Subject:
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Re: sonar
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Mon, 18 Nov 1996 01:13:10 GMT
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Original-From:
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David Negro <DLN2@CORNELL.EDUantispam>
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Viewed:
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1252 times
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> So...someone correct me if I'm wrong...the Digikey things are missing the
> > driving circuitry. As an analogy to the Polariods, you only get the
> "speaker" >and "microphone" part. Thus you have to build this yourself
> which will cost >some $.
No, you are correct. The sonar parts that Digikey and All Electronics and
others offer are just the sensor and transducer. Polaroid seems to make a
package with all ranging electronics included. I read an article (by Chuck
McManis if memory serves) in the robotics issue of Circuit Cellar ink (Oct
95, I think) that describes how to make your own sonar range module.
However, I think that he mentions that it is more worth people's time,
effort and money if you just get the Polaroid module.
Basic idea behind Sonar is this: Send a pulse with the transducer. The
sound pulse travels across the room, hits an object, and reflects back (and
everywhere else). The time that it between when you sent the pulse and
when you recieved a return pulse is twice the time that it takes sound to
travel to the nearest object in the line of the pulse.
Hope that helps,
-Dave Negro
dln2@cornell.edu
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Message is in Reply To:
 | | sonar
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| I was paging through the digikey catalog and found some pairs of ultrasonic transducers and recievers for about $12 a pair. Does anyone know where I can get information regarding setting these up for sonar, either from their own experience or (...) (28 years ago, 17-Nov-96, to lugnet.robotics.handyboard)
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