I participated in the 2014 University of Miami Association for Computing Machinery 24 hour hack-a-thon. This was a neat event that encouraged students to work on some kind of project to show off at the end of the 24 hour period.
My project was a range-of-motion physical therapy device with both audio and visual feedback. I sewed flex resistors into compression sleeves which I attached to an Arduino via conductive thread. The Arduino provided audio feedback; the angle of your arm corresponded to a musical note. Flat was the root, angled was the major third, further angled was the fifth, and fully compressed was the octave.
The Arduino then transmitted the resistor values over USB to the computer, which provided the visual feedback through an app I wrote in Processing.
My project won the event award for best use of sponsor provided equipment (Zensah brand compression sleeves).
Below is a .zip file containing the Arduino code, Processing code, a screenshot, a powerpoint, and the circuit diagram (Fritzing).