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This Instructable explains how to construct and modify a 5 Channel "Flame-less" LED Candle driver.

Our hackerspace "The Rabbit Hole" is having a pumpkin carving night and we wanted to try something different to light the pumpkins. So I came up with this Flamless LED candle that uses an inexpensive IC and parts but simulates the random flickering of a candle. 

When complete this circuit emulates the flicker of a candle including random "wind / draft" events of fast dim flickering. The 5 LEDs flicker at different rates and intensities allowing you to drive 5 individual candles with a course effect, one candle with a smoother effect, or any combination in between. 

The first part of this Instructable goes over kit construction which are available from tymkrs.com at [add link to store here]. If you wish to build a unit from scratch all the design data is available at http://www.wire2wire.org/LED_candle/LED_candle.html

The second half of the Instructable goes over the circuit operation and firmware in greater detail. 

Here is a video of the prototype circuit running on my bench. 

And here is a demo of the final kit set up in a jack-o-lantern pumpkin.
 

Step 1: Required Materials for the Flame-less LED Candle Simulator

To construct this project you will need the following:
<p>I made up a set of these for Halloween, they worked great! My daughter wanted one for her bedroom, and as such, I made a simple lamp using Dollar Tree poster board and tissue paper as a diffuser. She absolutely loves it. Thank you for sharing your project.</p>
You know, with a cheap mic, you could use it to trigger and change the wind mode based upon the input signal level. More input equals less light, could even place a threshold where if you blew hard enough it would switch off.
Yep that idea has been brought up before. The micro used in the current design is very very basic does not even have interrupts. Upgrading to a different part with a analog input would make implementing the sound input easy.
Ah. I suspected that some &quot;bright&quot; soul had probably already come to a similar conclusion, probably yourself. I really, really like this. I'm considering making a very realistic candelabra for my mother using realistic looking polymer/resin cast candles, hand turning brass or pewter candle holders and routing a very elegant base from a rich wood, then finding a way to use your design to drive a display to very closely mimic candle flames. She currently keeps a low cost 110v incandescent bulb unit in our front bay window all year round. There is very strong symbolic meaning and sentiment for her in doing this. The lights are a path for her four lost grandchildren, so that maybe in time, they will see the light in the darkness and return home to a safe haven. Even after seven years she believes that one day my children will come home... I'd like to do something that looks realistic, will last nearly forever, and get rid of that cheap plasticy power wasting eyesore and replace it with something of beauty. Something that might fool the observer, or at least captivate and invite questions. But more importantly, equal in beauty the desire she holds in her heart.
HEY <br>AM TRULY IMPRESSED BY YOUR WORK <br>BUT I WILL LIKE TO ASK YOU, IS THERE NO WAY YOU CAN TAP VOLTAGE FROM THE OUT PUT AND RETURN IT TO A CHARGER TO CHARGE UP THE BATTERY WHILE STILL WORKING SO THAT THE LED WILL REMAIN PERMANENTLY ON, SEND ME RESPONSE TO THIS MAIL I WILL LIKE TO CONNECT TO YOU (KANDRIS2012@GMAIL.COM)
Sorry no due to the laws of thermodynamics that is just not possible. Even if you assume everything else is a ideal device (ie no losses due to switching or heat) at the very minimum your loosing energy in the form of light being emitted by the LEDs. So over time the net energy of the system is going down. If your looking to extend the life of the batteries the best way to do that is to either use less LEDs or set the led current to a lower value. The kit described here what set up to yield the brightest output for maximum pumpkin illumination.

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