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Gated Ultrasonic Transmitter

Discussion in 'Electronic Design' started by David White, Mar 25, 2012.

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  1. David White

    David White Guest

    I would like to build a circuit that will gate a 40KHz ultrasonic
    transmitter at a user-adjustable (via pot) frequency between 1 and
    10Hz.

    Power supply will be four 3.7 Li-ion batteries. Below is the part I am
    intending to use, since it will operate down to 10V.

    http://au.element14.com/multicomp/sq-40-t-10b/transmitter-ultrasonic/dp/213214

    So I know where to start, what would be the most efficient design
    approach for this project?

    So far, I am considering to modify this LM555 police siren circuit.

    http://www.circuitstoday.com/police-siren-using-ne555

    Or this:

    http://rbt-techdepot.blogspot.com.au/2011/04/modulated-38khz-ir-driver.html

    Thank you for any suggestions.Does anyone have any better suggestions?

    David White
     
  2. hamilton

    hamilton Guest

    If you going to measure distance, you should two devices.

    Like this:
    http://www.ebay.com/itm/New-Arduino...855?pt=LH_DefaultDomain_0&hash=item3a6f2f57f7
     
  3. David White

    David White Guest

    No, I am not measuring distance. Just making a transmitter.

    David White
     
  4. hamilton

    hamilton Guest

    And do you know why ??
     
  5. David White

    David White Guest

    On Mon, 26 Mar 2012 11:39:43 -0700 (PDT),
    Thanks Fred. Even I should be able to modify that according to what I
    want.

    In case anyone hasn't seen it, here is a nice page with LM555 design
    applets.

    http://home.cogeco.ca/~rpaisley4/LM555.html#3

    David White
     
  6. Joerg

    Joerg Guest

    I have a Sonin Multi-Measure that also (normally) works with just one
    device. It bounces sound off of the wall or other structure to which you
    want to measure the distance. Works quite well.

    http://sonin.com/sonin-multi-measure-combo-pro

    If there is no reflective surface at the other end such as if you want
    to measure foundation digging dimensions before anything is built or
    when the distance is very large then you'd need a 2nd echo device.
     
  7. Joerg

    Joerg Guest

    Behind the building at one of my clients you would most definitely
    prefer the ultrasound method. There's some gators out there.
     
  8. Joerg

    Joerg Guest

    The manual says 3-3/4 inches at 60ft.
     
  9. Joerg

    Joerg Guest

    You can't measure the actual casing for the foundation with that. But
    for trenching it's usually ok.

    When I laid carpet tiles a couple months ago I did it for kicks.
    Measured the first tile marker line with the Sonin, switched to metric
    because I use a German "Zollstock" with centimeters to cut tile. Said
    284cm from there to the wall. Took the Centimeter measure ... 283.6cm.
     
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