Subject:
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IR Ball (was Soccer-Playing Robots)
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Newsgroups:
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lugnet.robotics
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Date:
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Fri, 1 Sep 2000 13:54:07 GMT
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Original-From:
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Wilcox, Doug <Doug.Wilcox@iMcKesson.com(stopspam)>
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Viewed:
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661 times
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The Lego light sensors are particularly sensitive to infra-red (one of those
gems of information that I've picked up from the robotic mailing list), so
the standard Lego light sensors can be used to "see" a ball that's throwing
off lots of IR, like the one Marco and Mario and Giulio built.
I need a schematic (or--in reality--at least a resistor value, whether the
LEDs are parallel or in series, and the battery voltage used) to wire the
LEDs without burning them out, but my biggest challenge will be finding a
clear plastic ball of the right size. :)
Now that I'm thinking about it ... I do have more questions.
Are 28 LEDs really necessary?
Was the range 2 meters? (I could live with 1 meter)
What was the effect of ambient light?
Where did that cool plastic ball come from?
Thanks!
Doug Wilcox
Senior Web Developer
iMcKesson Provider Solutions Group-Needham
160 Gould Street, Suite 130
Needham, MA 02494-2308
Phone: 781.453.2900 x 237
Fax: 781.455.7990
e-mail: Doug.Wilcox@iMcKesson.com
http://www.imckesson.com
"You see, I had this space suit. How it happened was like this ..."
(Opening lines from Robert A. Heinlein's Have Space Suit-Will Travel)
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Message has 5 Replies:
 | | Re: IR Ball (was Soccer-Playing Robots)
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| (...) Wander into any toy store and you'll find small figures (Pokemon's etc) packed into plastic spheres that split conveniently around the equator. You should have no problem finding one of an appropriate size there were LOTS to choose from at our (...) (24 years ago, 1-Sep-00, to lugnet.robotics)
| | | Re: IR Ball (was Soccer-Playing Robots)
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| >That wouldn't look as great as a free rolling ball - and the >robots would perhaps have trouble finding it while it's in >motion....but 28 LEDs is a heck of a lot! Seems like a lot to me. The wider angle IR LEDs have a 60 degree cone. I think you (...) (24 years ago, 1-Sep-00, to lugnet.robotics)
| | | Re: IR Ball (was Soccer-Playing Robots)
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| (...) Just wanted to share some other informations that are currently being discussed by email: I used a Philips IR LED intended to be used for TV remote control, it works well with 1-1,2 V and in this range absorbs about 8-10 mAh. I used a battery (...) (24 years ago, 1-Sep-00, to lugnet.robotics)
| | | Re: IR Ball (was Soccer-Playing Robots)
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| Wilcox, Doug writes: > I need a schematic (or--in reality--at least a resistor value, whether the > LEDs are parallel or in series, and the battery voltage used) to wire the > LEDs without burning them out, but my biggest challenge will be finding a (...) (24 years ago, 1-Sep-00, to lugnet.robotics)
| | | Re: IR Ball (was Soccer-Playing Robots)
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| (...) I tried to build something like this. I was just trying to make a film canister into a beacon (even if the LEDs had to be external). I was using high-output IR LEDs powered by small lithium watch/camera batteries. What I discovered was that no (...) (24 years ago, 7-Sep-00, to lugnet.robotics)
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