Arm tracking with smartphones

During my PhD, I've become interested in utilizing smartphones in dynamical experiments.
I've used various sensor fusion algorithms to estimate the orientation of smartphones attached to the human arm.

In the final version I've ended up with Sebastian Madgwick's 9-axis AHRS algorithm, and developed an Android application which calculates the orientation and sends the resulting quaternion to the PC over WiFi. The PC application shows the orientation of the arm (assuming that the shoulder is fixed).

Skills gained & improved: