Newsgroups: comp.robotics
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From: sseaton@iise.csiro.au (Scott Seaton)
Subject: High Speed Tone Detection (was Re: ROBOT BOOKS)
Message-ID: <D3z4MK.Lzo@syd.dms.CSIRO.AU>
Followup-To: comp.robotics
Summary: better sonar
Sender: news@syd.dms.CSIRO.AU
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Reply-To: sseaton@iise.csiro.au
Organization: CSIRO Institute of Information Science & Engineering
References: <3gvh6v$4qk@handler.Eng.Sun.COM>
Date: Tue, 14 Feb 1995 05:01:32 GMT
Lines: 41

In article <3gvh6v$4qk@handler.Eng.Sun.COM>, cmcmanis@Sun.COM (Chuck McManis) writes:
> Jean-Michel Friedt (jmfriedt@ens-lyon.fr) wrote:
> : I built the ultrasonic transducer given at the end of the book and it 
> : doesn't seem to work properly. I've tried two times with two different 
> : sets of componenents. Is there a mistake there or am I completely 
> : stupid and unable to build an electonic circuit ?
> 
> 
snip snip
>
> The final result was an echo ranging circuit that was accurate to about
> 4". The inaccuracy was primarily due to the random amount of time it took
> the 567 to "lock on" to the echo and indicate it. 
> 
> --
> --Chuck McManis			     All opinions in this message/article are
> Sun Microsystems Inc.                those of the author, who may or may not
> Internet: cmcmanis@Eng.sun.COM       be who you think it is.
> Crypto-puzzle: *0U0JPFPrWRN9PkWRKeP5WRmIR9wP5QAWuIQP9Pu9tnIZ7AD1SIS

Is there an alternative to the 567 tone detector ? I'm interested in building
this (the Robot Builder Bonanza sonar project), but I'd like to know if there's
a better way to detect the echo....

Does anyone know much about an old CMOS part (4066 ?), it's a PLL. Could a PLL
be used for this application ? What about using a processor ? The 6.270 code
includes rudimentary PLL code, could a miniboard be setup to run the sonar and
send results back to a 68HC11 running in expanded mode via the high speed synch
comms port ? Or could a PIC handle this ?

Thanks
Scott
 _________________________Scott Seaton, CSIRO IISE,_______________________
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