I made this embroidered patch in a different instructable, but here I'll show you how to add flashing LEDs to your backpack for fun and safety. I used a LilyPad Arduino with a rechargeable lithium-polymer battery for flatness and re-usability. The LEDs blink in a marquee pattern, two at a time, in patriotic red, white and blue, in fitting with this year's "Re-Make America" Maker Faire theme. Check out this project on Make: Projects and the video from CRAFT.

Step 1: Materials and Tools

Materials and Tools:
-needlenose pliers
-sewing needle
-LilyPad Arduino with programmer and USB cable - Maker Shed

-LiPower board - Sparkfun
-lithium-polymer battery (and charger) - Sparkfun
-LilyPad AAA battery holder (comes with the Maker Shed kit linked above)

-conductive thread - Lame Lifesaver
-conductive velcro - Less EMF
-sticky-back velcro (I got mine at Michael's)
-bag or backpack
-fabric patch to mount circuit
-small scrap of fabric for switch
-source code and schematic

Coil the leads of each LED: make the longer lead (positive) into a square spiral, and the shorter lead (negative) into a round spiral.

Awesome, that was a fun project. I ended up using the 'Simple' Lilypad and only 8 lights, lining the back to protect the electronics, and making it snap on instead. Thanks so much!
You are great. Excellent.
Watch your patch animation while listening to Franz Ferdinand's Take me out. After the Ritardando at about 1:00 the LEDs sinc up. The same two blink on the quarter note and then it moves on counterclockwise.<br/><br/>BTW this instructable inspired me to make this...<br/><a rel="nofollow" href="http://www.instructables.com/id/Make-an-LED-Bow-Tie/">http://www.instructables.com/id/Make-an-LED-Bow-Tie/</a><br/>
Very nice Instructable :)
Based on your cool tutorial, I cobbled together a marquee with my Duemilanove. Thanks for the inspiration!
looks great! I also &lt;3 animated gifs. =]<br/>
Loved this instructable, especially the video. Hope you start making a lot more. (oh and awesome music at the end of the video)
This is so cool! (and a fantastic animated gif, haha) The velcro was a great idea for removing at the airport or on a rainy day!
Very COOL!
Where is the rap music?

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