Twinling LEDs?
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Posted by on October 28, 2005, 3:00 pm
Please log in for more thread options There was a recent artlce in Nuts & Volts magazine for controlling a set of LED to flicker like a candel for Halloween....used a microcontroller to randomize the process. October 2005 Issue STAMP APPLICATIONS Tricks and Treats With LEDs http://www.nutsvolts.com/toc_Pages/oct05toc.htm http://www.nutsvolts.com/toc_Pages/images/0510/14sm.jpg On 28 Oct 2005 06:41:10 -0700, key130@hotmail.com wrote: | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Posted by Spehro Pefhany on October 28, 2005, 11:08 pm
Please log in for more thread options On Fri, 28 Oct 2005 15:00:40 GMT, the renowned AntiSPAM_g9u5dd43@yahoo.com wrote: >There was a recent artlce in Nuts & Volts magazine for controlling a
>set of LED to flicker like a candel for Halloween....used a >microcontroller to randomize the process. You can buy a twinkling LED (electronic tea light) with LR44 batteries at Michaels for a few dollars. Probably uses a tiny COB ASIC. Best regards, Spehro Pefhany -- "it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Posted by on October 29, 2005, 8:41 am
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Wow!. Thanks for the useful replies - an active newsgroup! Need to do some research on PN Sequence as I have no idea what that is. I'm not going to use a microcontroller at this stage as it's way beyond what I want to learn, but maybe for the future. And to define twinkling - the usual effect of a light being bright then less bright and varying inbetween. Regards, Al. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Posted by Fred Bloggs on October 29, 2005, 9:26 pm
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>
> Need to do some research on PN Sequence as I have no idea what that is. > I'm not going to use a microcontroller at this stage as it's way beyond > what I want to learn, but maybe for the future. > And to define twinkling - the usual effect of a light being bright then > less bright and varying inbetween. > As you might expect from the word, digital, most circuits turn the LEDs on and off, this is not a varying brightness. To vary the brightness, the LEDs would have to be PWM'ed, and since star scintillation is usually independent, you will need 100 PWM'ers. The LEDs cannot be time shared with a single PWM because that would restrict the PWM control to only 1/100th the revisit time. If you break the LEDs down into say 8 groups of 12, total 96, and position the LEDs from a single group evenly among the LEDs from the other groups, then this should be effect enough when you modulate the brightness of the groups independently with 8 PWM'ers. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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>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.