Subject:
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RE: Home-made Light Bricks
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 27 Jan 2000 20:06:38 GMT
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Original-From:
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Tilman Sporkert <{tilman@activesw.}spamcake{com}>
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Viewed:
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893 times
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The big advantage of using LEDs is that you can control two lights from a single
RCX output. As long as you don't want them to light at the same time. They also
use less power than light bulbs. Now what we really need is a de-multiplexer, to
drive multiple LEDs from a single output.
LEDs work quite well with pulse power. If pulsed, the current during the on
period can exceed the current rating of the LED. So instead of simply turning on
the LED, you can generate a series of bright flashes. That's how your digital
clock with LED display works - the different segments of the digits are actually
never on at the same time. Each segment just flashes very brightly for a short
time. Your eyes are too slow to notice that, and it appears as if the LED is on
constantly.
Tilman
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Message has 1 Reply:
 | | Re: Home-made Light Bricks
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| To prove this, stick a fan in front of a digital clock... watch through the fan blades as you turn it on and as it slows to a stop... the fan will act as a strobe light and you will see which segments actually are on at the same time... pretty neat (...) (24 years ago, 27-Jan-00, to lugnet.robotics)
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Message is in Reply To:
| | Re: Home-made Light Bricks
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| Hi Tom, I started a thread about this subject on november 12 last year. I got a lot of useful responses from people who had experience with LEDs. Not only about the resistors to use (I figured that one out for myself), but also about mounting the (...) (24 years ago, 27-Jan-00, to lugnet.dear-lego, lugnet.robotics)
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