Subject:
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Re: Ultrasonic Sensor iS "Slow"
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Newsgroups:
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lugnet.robotics.nxt
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Date:
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Tue, 11 Sep 2007 04:17:39 GMT
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Viewed:
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22632 times
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> > John Hansen wrote on September 05, 2007 3:40 PM
> >
> > The errors that occur are that the sensor does not properly report
> > variable distances as it is positioned at varying distances from an
> > obstacle. If you slow down the read rate then it works correctly
> > (i.e., with a wait of ~15 ms between read transactions) but without
> > that delay it does not accurately reflect the varying distances as
> > it should. I'm not talking about getting bus errors - just invalid
> > distance readings from the sensor.
>
> You're right!! If you poll the sensor too fast, it definitely reports
> wrong distances. I'm doing some more testing to characterize the error
> performance.
The 15 ms that John reported is the time it takes for a sound pulse to travel
500 mm, the round trip distance at the maximum advertised range of the US
sensor.
An interesting coincidence?
Roger Glassey
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Message is in Reply To:
 | | Ultrasonic Sensor iS "Slow"
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| Original Thread title was "Re: Ooops! NXT Software Comparison correction / I2C Messaging Speed". I've renamed as worth a separate thread. (...) You're right!! If you poll the sensor too fast, it definitely reports wrong distances. I'm doing some (...) (17 years ago, 7-Sep-07, to lugnet.robotics.nxt)
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