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Digital display for pressure sensor help needed

Discussion in 'Electronic Basics' started by [email protected], Dec 14, 2006.

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  1. Guest

    I want to build a cuircut that will digitaly display air pressure
    (0-200+ PSI) from 4 or 5 different sources on one small screen. Here
    are my questions:

    - Is this project feasible for someone with little knowledge of

    - Accuracy is not critical within a PSI or two would be fine. Would it
    be simpler to use analog sending units or digital sensors?

    - How would the cuircut work? Would it somehow take the signal from the
    sensors and convert it to pounds per square inch and then send it to
    something that would display that information on a LCD screen?

    - What would be a rough estimate of the cost of this project?

    Thank you,

  2. Guest

    No hope of a novice making it. Pressure sensors use a strain gauge in a
    bridge circuit. Cost is difficult, If you bought it ready made I doubt
    you have much change from $2000.
  3. Homer

    Homer Guest

  4. Chris

    Chris Guest

    Hi, Erik. If you're a newbie looking for low cost, your best bet might
    be to put 2 or 3 rail-to-rail op amps on a perfboard to convert your
    analog output signals from the sensors to a 0-200mV signal (if you'd
    mentioned the sensor you might have gotten a sample circuit). You
    could then use four or 5 ICL-7106- or ICL-7107-based LCD or
    LED-7-segment 0-200mV input displays which would show the output in PSI
    or whatever units you calibrated with the component values and tweaker

    WAG cost estimate:
    Regulated power supply: $10
    Perfboard, op amps, passive components, tweaker pots: $25
    4 ea ICL-7107 based LCD displays @$25 ea.: $100
    Fudge factor: $15
    WAG total cost: $150

    Scrounge for components and the displays and you can easily halve this.

    A single display will require some programming and complexity
    somewhere. For a newbie, your best bet might be to use a serial output
    analog-to-digital converter (ADC) with a Picaxe or BASIC Stamp. You
    could then control one of the Scott Edwards Stamp-controllable serial
    input LCD displays. I'd suggest these additions are probably going to
    double the WAG estimate above. And that also assumes you have some
    facility with programming.

    How about this: tell a little more about the project, and what kind of
    sensor you are choosing. Describe in a little more detail your
    electronics capabilities. You then might be able to get a little more
    specific help.

    Good luck
  5. Baron

    Baron Guest

    Just buy a digital tyre pressure gauge ! £9.95 in Woolies
  6. Si Ballenger

    Si Ballenger Guest

    ~$6 at walmart.
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