I asked about an s-curve table for lamp dimming & Jinx wrote:
>I'm working on a dimmer and wondered like you have about
>practical dimming increments.

This sort of table must have been required before by someone.
Maybe they're all commercial designs and can't release them.
(which I completely understand BTW, I've had to do the same)

>What I thought you could do is
>use a display in conjuction with the dimming phase-changing
>process so as to compare the phase angle with the brightness
>of the bulb. I suspect this may be necessary when using a
>variety of bulbs - you might not be able to guarantee that a
>table designed for one type of bulb is applicable to another

Maybe the dimmer can have multiple (selectable) tables. Then
you could tell the dimmer which channels to use which table.
Hmm... that sounds like a good idea actually. I started with a
straight linear relationship but the extremes are out of whack.
I wonder if someone on an Atmel or Motorola list has done one
that they can share? The lamps I want to use are mostly 100W
240V halogen PAR30 types. Maybe some GLS lamps too.

My dimmer has a minimum level for lamp pre-heat (hopefully to
extend lamp life when used as a chaser) and maximum level,
settable for each output channel. I did this so outputs that drive
things other than lamps don't have a residual voltage on them
when they're supposed to be off !  Any other ideas welcome.
Regards...
___________________________________________
David Duffy        Audio Visual Devices P/L
U8, 9-11 Trade St, Cleveland 4163 Australia
Ph: +61 7 38210362   Fax: +61 7 38210281
New Web: www.audiovisualdevices.com.au
New email: avd@audiovisualdevices.com.au
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