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Gated Ultrasonic Transmitter

D

David White

Jan 1, 1970
0
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
 
H

hamilton

Jan 1, 1970
0
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

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
 
D

David White

Jan 1, 1970
0
If you going to measure distance, you should two devices.

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

David White
 
D

David White

Jan 1, 1970
0
On Mon, 26 Mar 2012 11:39:43 -0700 (PDT),
This one should do the job, just include a current limiting resistor in series with the transducer as shown in the example circuit in their data sheet.

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
 
J

Joerg

Jan 1, 1970
0
hamilton said:
And do you know why ??

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.
 
J

Joerg

Jan 1, 1970
0
Jim said:
I'd use a tape measure ;-)

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

Joerg

Jan 1, 1970
0
Jim said:
At what temperature range? If you want your footer built with that
kind of accuracy, go ahead. We'll measure the south line today, but
wait until tomorrow to do the north line because there's a cold front
coming thru and it's going to rain :)

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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