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From: "Da Man"
Subject: Re: Flickering Candlelight Effect??
X-Newsreader: Microsoft Outlook Express 5.50.4807.1700
Date: Fri, 03 Jan 2003 08:11:38 GMT
NNTP-Posting-Date: Fri, 03 Jan 2003 04:11:38 AST
"Spehro Pefhany" wrote in message
> On Wed, 01 Jan 2003 19:45:11 GMT, the renowned Jim Thompson
> >I seem to recall a thread about simulating a flickering candle. At
> >the time I had no interest.
> >Now we've been given a very nice set of steel Christmas carolers about
> >3' high, each caroler holding a music book and a candle holder.
> >Candles would never stay lit in the breezy Arizona December, so I'm
> >thinking of simulating a candle with LED's (or could be incandescent).
> >Any ideas?
> I played around for a few hours with a microcontroller PRNG-based
> flickering candle, but the combination of simulated motion, amplitude
> and color changes was not as convincing as I would have liked when
> compared with mechanical methods that the movie studios etc. use.
> I can burn a chip (8-pin uC) and drop it in the mail if you'd like
> to fiddle with it. Just the chip and LEDs and resistors are
> required, IIRC.
I was once working on programming a AVR, on the STK 500 development board
which uses 8 fairly bright orange LED's. I had a debug line programmed in,
that when in a certian mode it would basically just keep incrementing a
register and outputting the value of the register out the port that ran the
LED's. IE it was a 8 BIT counter with LED's on the outputs. It was running
at about 9Hz. Since it was in the living room where I was doing the
debugging, I just left it sit running for awhile. I went back a few hours
later to get something, and I noticed the reflection of a candle flickering!
Upon closer inspection, it was only the development board.
Making something like that with a few colored LED's mixed with the orange
ones might make a interesting fake candle. You could reduce the LED's by
supplying them with 2 or 3 differnt sized resistors going each going to a
differnt bit. You might even get away with 1 LED
> Best regards,
> Spehro Pefhany
> "it's the network..." "The Journey is the reward"
> firstname.lastname@example.org Info for manufacturers:
> Embedded software/hardware/analog Info for designers:
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