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Thread: How do I add a photo sensor to a LED nightlight?

  1. #1

    Default How do I add a photo sensor to a LED nightlight?

    I have been making some LED night lights. I now want to put a photo sensor on them. I have some old 4 watt night lights with a photo sensor BUT they did not work. I believe I am not using enought current? It just a transistor - photo cell - resistor.

    Should I change the resistor value. Now it is a RGB then gold one so it is 25 then 7 for the multipler? Should I up it or lower it?

    The transistor is 40
    10
    TagT4

    Thanks

  2. #2
    Flashaholic* carbine15's Avatar
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    Default Re: How do I add a photo sensor to a LED nightlight?

    the only photocell I have is hooked to a potentiometer to adjust the amount of light required for activation.


  3. #3

    Default Re: How do I add a photo sensor to a LED nightlight?

    I recently stumbled onto some LED nightlight replacement bulbs that essentially screw in place of the 7 watt bulbs found in most cheap nightlights. These have 3 5mm LED and claim to cost 25 cents a year when operated 12hours/day so for 50 cents a year 24/7 I put one in my fridge door where the water/ice dispenser is and lights up the kitchen and another in the living room over the answering machine. I got the bulbs in 2packs at walgreens for $3.99.
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  4. #4

    Default Re: How do I add a photo sensor to a LED nightlight?

    I wonder if they would work?
    http://www.walgreens.com/store/produ...id=prod2419636



    Quote Originally Posted by Lynx_Arc
    I recently stumbled onto some LED nightlight replacement bulbs that essentially screw in place of the 7 watt bulbs found in most cheap nightlights. These have 3 5mm LED and claim to cost 25 cents a year when operated 12hours/day so for 50 cents a year 24/7 I put one in my fridge door where the water/ice dispenser is and lights up the kitchen and another in the living room over the answering machine. I got the bulbs in 2packs at walgreens for $3.99.

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