IMUs

We suspect we'll need some sort of IMU to detect rotation. To keep things simple maybe just use a gyro sensor?

Here's a good link for some example code for the L3GD20H sensor from Adafruit

http://davekopp.weebly.com/minimu-inertial-measurement-unit-driver-for-raspberry-pi-lsm303d-and-l3gd20h.html