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Edit: I've entered in the LED contest, Hurricane Lasers, and Fix & improve it contest. If you like this, please vote.

Original Video - song: river of dreams by billy joel

Using an Apple Pro speaker, I made a flashing RGB LED iPod dock for about $35.
I recommend reading the entire 'ible before starting. Also, note that the volume is control from the iPod.
It consumes minimal power in shutdown mode, and is controlled by a Teensy.
This took me ~3 days to build, and you should know how to solder pretty well before doing this project.
The enclosure looks amazing when lit, it is really fun to watch it.

Step 1: Gather Tools & Materials

Tools:
Soldering Iron
Hot Air gun/Hair dryer
Hot glue gun/epoxy
Drill (or dremel)
Screwdriver
Sandpaper (fine grit)
Wire strippers

Parts:
(1) Teensy 2.0
(1) Sparkfun RGB LED breakout
(1) Sparkfun Mono Audio amp breakout
(1) Apple pro speaker (You only need one speaker, not the set)
(1) Mini-USB cable (will be cut up)
(1) iPod-USB cable (also will be cut)
(1) Audio plug
(1) Push-on/Push-off button
(1) 10K ohm resistor
(1) Roll of solder
(1) Headphone foam cover (black foam circles found on old headphones, I had a few lying around.)
Assorted heat shrink 
Ribbon cable or other thin wire

cool so it reacts to the music? I'd love to see a video of it in action!
I'll post one. <br>
posted.
nice! great project!
Love this project! <br> <br>http://www.instructables.com/id/RGB-flashing-iPod-dock-from-an-old-speaker/ <br> <br>Could there be any bluetooth addition to be able to control lights with custom bluetooth app too?

About This Instructable

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Bio: I love arduino and electronics in general. I enjoy tinkering and various other geeky activities. I also like studying Japanese.
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