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Re: Light levels
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David,
I did something similar a while back, pre my xAP days. From what i
remember of it, it was a fiddle! I ended up simply reading the light
level and if it was outside a +-5% of the required level I nudged the
light's dim level by 5% in the right direction. This was done every 30
seconds or so. On the whole it worked ok but as i remember it the issues
were.
Sensor position. This was critical. It must be placed somewhere where
shadows wouldn't hit it and direct sunlight was to be avoided. I had it
above the window pointing inwards.
Time between checks. A big fiddle. On a drawing board you could say the
sun rises and sets so the light level is a simple and fairly constant
fade, nope! Things like a dark cloud going over quickly could cause a
delayed reaction as the sampling intervals could miss the initial fade
to dark and just catch it as the cloud moves away. One advantage of
short checks is you can catch anyone shutting the curtains and turn the
lights on quickly
The temptation is then to sample more often. Then simple things like
reflections hitting the sensor or just people moving around would give
confusing readings and yo-yo lighting.
Size of the band from the required level. This was just trial and error!
Season. Just when all was happy and it all worked, the seasons changed.
Well obviously this didn't happen overnight but the winter light is very
different to the summer one and needs a slightly different set of tweaks.
I know I tried a few different plans and the one that seemed the best
was also the simplest. Have a light level you want and if the current
level is too low or high then nudge the lamp level a bit, wait and
repeat. This stopped sudden and probably wrong changes of light and as
I sampled the level quite slowly I added a simple sensor to generate a
trigger if the curtains closed.
I must try this all again and see how it goes. Having those analog ins
on the Netiom should make it much easier! Also if a good method gets
worked out i can build it into xAP Floorplan so it'll be really easy for
other to use.
HTH
James
David Pullen wrote:
> I have done some searching on various forums and not been able to find
> much on controlling light levels. There is a lot of stuff on DawnDusk
> etc but I already do that. I don't know if the lack of information
> means that it is very difficult to achieve but I thought I would try a
> few experiments. I have been using light dependent resistors (in
> series with a variable pot) connected to the analogue inputs of a
> Netiom-xAP. I seem to get a very good range of readings when the pot
> is tuned - using effectively the whole range of the analogue input.
> The readings are not exactly linear but they do differentiate light
> levels quite well.
>
> I am trying to use the light levels to alter the dimming levels via
> Homeseer. First of all I created events to react to changes in light
> levels but I think it works better if I just run recurrent events that
> check the levels and then adjust the dimming level depending upon the
> light level. The trials, so far, indicate that it should work but it
> will need to be carefully tuned for levels and positioning.
>
> The reason for this mail is to see if any one else has experimented
> with this. If it works well then I will apply it to certain well-used
> rooms where we want to keep the light levels fairly constant, eg the
> kitchen. BTW the events only kick in when the lights are actually
> activated. Of course, the idea is that other light sensors (that are
> not affected by the internal lights will sense when the lights need to
> be activated and occupancy sensors will determine if the lights need
> to be switched on. I plan to do quite a lot of experimentation before
> unleashing the whole thing on the family (otherwise it will go
> horribly wrong!) but I am really interested to learn of any other
> experiences.
>
> The whole thing could be extended with different scenes for room that
> have more variable use although it could start to get rather
complicated!
>
> Suggestions/thoughts/comments please.
>
> BR
>
> David
>
>
>
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David,<br>
<br>
I did something similar a while back, pre my xAP days. From what i
remember of it, it was a fiddle! I ended up simply
reading the light
level and if it was outside a +-5% of the required level I nudged the
light's dim level by 5% in the right direction. This was done every 30
seconds or so. On the whole it worked ok but as i remember it the
issues were.<br>
Sensor position. This was critical. It must be placed somewhere where
shadows wouldn't hit it and direct sunlight was to be avoided. I had it
above the window pointing inwards.<br>
Time between checks. A big fiddle. On a drawing board you could say the
sun rises and sets so the light level is a simple and fairly constant
fade, nope! Things like a dark cloud going over quickly could cause a
delayed reaction as the sampling intervals could miss the initial fade
to dark and just catch it as the cloud moves away. One advantage of
short checks is you can catch anyone shutting the curtains and turn the
lights on quickly<br>
The temptation is then to sample more often. Then simple things
like
reflections hitting the sensor or just people moving around would give
confusing readings and yo-yo lighting.<br>
Size of the band from the required level. This was just trial and
error!<br>
Season. Just when all was happy and it all worked, the seasons changed.
Well obviously this didn't happen overnight but the winter light is
very different to the summer one and needs a slightly different set of
tweaks.<br>
<br>
I know I tried a few different plans and the one that seemed the
best
was also the simplest. Have a light level you want and if the current
level is too low or high then nudge the lamp level a bit, wait and
repeat. This stopped sudden and probably wrong changes
of light and
as I sampled the level quite slowly I added a simple sensor to generate
a trigger if the curtains closed.<br>
<br>
I must try this all again and see how it goes. Having those analog ins
on the Netiom should make it much easier! Also if a good method gets
worked out i can build it into xAP Floorplan so it'll be really easy
for other to use.<br>
<br>
HTH<br>
<br>
James<br>
<br>
David Pullen wrote:
<blockquote cite="mid007a01c57e4d$10117bd0$3300000a@dplaptop"
type="cite">
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<title>Light levels</title>
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<p align="justify"><span
lang="en-gb"><font face="Arial"
size="2">I
have done some sear</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2">c</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2">hing
o</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font
face="Arial"
size="2">n</font></span><span
lang="en-gb"></span><span
lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb">
<font
face="Arial"
size="2">various</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2"> for</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2">u</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2">ms
and not been able to find much on controlling light
levels</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2">.
Ther</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font
face="Arial"
size="2">e</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2"> is</font></span><span
lang="en-gb"></span><span lang="en-gb">
<font face="Arial" size="2">a
lot</font></span><span
lang="en-gb"></span><span lang="en-gb">
<font
face="Arial" size="2">of stuff on DawnDusk etc but I
already do that.</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2"> I
don</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font
face="Arial"
size="2">’</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2">t know if the lack
of</font></span><span
lang="en-gb"></span><span lang="en-gb">
<font face="Arial"
size="2">information</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2">
means that it is very difficult</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2"> to achieve</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2">
but I though</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font
face="Arial"
size="2">t</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2"> I</font></span><span
lang="en-gb"></span><span lang="en-gb">
<font face="Arial"
size="2">would</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2">
try a few experiments. I have been using light dependent
resi</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2">s</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2">tors</font></span><span
lang="en-gb"></span><span lang="en-gb">
<font face="Arial" size="2">(in
series with a variable pot)</font></span><span
lang="en-gb"></span><span
lang="en-gb"> <font face="Arial"
size="2">connected to the analogue
inputs of a Netiom-xAP</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2">. I seem to get a very good
range of readin</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2">g</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2">s
when the pot is tuned</font></span><span
lang="en-gb"></span><span
lang="en-gb"></span><span
lang="en-gb"></span><span lang="en-gb">
<font
face="Arial"
size="2">–</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2"> using effectively the whole
range of the analogue input.</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2"> The readings are not exactly
linear but they do differentiate light levels quite
well.</font></span></p>
<p align="justify"><span
lang="en-gb"><font face="Arial"
size="2">I
am trying to use the</font></span><span
lang="en-gb"></span><span
lang="en-gb"> <font face="Arial"
size="2">light</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2">
levels to alter the dimming levels via
Hom</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2">e</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2">seer.
First of all I create</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2">d</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2">
events to react to changes in light levels but I think it works better
if I just run recurrent events that check the levels and then adjust
the dimming level depending upon the light
level.</font></span><span
lang="en-gb"></span><span
lang="en-gb"></span><span
lang="en-gb"></span><span
lang="en-gb"> <font face="Arial"
size="2">The trials</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2">,</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2"> so
far</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font
face="Arial"
size="2">,</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2"> indicate that it should work
but</font></span><span
lang="en-gb"></span><span lang="en-gb">
<font
face="Arial" size="2">it will need to be carefully
tuned for levels</font></span><span
lang="en-gb"></span><span lang="en-gb">
<font face="Arial"
size="2">and</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2">
positioning. </font></span></p>
<p align="justify"><span
lang="en-gb"><font face="Arial"
size="2">The
reason for this mail is to see if any one else has
experim</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2">en</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2">ted</font></span><span
lang="en-gb"></span><span lang="en-gb">
<font face="Arial"
size="2">with</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2">
this</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font
face="Arial" size="2">. If it works well then I will
apply it to
certain well</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font
face="Arial"
size="2">-</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2">used rooms where we want to
keep the light levels fairly constant, eg the
kitchen.</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2">
BTW the events only</font></span><span
lang="en-gb"></span><span
lang="en-gb"> <font face="Arial"
size="2">kick</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2"> in
when the lights are actually activated. Of
course</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2">,</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2">
the idea is that other light sensors (that are not affected by
the</font></span><span
lang="en-gb"></span><span lang="en-gb">
<font face="Arial" size="2">internal
lights will sense when the lights need to
be</font></span><span
lang="en-gb"></span><span lang="en-gb">
<font face="Arial"
size="2">activated</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2">
and occupancy sensors will</font></span><span
lang="en-gb"></span><span
lang="en-gb"> <font face="Arial"
size="2">determine</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2"> if
the lights need to be switched on. I plan to do quite a lot
of</font></span><span
lang="en-gb"></span><span lang="en-gb">
<font face="Arial"
size="2">experimentation</font></span><span
lang="en-gb"></span><span
lang="en-gb"></span><span
lang="en-gb"></span><span
lang="en-gb"> <font face="Arial"
size="2">before</font></span><span
lang="en-gb"></span><span lang="en-gb">
<font face="Arial"
size="2">unleashing</font></span><span
lang="en-gb"></span><span
lang="en-gb"></span><span
lang="en-gb"></span><span
lang="en-gb"> <font face="Arial"
size="2">the whole thing</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2"> on
the family (otherwise it will go horribly wrong!) but I am really
interested to learn of any other</font></span><span
lang="en-gb"></span><span
lang="en-gb"> <font face="Arial"
size="2">experiences</font></span><span
lang="en-gb"></span><span
lang="en-gb"><font face="Arial"
size="2">.</font></span><span
lang="en-gb"></span><span
lang="en-gb"></span></p>
<p align="justify"><span
lang="en-gb"><font face="Arial"
size="2">The
whole thing could be extended with different scenes
for</font></span><span
lang="en-gb"></span><span lang="en-gb">
<font face="Arial" size="2">room
that have more variable use although it could start to get rather
complicated!</font></span><span
lang="en-gb"></span><span
lang="en-gb"></span></p>
<p align="justify"><span
lang="en-gb"><font face="Arial"
size="2">Suggestions/thoughts/comments
please.</font></span></p>
<p align="justify"><span
lang="en-gb"><font face="Arial"
size="2">BR</font></span></p>
<p align="justify"><span
lang="en-gb"><font face="Arial"
size="2">David</font></span><span
lang="en-gb"></span></p>
<br>
<br>
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href="http://groups.yahoo.com/gads?t=ms&k=Support&w1=Home+automation+control&w2=Home+automation&w3=Computer+internet&w4=Device&w5=Support&w6=Intended&c=6&s=112&.sig=LHxWNdAYmqPCwIlLZxA4AA";>
</a></td>
<td style="width: 25%;"> <tt><a
href="http://groups.yahoo.com/gads?t=ms&k=Intended&w1=Home+automation+control&w2=Home+automation&w3=Computer+internet&w4=Device&w5=Support&w6=Intended&c=6&s=112&.sig=7vdjoL6QZ2EmoUzAbpihjA";>Intended</a></tt>
<a
href="http://groups.yahoo.com/gads?t=ms&k=Intended&w1=Home+automation+control&w2=Home+automation&w3=Computer+internet&w4=Device&w5=Support&w6=Intended&c=6&s=112&.sig=7vdjoL6QZ2EmoUzAbpihjA";>
</a></td>
</tr>
</tbody>
</table>
</blockquote>
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