Sensors networks are in widespread use in factories, industrial complexes, commercial and residential buildings, agricultural settings, and urban areas, serving to improve manufacturing efficiency, safety, reliability, automation, and security. These networks perform a variety of useful functions including factory automation, measurement, and control; control of lighting, heating, and cooling in residential and commercial buildings; structural health monitoring of bridges, commercial buildings, aircraft, and machinery; tire pressure monitoring systems (TPMS); tank level monitoring; and patient monitoring in hospitals and nursing homes.