Subject:
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Re: Ultrasonic sensor interactions
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Newsgroups:
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lugnet.robotics
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Date:
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Sat, 20 May 2006 03:19:07 GMT
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Original-From:
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Tim Rueger <trueger@STOPSPAMyahoo.com>
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Viewed:
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2641 times
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On May 19, 2006, at 5:41 PM, John Barnes wrote:
> In lugnet.robotics, Tim Byrne wrote:
> > Can someone from the MDP comment on how multiple robots using the
> > ultrasonic
> > sensor interact. It is possible to use this sensor reliably when one
> > or more
> > other robots nearby are using theirs?
>
>
> In a word, multiple ultrasonic sensors can be a problem. This is a
> general
> problem and not specific to Lego ultrasonic sensors.
>
> Pulses emitted by "the other sensor" can arrive at just the wrong
> moment,
> creating a false range reading. Clever numerical filtering can
> eliminate this
> kind of thing under certain circumstances - for example you may be
> following
> parallel to a wall and obtaining a series of readings which should be
> all within
> a likely range. If you suddenly receive a reading which is outside the
> expected
> range, you might discard it. In otherwords, if you maintain an average
> and only
> accept readings within a certain range of that average as bona fide,
> then you
> may be able to guard against this kind of interference to a certain
> extent.
>
> JB
How feasible would it be to set up some sort of
time-sharing communications over Bluetooth to
allocate time slots when each of the robots in an
area would be allowed to use their ultrasonic
sensors?
-Tim
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Message has 2 Replies:
 | | Re: Ultrasonic sensor interactions
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| (...) Very feasible... IF you could turn the US sensor off. As near as I can determine, the US sensor, when connected, is never off: it is always emitting a series of "pings" (you can actually hear a "click" from the sensor if you are really close). (...) (18 years ago, 20-May-06, to lugnet.robotics)
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Message is in Reply To:
| | Re: Ultrasonic sensor interactions
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| (...) In a word, multiple ultrasonic sensors can be a problem. This is a general problem and not specific to Lego ultrasonic sensors. Pulses emitted by "the other sensor" can arrive at just the wrong moment, creating a false range reading. Clever (...) (18 years ago, 19-May-06, to lugnet.robotics)
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