The RoboRaptor has very few internal sensors, and they are all switches. There are five degree's of freedom, and only three have some form of positional feedback.

Neck

The Neck has four switches, these determing when the head is in the correct up, down, left or right position.

Left and Right Leg Switches

The switch in the left and right hip is used to determine when the leg is in its neutral (at rest) position