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School Project: Help needed

Discussion in 'Electronic Design' started by Bricket, Mar 30, 2006.

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  1. Bricket

    Bricket Guest


    Can someone point me to the right direction. For an engineering class,
    I must design and create a project to help the blind using
    sonar/echolocation. Any websites or any direction at all would be

    Thanks in advance.

  2. Ian Stirling

    Ian Stirling Guest

    Catch and train a bat.
  3. Tim Wescott

    Tim Wescott Guest

    That's a pretty broad subject, and not one that you're going to be able
    to tackle fully as a class project -- which means that what you're
    _really_ being asked to do is some little part of it.

    First, I'd listen closely to what the prof has to say -- he may be
    giving you the parameters of the project without being explicit about it
    (I hate that).

    Second, he wants you to do something with SONAR, probably ultrasonic.
    I'd web search on SONAR, ultrasonic, possibly 'ultrasonic range finding'.


    Tim Wescott
    Wescott Design Services

    Posting from Google? See
  4. Luhan

    Luhan Guest

    Here is one with complete plans...

    Good luck,
  5. Bricket

    Bricket Guest

  6. Bricket

    Bricket Guest

    The teacher is interesed, I imagine in organizing the project from
    begining to end. Which mean that at least a crude apparatus must be
    built and functional. Believe it or not, he would like the thng to have
    a speech instead of relying on vibration or intensity of vibration
    like some commercial unit have.
  7. Joel Kolstad

    Joel Kolstad Guest

    I wonder if he's asked any of the intended users what *their* preferences
    might be. I'd think speech wouldn't be nearly as useful since it's simply so
    slow in providing feedback, but I wouldn't really know either.

    I have been surprised that you see talking RF power & VSWR meters out there,
    and apparently they sell significant quantities!
  8. Hi Joel,
    Well, a lot of the stuff for the visually impaired finds its way into
    the 'normal' population. A few years ago, talking watches and
    calculators were all the rage, especially for kids! And, if I am tuning
    an RF stage, it can be right handy to be able to see which slug I'm
    turning without having to look at the meter... :cool:

  9. Ian Stirling

    Ian Stirling Guest

    Speech is insane for a dumb unit.
    If it could say "there is a door to your left" reliably, then maybe not.
    But realistically, for a simple unit, all you're going to get is a
    range to nearest obstruction, and indication of how much nearby
    reflection there is.
    Speaking this every second or so is going to be very tiring to listen
    Not to mention less usable than vibration, where you can easily turn
    your head, and get a scan of the area.
  10. Joel Kolstad

    Joel Kolstad Guest

    I have a suspicion the "requirement" for speech probably is just the
    professor's own, uhh... appreciation of speech synthesis or some such.

    Many years ago for an opto-electronics lab I built a heartbeat detector based
    on an IR LED and phototransistor (you put your finger on it) and a bunch of
    fancy op-amps performing low-noise amplification, filtering and detection; it
    fed a flashing LED and a beeper every time it detected a beat. I showed it
    off at the appointed time, and the main feedback I received was, "nice... but
    shouldn't there be a digital readout of beats per minute!" Arrrrggh!

  11. You should have added a one minute gate and told him it was for the
    blind to count the beeps so they would know their pulse rate. ;-)

    Service to my country? Been there, Done that, and I've got my DD214 to
    prove it.
    Member of DAV #85.

    Michael A. Terrell
    Central Florida
  12. Fred Bloggs

    Fred Bloggs Guest

    That would be a simple pressure sensor inserted into the anus of the
    seeing eye dog, then into an embedded PC for translation to human speech.
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