This was a project I worked on with a Bio-engineering student during my last semester at Berkeley. It's based off a technique to detect bone fractures using a tuning fork and stethoscope (read about that here: We had a working prototype done before I left the project, but I believe she's still working on it with a team at UCSF.

The code and enclosure files live here:

Photo of Fractal prototype, measuring vibrations across a bone in the arm.

Here's a video presentation I made about it: