RE: Re: Analogue Light Sensor (for Ken Watt)

[Mike Griffiths <mike@xxxxxxx>]

I mounted mine in Telephone extension face plates along side the Temp
sensors
As to sensitivity
If you put them out side they overload
but I have one on an inside window ledge pointing out and that gives me
Outside daylight
I haven't filtered them at all though I tried to with the outside ones and
gave up
If you buy the range then you can select the one that is right for the
aplication, hence my mounting them in Transistor holders

Its about two years since I worked on mine
and the have been in since and working with HV without a problem
hence my vagueness  over some bits
To check them I wrote the value ever minute to a text file which was then
being accessed as External data in MS Access that was then drawing a graph
a kind of Geek Oscilloscope !!
but it was great for seeing how hey worked
Once set I then decreased the sample frequency and had a graph of Temp and
light
given up with that now though as it is interesting to set up but very
boring
after a week or two
Mike

-----Original Message-----
From: psghome2002 [mailto:psghome@xxxxxxx]
Sent: 07 February 2002 08:52
To: ukha_d@xxxxxxx
Subject: [ukha_d] Re: Analogue Light Sensor (for Ken Watt)


Thanks Mike,

Apparently these parts have now been replaced by the R option -
don't know what's different though.

How have you mounted yours and how did you modify the sensitivity
(lens cover or RL resistor between output and ground?) - I presume
the sensor is overloaded in sunlight?

Paul.

--- In ukha_d@y..., Mike Griffiths <mike@a...> wrote:
> Paul
> I've used the Texas TSL range
> They work fine best to get one of each from RS and see which
sensitivity
> suits your application
> As I have said before the hard part is working your schedule to
understand
> that they will react to both natural light and a Lamp being
swithched on
> When the sun is streaming through my windows the lights go off and
come back
> on when it isn't
>
> http://www.csi3.com/HOMEVIS/light_sensor.pdf
> for a link
>
>
> Mike
> At Home
>
>
> -----Original Message-----
> From: psghome2002 [mailto:psghome@xxxxxxx...]
> Sent: 06 February 2002 20:12
> To: ukha_d@y...
> Subject: [ukha_d] Analogue Light Sensor (for Ken Watt)
>
> I've found the spec sheets on these TI sensors that just need a 5v
> supply and give a variable voltage output. There were a few
threads
> on light sensors on the HomeVision list but I havn't found anyone
> yet who's successfully calibrated the output to get sensible data
to
> use in a schedule. I guess a just few bands would be usefull,
maybe
> 5-6 that might indicate dark, twilight, dusk, daylight, overcast,
> etc.
>
> http://www.taosinc.com/products.htm#tsl250r
>
> Anyone using something similar? or have ideas for practical
> application using X10 dimming for example?
>
> Paul.
>
>
>
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