Movement sensing device

A movement sensing device adapted to sense an amount of movement of an object, and comprising:

• a first magnetic sensor;
• a second magnetic sensor;
• a special-shaped magnetic element having a magnetization direction, being connected to the object, and being adapted to be moved along a direction parallel to a connection line between the first magnetic sensor and the second magnetic sensor, wherein the special-shaped magnetic element, the first magnetic sensor, and the second magnetic sensor are disposed on a plane, and the magnetization direction is perpendicular to the plane;
• and
• a controller electrically connected to the first magnetic sensor and the second magnetic sensor, wherein the controller calculates the amount of movement according to a difference between magnetic forces sensed by the first magnetic sensor and the second magnetic sensor from the special-shaped magnetic element, the amount of movement is a distance between a reference point on the special-shaped magnetic element and a center point in the direction parallel to the connection line, and the center point is a center between a position of the first magnetic sensor and a position of the second magnetic sensor.