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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Thu, 30 Dec 1999 15:48:03 GMT
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Viewed:
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723 times
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Ben Jackson <ben@ben.com> wrote:
> 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?
This is a thing I'm interested in too. Those of you who were at the mindfest
might remember the soccer playing robots. The bots were really simple but
performed impressively. The main trick was that the ball was actually
emitting IR (thru' LEDS) and the bots used standard light sensors to
localize it.
Does any of you have suggestion on what kind of IR led is more appropriate
to make such an object? Do I need any additional circuit, or just a LED and
a battery (and the proper resistor) are enough?
Thanks
Mario
Web page: http://www.geocities.com/~marioferrari
LUGNET member page: http://www.lugnet.com/people/members/?m=22
Proud member of ItLUG: http://www.itlug.org
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Message has 1 Reply:
 | | Re: detecting goal objects at a distance
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| (...) I imagine that - even if using such an IR LED as a beacon - roomlight etc. will still be the major problem. So, I'm pretty sure that a quite simple means at the detector side would simplify such a project dramatically: an optical IR filter. (...) (24 years ago, 31-Dec-99, 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 (...) (24 years ago, 30-Dec-99, to lugnet.robotics)
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