    You really don't need a pressure "sensor". A pressure "switch" will
    suffice.
    Take a look at the the World Magnetics products (avail from Digikey).
    These have 2 connections, which form a closed circuit when the pressure
    exceeds a predetermined value. Some models have adjustable trip
    points. These switches require no electricity to operate.

    Digikey #: 384-1019-ND, for example.

    -mpm
     
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