More advanced LED POI we are working on include 9-axis inertial measurement unit (IMU) (3-axis accelerometer, 3-axis gyro, 3-axis magnetometer).  We coupled this with a wireless transciever to send data back to a computer while we're spinning. 

The goal is to use this feedback to show us how the sensors are responding to various motion conditions so we can program better effects.  This project is still in an early phase, we're still working on understanding the quaternion output of the IMU's on board data fusion engine and how best to use that data.

Total cost for this POI is still very cheap, Arduino Nano, 9V battery, RGB LED, IMU (about $8), radio ($1).

Here is a video showing wireless data streaming back to a computer http://youtu.be/me-uFxpgRTk

 

POI wireless demo 1