Abstract: Systems and methods for monitoring presence and movement are provided. One or more wave sensors configured to emit sound waves and detect reflections of the emitted sound waves may collect measurements data that is provided to one or more processing components, such as a smart security camera or a home security system. The measurements data may be evaluated in order to determine a location of a monitored subject and to detect changes in the location of the monitored subject. In this regard, movement of the monitored subject may be tracked and utilized to implement a wide variety of control actions, such as the control of security cameras and/or the triggering of alarm events.