Subject:
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Re: 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 20:20:28 GMT
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Viewed:
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593 times
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"Wilcox, Doug" wrote:
>
> Are 28 LEDs really necessary?
> What was the effect of ambient light?
> Where did that cool plastic ball come from?
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 pack made with four Sanyo 350 AAC NiCd that gives about 4,8 V
when fully charged. The 28 IR LED wher divided in 7 banks of four led (
7 times joined in parallel groups of 4 led in series) and I added two
banks of 3 high bright (visible) red led. Sorry I have no catalog
numbers for the LED as I bought them at a fair of surpluss electronic
equipment :)
The number of leds, the range and the ambient light are strictly related
togheter:
bigger range > more IR power needed
higher ambient light > more IR power needed
The plastic ball comes from a street toys dispenser for children:
something you may find in Italy outside of many shops, you insert the
equivalent of 1$ in coins and you will get a transparent plastic ball
with a very cheap and stupid toy inside.
Marco & Giulio
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Message is in Reply To:
 | | IR Ball (was Soccer-Playing Robots)
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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 (...) (24 years ago, 1-Sep-00, to lugnet.robotics)
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