1. A wall-mounted device for sensing and control for one or more systems in a home environment, said device comprising: a body having a circular cross-section, a wall-facing rear surface, and a user-facing front surface; an outer ring that laterally surrounds said body to form a circular lateral periphery of said device, said outer ring being user-rotatable around said body and being inwardly pressable; at least one environmental sensing component disposed within said body; a communication component configured for providing wired or wireless sensing and/or control-related communications with said one or more systems in the home environment; a user-facing circular display component configured to highlight respective ones of a circular arrangement of display elements appearing near a periphery thereof as a user rotates said outer ring; a user input component formed by said user-facing circular display component and said outer ring, wherein a user selection of one of said display elements is established upon an inward pressing of said outer ring while said one of said display elements is highlighted, and wherein plural respective user selections of different ones of said display elements are established by repeated user rotations and inward pressings of said outer ring; and a processor in operative communication with said at least one environmental sensing component, said communication component, and said user input component; wherein said processor is configured and programmed to provide a software lockout functionality in which user access to the control of one or more sensing or control functions of said device is prevented unless a user enters a password or combination using said user input component.
2. The device of claim 1 , wherein said at least one environmental sensing component comprises a temperature sensor, an infrared sensor, and a visible light sensor.