Re: Light sensor for OFF at dusk and ON at daylight?

["petem" <petem001@xxxxxxxxx>]

<dh@.> a écrit dans le message de groupe de discussion :
oupdc69uqe1sqgqms7ten06vsqbhqp3o9k@xxxxxxxxxx
> On Wed, 20 Oct 2010 23:50:17 -0400, "Petem" <petem001@xxxxxxxxx>
> wrote:
>
>>
>>"Stubby" <William.Plummer@xxxxxxxxxxxx> a écrit dans le message de groupe
>>de
>>discussion :
>>8fd119b3-bc27-448d-b6fb-5e45c597aa16@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>>> On Oct 17, 11:05 pm, dh@. wrote:
>>>> I'm interested in finding a light sensor/110V outlet combination
>>>> that turns things off at dusk an on at daylight, instead of the
>>>> other way around as most of them do. Can anyone suggest where to
>>>> get such a thing, or where else I can ask about it?
>>>
>>> You could use two light sensors in a box (with ventilation!).  The
>>> first looks at the world while the second looks at the light on the
>>> first sensor.
>
>    That idea worked great. It's probably the way I'll go with it
>
>>Just put a 110 volt realy at the place of the lamp connection in a simple
>>dusk detector and use a N.C. connection on it to feed what ever you want..
>>if the relay is OFF (when the detector see some light) the currenty pass
>>..
>>simple simple simple..
>
>    I'm interested in trying that but don't know an easy place to
> get the relay, or what an N.C. connection is. I did however get
> two light sensors like "Stubby" suggested and it seems to work
> pretty well.

110 volt relay are very easy to find..
look there
http://www.radioshack.com/product/index.jsp?productId=2049721&numProdsPerPage=60
you will even see the base for it on the same page..
http://www.radioshack.com/product/index.jsp?productId=2062476&clickid=prod_cs

the schematics of the connection inside the relay is on the top of the
plastic cover.. very easy to work with..



And a N.C. connection is a NORMAL CLOSED connection, so the part of a switch
that normally (without power to the relay) is normal a closed circuit..
(passing current)