Here's the humanoid robot neck design that I have at the moment in my humanoid robot. Works reasonably okay, though I'm sure some improvements can be made.
Also, I'm testing bi-directional communication between Raspberry Pi and Arduino. I see the Raspberry Pi as the brain and the Arduino as the actuation/muscles and sensing controller. This is just a simple test of how the two work together, but shows that communication via Serial with an USB cable works.
3D parts for the neck: https://www.thingiverse.com/thing:4558004
Audio:
Robot City - Quincas Moreira
The Machines Dream - South London HiFi
