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
12 thoughts on “Darkness-activated LED circuit”
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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.
It might be linked to the joule thief, so an old 1.5 V battery would power it.
I´l try it.
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.
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.
Oh ya! This is awesome… promptly passing this along to my pals at GRL!
Thanks for posting this one! I’ve been wanting something similar to this for a while now.