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Our homeboy Windell, over at EMS Labs, has posted a simple circuit for creating a dark-detecting LED light. It's a power-conserving LED Throwie.
A Simple and Cheap Dark-Detecting LED Circuit - Link
Darkness-activated LED circuit
Posted by Gareth Branwyn |
Dec 12, 2007 08:00 PM
DIY Projects, Electronics |
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That's cool how it's an infrared-detecting switch... it'll go off under sunlight, but it'll remain on even if an LED (like the one it's connected to) or a streetlight shines on it.
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It might be linked to the joule thief, so an old 1.5 V battery would power it.
I´l try it.
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Here's what I want, a dark sensing, joule thief, flashing, throwie. The idea is a minimal circuit that will give a brief flash once every few seconds, only comes on at night and uses a battery sparingly until it's completely dead.
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It would be interesting if they used the LED itself to sense the ambient light (LEDs can be used as photodiodes). Flash it really fast when it is dark - it will look like it is just on, and alternate with sensing and illuminating.
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Oh ya! This is awesome... promptly passing this along to my pals at GRL!
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Thanks for posting this one! I've been wanting something similar to this for a while now.
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