From: "Frank Bemelman"
Subject: Re: Flickering Candlelight Effect??
Date: Wed, 1 Jan 2003 21:41:04 +0100
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Organization: EuroNet Internet
NNTP-Posting-Date: 01 Jan 2003 20:41:53 GMT
"Jim Thompson" schreef in bericht
> 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 have 12VAC available outdoors (yard light system).
A year ago there was a thread about a nightlight, that should slowly
change color. A PIC solution was suggested, and I wrote some code
to emulate 3 independent pwm outputs. The modulation is table driven.
I suppose if you use 3 lamps, each modulated at 0.5Hz, 1Hz and 1.5Hz, it
may look like a candle. With 3 lamps, even when placed tight to each
other, the center of the light also move a bit.
OTH, if you mix a few low frequencies, to get some randomness, and use
that to modulate 1 lamp, and use the inverted signal to modulate a
second lamp, you would get a more or less constant output light,
and having the center also move a bit.
You can also get neon 'candle' lamps. You could use a small transformer
to increase your 12VAC. Unfortunately, these lamps give very little light.
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