Recently, I built a motion sensitive LED belt for a dance performance by my wife. In case it is of interest to others, this post will briefly describe how I made it.
Adding the accelerometer is very simple. The 3V in and ground are soldered with short wires to the corresponding pins on the Atmega32u4 breakout board, and wires from the X,Y, and Z outputs can be soldered to the F4, F5, and F6 pins (see here or here for a good diagram).
After a lot of tweaking, here is the code we actually used for the performance.
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