Subject:
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Re: detecting goal objects at a distance
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 31 Dec 1999 07:51:51 GMT
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Viewed:
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1246 times
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Ben Jackson <ben@ben.com> wrote in message news:FnJpCI.JGo@lugnet.com...
> I want to make a robot that finds a small object, picks it up, and carries • it
> somewhere. I don't want to have to tell the robot how to find it (eg with • a
> line on the floor), and I'd prefer to avoid randomly (or even • systematically)
> searching the entire floor hoping to just run into the target.
>
> The builtin light sensor seems to be useless at a distance. Even in a • darkened
> room with the target illuminated by a laser pointer the sensor values • barely
> fluctuate when it is pointing at the target. I've tried covering the • target in
> aluminum foil... I'm willing to put a beacon (like a battery powered LED) • on
> each target (I'm using empty film canisters) but even then I can't seem to • make
> a dent in the sensor readings. Should I buy an IR LED?
>
> Has anyone tried putting a lens in front of the sensor? SONAR? RADAR?
Consider blocking the light emitter on the sensor, either completely or
partially
(the side of the emitter facing the sensor) to reduce the saturation of the
sensor
by the emitter, then use the IR sender on the RCX to emit pulses of IR and
follow
the high values from the sensor, they'll be from things reflecting the IR.
If you have
the luxury of putting an emitter on the objects themselves, even better.
Or, perhaps,
put a laser pointer on the robot, pointing out over the sensor.
Sounds like fun!
-Peter
--
Peter A. Vogel
Release Engineering Manager
iReady Corporation
http://www.iready.com http://www.iready.net
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Message has 1 Reply:
 | | Re: detecting goal objects at a distance
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| (...) I've read this tip several times. I experimented with it last night, and the difference between blocking and not blocking the sensor was minimal. My light sensor must not bleed much light directly across. Perhaps I'm doing something wrong? Re: (...) (25 years ago, 1-Jan-00, to lugnet.robotics)
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Message is in Reply To:
| | detecting goal objects at a distance
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| I want to make a robot that finds a small object, picks it up, and carries it somewhere. I don't want to have to tell the robot how to find it (eg with a line on the floor), and I'd prefer to avoid randomly (or even systematically) searching the (...) (25 years ago, 30-Dec-99, to lugnet.robotics)
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