International Journal of Advanced Research in Electrical, Electronics and Instrumentation Engineering (IJAREEIE)
The greatest challenge faced by wireless sensor networks is power. When a sensor is depleted of power, it cannot fulfil its role unless and until the source of power is replenished. Therefore, it is considered that the smartness of a wireless sensor expires when its battery power is finished. However, there are emerging wireless sensor applications like building automation, agriculture and so on. In such applications, sensors are supposed to operate for much longer durations (such as years or decades) after they are installed on the field.