> I'm in need of the URL for an article I found on using the 16F84 and
> muRata ultrasonic receivers and transmitters.  The articles title is
> "Paul's Cheap Sonar Range Finder Design."

This is my SONAR reference list so far:

http://www.seattlerobotics.org/encoder/may97/sonar2.html
        TI/Polaroid design - nice discussion of how SONAR works.

http://pw1.netcom.com/~t-rex/BatDetector.html
        Cool Bat detector!

ftp://ftp.parallaxinc.com/pub/acrobat/stamp1_manual_v1.8.pdf
        Basic Stamp app note - includes a SONAR circuit.

http://www.people.cornell.edu/pages/shb7/ranger.html
        Nice SONAR using bits off the PC parallel port.

http://www.hamjudo.com/sonar/
        Serial SONAR with very few parts.

http://www.mindspring.com/~sholmes/robotics/ultrasnd.htm
        The most elaborate circuit so far.

http://www.allcorp.com/BUZZER04.html
        This is a source of CHEAP ($2.50) transducers.


--
Daniel Poirot           dan.t.poirot1@jsc.nasa.gov