Patent ID: 8791899

Claim:
An apparatus configured to detect user initiated movement by an input element handled by a user, the apparatus comprising: a calibration input unit configured to perform a calibration procedure that is initiated by the user via a physical movement performed by the user; and at least one sensor positioned by the user to dynamically adjust a size of an effective workspace range capable of detecting the user's movement of the input element, wherein the calibration unit comprises a button that is disposed on a rigid arm and is moveable by movement of the rigid arm from a stored position within a housing of the sensor to an outward position at a known position relative to the sensor, wherein the button is coupled to the at least one sensor and is selectable by the user using the input device, wherein selection of the button by the input device establishes a position of the input device at the button relative to the sensor, wherein the sensor is adapted to sense the position of the input device when the input device is on the button, and wherein the calibration input unit is configured to perform the calibration procedure by comparing a known position of the button relative to the sensor with a sensed position of the button as detected by the input device being placed on the button.