After a long period of absence, here I am again. I just started to write the instructions for head gesture recognition, but I'm not finished with it yet. Erick will help me with the codes, in order to be well documented and have some useless lines hidden. 

The face recognition step is almost finished. Tomorrow I'm planning to write the head pose estimation step.

I think I need to write a separated instruction about the Bluetooth communication between the CHIP (Linux) and the Arduino as well. But one step at a time, right? ;)