A real-time orientation tracker, head-tracker, AHRS (Attitude and Heading Reference System) or what ever you want to call it.

It uses the Arduino-compatible "9DOF Razor IMU" board by SparkFun, which contains a 3-axis gyroscope/accelerometer/magnetometer and a microcontroller to do the sensor fusion.
Alternatively the "9DOF Sensor Stick" can be used in combination with an Arduino board.
Wireless tracking is possible when using a bluetooth modem, e.g. the "Bluetooth Mate".

Have a look at the tutorial: github.com/ptrbrtz/razor-9dof-ahrs/wiki/Tutorial

At github.com/ptrbrtz/razor-9dof-ahrs you can find the open source code for:
- the Firmware and the Processing test sketch (Mac OSX, Linux, Windows).
- a C++ library to read the Razor on Mac OSX, Unix and Linux (sorry, no Windows).
- an Android Java library to read the Razor on Android 2.0+ devices.

Music: Deepak Ram
Video: Peter Bartz

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