Twinling LEDs?
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Posted by on October 28, 2005, 6:41 am
Please log in for more thread options Hi. I got a bunch (around 100) of white LEDs. I'd like to build a small disc with twinkling LEDs. How would I do this? I've hunted around the forums and found references to using 555 timers. However, I would imagine that to cut down on the number of 555s I'd have to drive a number of LEDs off of each one, thus loosing the randomness that I'm looking for. I'm good at following circuit diagrams provided everything is labelled but suck at understanding behind some of the more complex workings! (I didn't always pay attention in electronics class) Are there any websites with circuits depiciting what I want? Thanks, Al. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Posted by on October 28, 2005, 6:51 am
Please log in for more thread options key130@hotmail.com wrote: There's a 556 dual 555, and I think even a quad version (557?) There were also some special LED flasher chips simpler than the 555. Some of the self-flashing LED's could handle a few additional LED's in series. Other ideas might be a random number generator chip, or some kind of simple ring or ripple counter driving a small rom chip. Smallest physical solution is probably to get a bunch of small microncontrollers (PIC, basic stamp, etc) and use each one to drive as many unique signals as possible. That could be an interesting learning experience. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Posted by Dirk Bruere at Neopax on October 28, 2005, 4:55 pm
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cs_posting@hotmail.com wrote: > key130@hotmail.com wrote:
> > >>I've hunted around the forums and found references to using 555 timers.
>>However, I would imagine that to cut down on the number of 555s I'd >>have to drive a number of LEDs off of each one, thus loosing the >>randomness that I'm looking for. >
What's wrong with just a whole lot of self flashing LEDs?
> > There's a 556 dual 555, and I think even a quad version (557?) > > There were also some special LED flasher chips simpler than the 555. > > Some of the self-flashing LED's could handle a few additional LED's in > series. > > Other ideas might be a random number generator chip, or some kind of > simple ring or ripple counter driving a small rom chip. > > Smallest physical solution is probably to get a bunch of small > microncontrollers (PIC, basic stamp, etc) and use each one to drive as > many unique signals as possible. That could be an interesting learning > experience. > They won't stay in sync long after powerup. -- Dirk The Consensus:- The political party for the new millenium http://www.theconsensus.org | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Posted by Ken Smith on October 30, 2005, 6:50 pm
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[...] >What's wrong with just a whole lot of self flashing LEDs?
>They won't stay in sync long after powerup. Make sure you bypass the supply or the silly things may stay in sync. -- -- kensmith@rahul.net forging knowledge | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Posted by Rich, Under the Affluence on October 31, 2005, 11:06 pm
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On Sun, 30 Oct 2005 18:50:19 +0000, Ken Smith wrote: > [...]
>>What's wrong with just a whole lot of self flashing LEDs?
>>They won't stay in sync long after powerup. >
> Make sure you bypass the supply or the silly things may stay in sync. > Speaking of that, what's in a flashing LED anyway? Thanks, Rich | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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> However, I would imagine that to cut down on the number of 555s I'd
> have to drive a number of LEDs off of each one, thus loosing the
> randomness that I'm looking for.