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Cheap pressure sensor

Discussion in 'Electronic Basics' started by Dan Ritter, Jan 20, 2005.

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  1. Dan Ritter

    Dan Ritter Guest

    I was wondering if there was a cheap way to messure pressure. Perhaps
    up to 50 psi. I have this cheap digital tire pressure sensor that seems
    to work good. I'm sure they didn't put a $50 or $100 pressure sensor in
    it. I don't need really good accuracy. Within a couple % would
    probably be fine.

    Any ideas? Thanks :cool:
     
  2. Richard

    Richard Guest

    How many total, will you need?
    If you need 300 or more I can help

    Richard
     
  3. Dan Ritter

    Dan Ritter Guest

    No. I'm afraid it's just for a few small projects. Is that what the
    tire pressure sensor has? If you buy thousands you can get the sensors
    for a few dollars instead of $100?

    The best idea I've had so far is I've noticed some surplus electronics
    places have had these sensors for sale. Right now they just show sold
    out though.

    Like I said. I don't need really good accuracy. Even within 10% I
    would be willing to accept if it was a cheap thing. Basically I just
    don't want my device to overpressure too much.

    I wouldn't mind hearing what you have. Mostly just curiousity. I don't
    think I could afford 300 of them.

    I hope someone has an idea that will work.

    Thanks :cool:
     
  4. BEVERNON

    BEVERNON Guest

    Subject: Re: Cheap pressure sensor
    Try cooper instruments. Do a search for 'force sensor' and you will find
    several companies who make force sensors and pressure sensors. About 10
    dollars per.
    Brad
     
  5. Si Ballenger

    Si Ballenger Guest

    Go to WalMart ande look in the auto section for digital tire
    pressure gages. I think I've seen them there in the ~$10 range.
    I'd also look in the "dollar" type stores for them. The below
    link might also be of interest (maybe free sample).

    http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=MPX4250&nodeId=01126990368716
     
  6. Gary Helfert

    Gary Helfert Guest

  7. Dear Gary

    One method that might work depending how much trouble you are willing to put
    into the project would be to use a oil pressure sender device from as used
    in certain automotive engines.

    These devices used to use carbon or graphite buttons compressed by a
    diaphragm to measure the oil pressure of such a engine.

    Carbon has the interesting characteristic of changing resistance when paced
    under mechanical pressure. This characteristic was and probably still is
    used in the transmitter of certain telephone mouth pieces and microphones.

    Usually in the case of engine oil pressure the unit is simply in series with
    the battery and the measuring gauge. However it is conceivable that you
    might be able to arrange several of these into a bridge circuit for better
    accuracy.

    If you are looking for quick and dirty, then a trip to a plumbing store to
    buy a bourdon type presure gauge, might be the most direct method of
    achieving your goal.

    Albert
     
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