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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Fri, 19 May 2006 22:41:46 GMT
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Viewed:
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2484 times
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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
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Message has 2 Replies:
 | | Re: Ultrasonic sensor interactions
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| (...) 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 (18 years ago, 20-May-06, to lugnet.robotics)
| | | Re: Ultrasonic sensor interactions
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| (...) A better alternative would be to develop protocols in which the NXT controllers use their communications to tell each other what they are about to do. If you can sent a message that says "I'm about to do an ultrasound 'ping' - so you'd better (...) (18 years ago, 20-May-06, to lugnet.robotics)
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Message is in Reply To:
| | Ultrasonic sensor interactions
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| 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? -Tim (18 years ago, 19-May-06, to lugnet.robotics)
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