Flicker algorithm help

to build a camp-fire

practicals. The control box

opto-isolated solid state

slaves can be connected to

a camp-fire, or will a

Circuit Cellar had a project 2 or 3 years ago IIRC for handheld candles on stage. I don't have a link but the article did talk about how to make the flicker convincing. You would probably want the same algorithm for a camp fire.

Bob

On 18/01/2006 the venerable Bob etched in runes:

Thanks Bob. I'll have a look at their archive.

... snip ...

Dunno, but I believe the old fashioned method was to have a small motor rotate a crumpled mica tube over a light bulb. Used in artificial fireplaces and the ilk.

me

of

of

on

the

camp

this might help, too:

several versions of a candle. One is the CC piece I was thinking of (Oct

I've seen modern implementations that use a shredded nylon cloth, blown upwards by a small fan, lit from beneath by a small colored lightbulb. Surprisingly effective.

Regards, -=Dave

On 18/01/2006 the venerable Bob etched in runes:

. .

Hi Bob. I couldn't find the article on Circuit Cellar but I have just subscribed to the electronic edition!! That website is just what I need. Thanks.

Nuts & Volts had a project on this for last October's issue. The article itself isn't online but there is a link to the example source code. Back issues are for sale, though, natch.

On 19/01/2006 the venerable Rich Webb etched in runes:

. . .

Thanks Rich. I've got the code, but haven't looked at it yet. I suppose I'll have to translate from BASIC to C. Hmmm, could be worse ;-)

Here's an article with some info on simulating candle flicker.

The basic answer is a pseudo-random sequence with a 1-pole low pass filter at some lowish frequency.

That URL's from my bookmarks, but I think I found it by looking through some of the same websites people are mentioning elsewhere in this thread :-)

On 22/01/2006 the venerable Wim Lewis etched in runes:

Thanks Wim. That looks really useful. Code is in C too so conversion to AVR should be a breeze.