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?How to wire up a photocell with LEDs

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mach1mustang

Joined: Apr 15 2005
Posts: 12


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Post Tue Feb 07, 2006 9:47 am

?How to wire up a photocell with LEDs

I am using 8 various LEDs w/resistors to lightup my daughter wall castle diarama using standard batteries like 4/aaa or a 9v in an on/off case. While it looks great at night, I don't want it to be on 24/7 and don't want to continually use the on/off switch. I want it to go on every night like a night light would.

I have the photocell's but when placed in between the power feed line it only dims the LED, it doesn't turn it completly off. I've also tried to use the guts of a night light as those are the on/off function but those are designed for 110V house electricity and have other resistors and capacitors etc to control the electricity and will not work with the the battery power source.

electrical guru's out there?
Recon

Joined: May 27 2004
Posts: 1615
Location: Reno, Nevada


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Post Tue Feb 07, 2006 10:23 pm

I think there was a post about light activated stuff a while back, I looked for a little bit, but couldn't find anything.
But I know it was posted, so maybe search around for it
TheBrick

Joined: Oct 07 2003
Posts: 4140
Location: Niagara Falls, Canada


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Post Tue Feb 07, 2006 10:25 pm

try to contact Adrian. He is very knowledgable and might be able to help you.
alkatmsu

Joined: Nov 08 2005
Posts: 1560
Location: Kentucky


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Post Wed Feb 08, 2006 12:38 pm

I don't know crap about it, but I would speculate that it may have something to do with an electric outlet having a different voltage than a couple of AA batteries.
alienyoungjr

Joined: Apr 30 2004
Posts: 4654
Location: Texas


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Post Wed Feb 08, 2006 3:28 pm

alkatmsu wrote:
I don't know crap about it, but I would speculate that it may have something to do with an electric outlet having a different voltage than a couple of AA batteries.


nop, if you look in the night light it has more circuitry than just a photo cell. A photo cell basically acts just like a resistor, except light increases the resistance. You have to build a circuit to cut the power when the resistance reaches a certain level, and this is about as far as my electronics knowledge can take you.
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