Subject:
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Re: Sonar and the handyboard
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Newsgroups:
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lugnet.robotics.handyboard
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Date:
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Thu, 20 Mar 1997 18:25:11 GMT
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Original-From:
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Tom Brusehaver <{tomb@}antispam{netperceptions.com}>
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Viewed:
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1660 times
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> Since 8" is the 'minimum' distance the board can see, I strongly
> suspect that your transducer isn't sufficiently damped. This will
> cause it to continue 'ringing' after the pulse is sent and when
> the receiver switches on, its still vibrating so it sees that as
> an echo. How is the transducer mounted?
The one that is mounted is in a plastic box, glued in with silicon
glue. The unmounted one was laying on my bench pointed at the
ceiling.
> Another possibility is that you are pulling 'blank inhibit' low
> for some reason (you have to do this if you want to read closer
> than the default for the board and so you never get the 'rest'
> period where the transducer is settling down.
I assume the 'blank inhibit' pin is BINH (docs are at home, I am at
work), and that is connected to motor 3 line (U11 pin 1?). That does
go high and low along with INIT, using Kents software.
I think this is the right track though.
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Message is in Reply To:
 | | Re: Sonar and the handyboard
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| (...) Since 8" is the 'minimum' distance the board can see, I strongly suspect that your transducer isn't sufficiently damped. This will cause it to continue 'ringing' after the pulse is sent and when the receiver switches on, its still vibrating so (...) (28 years ago, 20-Mar-97, to lugnet.robotics.handyboard)
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