Mechanical sensor and novel motion detection system

The utility model provides a mechanical sensor and a novel motion detection system, and adopts a brand-new mechanical sensor which comprises an insulating shell, a conductive ball movably arranged in the shell and a conductive contact arranged on the inner wall of the shell, the shell is of a polygonal structure, and a plurality of conductive contacts are mounted on the inner wall of the shell; the diameter of the small ball is larger than the distance between any two adjacent conductive contacts. Every two conductive contacts in the shell form a group. One conductive contact in each group of conductive contacts is connected with the power supply module, and the other conductive contact is connected with one interface of the controller; each group of contacts and the small ball form a structure similar to a switch, when the small ball touches one group of contacts, the similar switch is closed, a circuit between the controller and the power supply module is conducted, and a corresponding interface of the cont