Newsgroups: comp.robotics
Path: brunix!sgiblab!swrinde!cs.utexas.edu!usc!elroy.jpl.nasa.gov!ames!pacbell.com!amdahl!netcomsv!netcom.com!nstn
From: nstn@netcom.com (Nathan Stratton)
Subject: Re: Ultrasonic Range Finder
Message-ID: <nstnCox4qL.JM3@netcom.com>
Organization: Netcom Online Communications Services (408-241-9760 login: guest)
References: <2p8mnr$cdc@clarknet.clark.net> <Cov4uy.JJu@cs.vu.nl> <2pjf9v$a4a@clarknet.clark.net>
Date: Wed, 27 Apr 1994 12:44:44 GMT
Lines: 41

In article <2pjf9v$a4a@clarknet.clark.net> gregpres@clark.net (g.Preston) writes:
>Ellert van Koperen (ekoperen@cs.vu.nl) said, and I quote:
>: g.Preston (gregpres@clark.net) wrote:
>
>: :   I believe the Polaroid pings on 
>: : 3 different frequencies with each sampling.
>
>: : 	-Greg-
>
>: What kind of speaker/microphone does one use for this?
>
>
>: Greetz, Ellert.
>
>
>	It has been a long time since I sourced these "Polaroid" type 
>sonar systems, but I just saw an article in "Computer Applications 
>Journal" that uses this sonar setup.  They used to cost about $70 u.s. 
>but they include the transducer and control electronics (transmitter and 
>receiver).  I'm pretty sure you can get a copy of the above mentioned 
>magazine in the nl.  It's the latest issue.  Can anyone else recommend a 
>source for these devices?
>
>	-Greg-
>
>P.S. The aforementioned issue of Circuit Cellar INK: computer 
>Applications Journal is devoted to robotics and has an interesting 
>article on building a laser diode ranging device with no moving parts. 
>Uses a 256 pixel ccd as a detector and where the reflected beam of light 
>strikes the ccd gives an angle to determine distance!  Cool.

Polaroid trandusers are $25 in qut of 10 and the ranging boards are $25 
in qt of 10 also. 



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 | Nathan Stratton              Washington and Lee High School Junior        | 
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