SNIP! SNIP!

>> - Rick
>>---
>> You can help design a Serial Sonar Unit for model robots!
>>  Vist http://www.notesguy.com/notesguy for details, or
>>   send mail to Rick Dickinson at rtd@notesguy.com

Rick,

A few years back Lawrence Livermore Labs was working on a ultra
low power pulsed radar device that would go for about $10US. I am
not however sure what happened to the device except a few companies
were using it to detect rebar and in automobile colision detection
circuits.  I am not sure where the technology lay now but it
may be useful in gleaning design specs from.

I will pull out the article and see what I can pull up in the present
that may help you.  One of these devices hooked to a PIC and serial
chip would be just as cheap as an ultrasonic unit.


John Adams  --  http://pobox.com/~electronics  --  electronics@pobox.com
Check out H.W.S Internet Guide to Electronics as well. Links on my site.