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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 LEDs and connecting them to other Lego electric stuff.
You can still view this thread if you search the lugnet.robotics news
archive at www.lugnet.com. Exact title of the tread was "Homemade LED
Bricks".
BTW, lowering the output on the RCX will make the power come out in pulses.
These pulses will still be around 8 volts and the current will rise
accordingly. You might still blow up the LED. Then again, at a few cents
apiece, who cares. Unless you've mounted it in a brick and glued it shut.
:-(
Enjoy!
Arjen
"Tom Covo" <aximili11@hotmail.com> wrote in message
news:FoyutH.G3n@lugnet.com...
> Hi all,
>
> I would just like to pose a new idea. Current light bricks have lights, • and
> different caps to provide different colors. What I am experimenting with • now
> is the use of Light Emmiting Diodes(LEDs).
> LEDs will only light up if the current is travelling in the right
> direction (polarity). So what I did was connect two LEDs, one green and • one
> red, in different directions. What happens is this:
> The green LED lights up if one button is pressed, and the red one • lights
> up if the other one is pressed.
> But be careful if you are using the 9-volt power pack. you must use a
> resistor if you don't want to blow your LEDs. If you are using mindstorms,
> you could probably just lower the power level for that output.
> I think this would be interesting to use in a robot as an indicator of
> some sort. I hope to get some pictures online of what I've got so far, but • I
> don't know who to borrow a digital camera from.
>
> Tom
>
> PS LEDs at Radio Shack are not very expensive, and ask about resistors.
>
>
>
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Message has 1 Reply:
 | | RE: Home-made Light Bricks
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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 (...) (24 years ago, 27-Jan-00, to lugnet.robotics)
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Message is in Reply To:
| | Home-made Light Bricks
|
| Hi all, I would just like to pose a new idea. Current light bricks have lights, and different caps to provide different colors. What I am experimenting with now is the use of Light Emmiting Diodes(LEDs). LEDs will only light up if the current is (...) (24 years ago, 26-Jan-00, to lugnet.dear-lego, lugnet.robotics)
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