A sensor is a device that measures a physical quantity and converts it into a signal which can be read by an observer or by an instrument. The rapid advancement in computing has enabled the development of low cost wireless sensor networks (WSNs), and making WSNs one of the most important research areas. These are wireless ad-hoc network that connect deeply embedded sensors, actuators, and processors. This combination of wireless and data networking will result in a new form of computational paradigm which is more communication centric than any other computer network seen before. In the past few years, much...