Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!sun-barr!apple!well!nagle
From: nagle@well.UUCP (John Nagle)
Newsgroups: sci.electronics
Subject: Re: Ultrasonic distance finder
Message-ID: <14056@well.UUCP>
Date: 12 Oct 89 05:39:29 GMT
References: <2900UD130322@NDSUVM1>
Reply-To: nagle@well.UUCP (John Nagle)
Lines: 27

In article <2900UD130322@NDSUVM1> UD130322@NDSUVM1.BITNET writes:
>
>  I am thinking of building an ultrasonic distance measuring device for
>an electronics project.
>
>  A few questions come to mind when thinking about building one of these.
>I am assuming these work in the ultrasonic range. Is this correct?

       Yes.

>Can the transmitter also be used to receive the reflected signal?

       Yes.

>Are there any chips available that would greatly simplify the construction?

       Yes.  Check out the Texas Instruments SN28827 Sonar Ranging Module,
which uses the TL851 and TL852 special-purpose ICs.  This is old technology,
circa 1983, and drives Polaroid electrostatic transducers.  There's an
experimenter's kit for Polaroid sonar ranging devices from Polaroid, as
well.  The TI unit is more useful if you have computer interfacing in 
mind, although the output is just a level and you have to do the timing
externally.

       If you get information on more modern parts, please post.

					John Nagle