Path: utzoo!attcan!uunet!decwrl!sdd.hp.com!zaphod.mps.ohio-state.edu!pacific.mps.ohio-state.edu!tut.cis.ohio-state.edu!pt.cs.cmu.edu!andrew.cmu.edu!fk06+
From: fk06+@andrew.cmu.edu (Frank Vincent Koss)
Newsgroups: sci.electronics
Subject: Summary: Sensor circuits
Message-ID: <EahiUmi00WB3M39GcW@andrew.cmu.edu>
Date: 1 Aug 90 14:33:22 GMT
Organization: Class of '91, Carnegie Mellon, Pittsburgh, PA
Lines: 23

Here is a summary of what I found out:

From V105L4LG@ubvmsc.cc.buffalo.edu:
                I got some ultrasonic tranducers to buy at a small electronics
place out in Nassau county/Levitt town,the business place is called Edlie
electronics check out the phone book. Sorry no # I don't have much with me here,check out the phone book he is listed.        Price around $15.per

From George P Cotsonas <geopi@hocpa.att.com>:
About 8 years ago, Polaroid had these little ultrasonic modules,
which could be had in the form of evaluation boards (~$200), which basically
measured the time delay of ultrasonic pulses returned from the environment;
intent was autofocus cameras.

I see digital tape measures in the hardware store bargain bin these days,
which use the same technology at only about $19.

Thanks for the replies.  I've also found that DigiKey has ultrasonic sensors
from Murata Erie North America (DigiKey: 1 (800) 344-4538)

Frank Koss
fk06@andrew.cmu.edu
    or
koss@cs.cmu.edu