Looking for Photocell for LED, 200ma 5v power supply

ken2400 · Jun 5, 2008

I have a 1 watt star that needs a photocell on it. I would be driving it under 200ma and with a 5v power supply. Right now I just use resisters.

Any ideas on supplies or a simple layout?
Where would I buy the stuff? Digikey, Mosslie(sp).

Thanks

jeffosborne · Jun 5, 2008

Okay, I'll bite.

What is the photocell for?
Turn on the LED when it gets dark?

I have a photocell in my attic that turns on the LED lights in my home. It is connected to a comparator IC (LM339) so I can set the turn on/turn off level. The output of the comparator is connected to a MOSFET transistor that controls the LED lights. "dusk to dawn" you might say.

Jeff O.

ken2400 · Jun 5, 2008

Yes I am making a night light so dusk to dawn.

Thanks

jeffosborne said:
Okay, I'll bite.

What is the photocell for?
Turn on the LED when it gets dark?

I have a photocell in my attic that turns on the LED lights in my home. It is connected to a comparator IC (LM339) so I can set the turn on/turn off level. The output of the comparator is connected to a MOSFET transistor that controls the LED lights. "dusk to dawn" you might say.

Jeff O.

ken2400 · Jun 9, 2008

Found this idea.
What if I don't have a black photocell?
Can I use a different one?

Thanks

http://www.evilmadscientist.com/article.php/nightlight

TMorita · Jun 10, 2008

ken2400 said:
Found this idea.
What if I don't have a black photocell?
Can I use a different one?

Thanks

http://www.evilmadscientist.com/article.php/nightlight

I would recommend learning some basic electronics and learning the difference between a photocell and phototransistor first.

Toshi

Looking for Photocell for LED, 200ma 5v power supply

ken2400

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jeffosborne

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ken2400

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ken2400

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TMorita

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