Darkness-activated LED circuit


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
Posted by Gareth Branwyn |
Dec 12, 2007 08:00 PM
DIY Projects, Electronics |
Permalink
| Comments (6)
| Email This |
| Digg this!
Recent Entries
- Animatronic hand plays by fan
- More awesome inflatable subway bag animals
- TCHO chocolate, part two
- Make at The Last HOPE
- Excercise bike Arduino
- Make Projects - Volume 07
- Delft ceramic style cross-stitch mantle clock
- Video software keeps an eye on the sky
- Free sample pages from Dover Publications
- AVR demo platform rocks the color VGA +audio
Comments
Oldest comments listed first.
| Posted by: morcheeba on December 12, 2007 at 10:51 PM |
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.
| Posted by: aragao on December 13, 2007 at 3:05 AM |
It might be linked to the joule thief, so an old 1.5 V battery would power it.
I´l try it.
| Posted by: Julian Bond on December 13, 2007 at 8:23 AM |
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.
| Posted by: Sean on December 13, 2007 at 9:44 AM |
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.
| Posted by: bre on December 13, 2007 at 12:59 PM |
Oh ya! This is awesome... promptly passing this along to my pals at GRL!
| Posted by: cyenobite on December 13, 2007 at 1:13 PM |
Thanks for posting this one! I've been wanting something similar to this for a while now.
Subscribe to MAKE Magazine!
Subscribe today, save 42% and get web access to MAKE free. MAKE Digital Edition is available only to subscribers.
$34.95 / 1 year
(4 Quarterly Issues)
Features and more @ MAKE!
Get MAKE 14 - Subscribe or on newsstands!
Add MAKE to iGoogle - GoogleGoogle.
Add MAKE to your RSS reader - Real simple.
Add MAKE on Twitter.
Add MAKE on FriendFeed & the MAKE room.

Why advertise on MAKE?
Read what folks are saying about us!
Click here to advertise on MAKE!
Phillip Torrone
Senior Editor
Tel: 707-827-7311
Gareth Branwyn
Robot Maker
Kip Kay
Video Maker
Jonah Brucker-Cohen
Artist / Researcher
Natalie Zee Drieu
Senior Editor
CRAFT
Becky Stern
Culture jammer
Collin Cunningham
Sound Maker
Marc de Vinck
CNC Maker


Leave a comment