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Will Pay for Help Need Design

Discussion in 'Electronic Design' started by [email protected], Feb 8, 2007.

  1. Guest

    I've been reading a lot of articles online and books but can;t seem to
    pull off what i need. So i figure i will just pay someone to do it for
    me. It actually pretty simple.

    I need to be able to sense the impact/pressure being exerted, and
    light a corresponding LED. I would like to have 3 LED colors and
    display a different color depending on how much pressure is being
    exerted.

    For example if there is a high impact a red LED will be lit, Medium-
    blue and Low-white. I would prefer to use a Microcontroller so that i
    can add features later on and be able to edit the amount of pressure
    needed to trigger each LED.

    I'm thinking between $100-$200 let me know if you are interested. Also
    any input you may have will be appreciated.

    Thanks in advance.
     
  2. What sort of impact/pressure/sensor?
     
  3. For that price you might be able to get the bare bones of a simple
    analog design, including full adjustability, but I'm pretty sure that
    a
    digital design will have a higher design price tag. In fact, you
    could
    probably get an analog design here on s.e.d. for free. Or at least a
    conceptual design, perhaps requiring a few nitty-gritty details to
    work.
     
  4. D from BC

    D from BC Guest

    Money! $$$$ :)
    This project reminds me of this:
    http://www.national.com/pf/LM/LM3914.html
    Didn't somebody already post that chip... not sure.
    Anyways..
    I program PIC microcontrollers the long hard way...in assembly
    language so it's going to cost more than $200.00
    (Sneaky smiley :) )
    Also, I have a $1000.00 min.
    Maybe you'll luck out and a student will make this a term project for
    $200.00.
    D from BC
     
  5. Guest

    Not too sure. Anything to get the job done i guess. it's will be used
    to sense impact rather than pressure.
     
  6. Guest

    I would really prefer a digital design. And i am looking for more than
    just a design i would like a prototype. It's for my sons science
    project. I Can pay $300 for digital.
     
  7. Guest

    Are'nt there easier ways to program a PIC microcontroller besides
    assembly?
     
  8. D from BC

    D from BC Guest

    Yes..
    For your application , doing the code in a high level language like C
    would be preferred to reduce software development time.
    I'm only set up for assembly coding and didn't learn C compilers for
    PIC uC's yet.. Goofy me...
    D from BC
     
  9. linnix

    linnix Guest

    Your biggest challenge is finding the right sensor.
    What kind of impact (in G, PSI, N) and how (soft or hard contact)?
    How are the sensors arranged in the application?
     
  10. What will he learn from this?

    Connect a cheap crystal microphone (Radio Shack) to an oscilloscope (eBay)
    and you're done except for mounting the mic.
     
  11. Guest

    I'm thinking PSI sensor would be best. the application is complicated
    but i guess the closest application would be a light saber that would
    flash the different colors based on the impact.
     
  12. Eeyore

    Eeyore Guest

    It's begging for a simple analogue solution.

    I'll design you the circuit for that much ( $200 ). Finding the right pressure
    transducer will be the tricky bit, you'd need to specify how it's required to
    physically mount etc, pressure thresholds etc.

    Graham
     
  13. Eeyore

    Eeyore Guest

    100% agreed.

    Selecting an appropriate pressure transducer will be the most time-consuming
    part.

    Graham
     
  14. Eeyore

    Eeyore Guest

    If you have a compiler, yes. E.g.
    http://www.melabs.com/products/pbc.htm

    I never do understand why ppl use asembler when a decent and inexpensive high
    level language is available.

    Graham
     
  15. Eeyore

    Eeyore Guest

    It's actually better suited to an analogue design ! If you went digital it would
    still make sense to have an amalogue 'front end'.
    The digital bit wouldn't be doing anything clever.

    Graham
     
  16. Eeyore

    Eeyore Guest

    C would be insane overkill for such an application but I can see ppl doing it.

    I love that (void) bit !

    Graham
     
  17. Eeyore

    Eeyore Guest

    Hey, if he wants to measure impacts from a hammer, that mic isn't going to last
    long.

    Graham
     
  18. Eeyore

    Eeyore Guest

    A typical PSI sensor measures gas pressure.

    Perhaps you could explain the type of impact you want to measure ?

    Graham
     
  19. p1dRobert

    p1dRobert Guest

    It sounds like you need to measure shock, not pressure. Something like
    the murata shock sensor PKS1-4A10 would seem appriopriate. Its cheap
    and available from FARNELL or other such electronics stores. Its a
    Piezo ceramic element that generates voltages when deformed. Of course
    you still need to attach the processing electronics. As the others
    have suggested in this post, I'm thinking an analog solution would be
    better, unless you know how to program microprocessors.
    As to paying someone to do it, I doubt you'll find anyone who'll do it
    for that sort of money. I'm forever seeing potential clients walking
    in to my design office thinking I can just whip something up in a few
    hours. Theres a lot of pain staking detail to any project that few
    people ever know about.
    Besides I think you're doing your son an injustice. He needs to do
    this himself. How else is he going to learn anything and grow through
    the experience.

    Regards
    Robert
    http://www.priority1design.com.au
     
  20. D from BC

    D from BC Guest

    I had an app where fastest code execution and precise timing was
    important on the smallest uC.
    So...I dodged the compiler...
    However, I've had apps pop up where a compiler would pay off big
    time...

    D from BC
     
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