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Slash Tantrum
02-23-2005, 04:53 AM
Hi, I got a SRF08 recently and was wondering how to connect it to my Basic Stamp 2 properly. I read the nuts and volts article about it, but upon connecting everything, exactly as shown, It didnt work... at all. I haven't found any other useful information anywhere else either.

Post Edited (Slash Tantrum) : 2/22/2005 9:46:43 PM GMT

Beau Schwabe
02-23-2005, 05:11 AM
When I did a Google search for "SRF08" I found tons of information.


you said...
I haven't found any other useful information anywhere else either


...Perhaps you did a search for "(No Subject) (http://forums.parallax.com/showthread.php?p=525994)" resulting
in your not so useful findings.

http://www.robot-electronics.co.uk/htm/srf08stamp.shtml
http://www.acroname.com/robotics/info/examples/srf04-1/srf04-1.html
http://www.superdroidrobots.com/product_info/SRF08.htm
http://www.totalrobots.com/examples/example43.htm

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Beau Schwabe - Mask Designer III

National Semiconductor Corporation
(Communication Interface Division)
500 Pinnacle Court, Suite 525
Mail Stop GA1
Norcross,GA 30071
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Post Edited (Beau Schwabe) : 2/22/2005 9:21:25 PM GMT

Slash Tantrum
02-23-2005, 05:51 AM
Hah! I forgot to put in a subject! I've looked at most of those and haven't found them very helpful. I'll look at the one that I haven't though. Basicly what I meant by the question was: Does anyone know of a configuration that definately works? Like one they have tried or seen used?

Beau Schwabe
02-23-2005, 06:17 AM
I'm not sure if this approach would work for you, but years ago I setup a test configuration where
the ultrasonic transmitter was sending a constant 40kHz.... i.e. There was no 'PING'


On the receiver test side I connected a scope, and visually I was able to process what I was seeing
on the scope based on where I was pointing the transmitter under various scenarios.

The point of this was a very useful exercise/learning curve that allowed me to understand exactly
what needed to be tackled in the way of a design goal.



BTW) With this setup I designed an adjustable 40kHz oscillator where I could adjust within +/- 20%
of 40kHz. Reason I mention this, is because you can optimize the resonate frequency of the
transmitter/receiver to see a DRAMATIC increase in performance by an order of magnitude.




Another helpful ultrasonic "test" device that is nice to have is an audible divide by 4 or 5 to bring down the
40kHz into a "human" audible range..... What you hear may surprise you!

To elaborate, I was working late one summer night and thought my 40kHz transmitter was malfunctioning.
So I turned it off completely.... I Still heard a strange "random" noise in my receiver that altered as I
moved about.. Being that my receiver was portable, I was able to target the source... INSECTS!!!
I found what appeared to be a bluish-gray beetle (looked like a stink bug) composing a rather interesting
45kHz song.

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------------------------------------------------------------------------------------
Beau Schwabe - Mask Designer III

National Semiconductor Corporation
(Communication Interface Division)
500 Pinnacle Court, Suite 525
Mail Stop GA1
Norcross,GA 30071
-------------------------------------------------------------------------------------

Post Edited (Beau Schwabe) : 2/23/2005 6:14:11 AM GMT

tehmoordar
02-26-2005, 01:43 AM
I have recently worked on sonar SRF08 and I followed the steps n NUTS and bolts and mine is working fine where you are stuck