SINGLE-SENSOR DOOR/WINDOW STATE DETECTOR

摘要

A security apparatus is described for determining a condition of a door or window. In one embodiment the apparatus comprises a sensor for measuring an attribute that varies as a first door or window condition is achieved and as a second door or window condition is achieved, and for generating signals indicative of the attribute, and a processor coupled to the sensor for determining the first door or window condition and the second door or window condition based on the signals from the sensor.