Re: Controlling Holiday Lights

[sylvan butler <ZsdbUse1+noZs_0610@xxxxxxxxxxxxxxxxxxxxx>]

On 28 Oct 2006 20:33:23 GMT, Dan Lanciani <ddl@danlan.*com> wrote:
> In article <slrnek5vme.vse.ZsdbUse1+noZs_0610@xxxxxxxxxxxxxxx>, ZsdbUse1+noZs_0610@xxxxxxxxxxxxxxxxxxxxx (sylvan butler) writes:
>| If I instead trigger at 1000/sec, that is a max of 4% error when it
>| happens at random instead of synchronized to zero crossings.  This error
>| has imperceptible effect (to my eye when using incandescent lighting).
>
> What (not synchronized to the zero crossing) triac trigger waveform
> will you synthesize to obtain an approximately 50% dim level?

I don't know up front, that is a software calibration issue related to
the lamp being controlled and visual perception.

If you meant 50% power level rather than 50% light level, then I would
synth a 50% on-time, and know that with a 4% error limit I would be
close enough.  But again, that is power, not light.

sdb

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