Engineering Research Publication
In previous year batteries have been the source of energy for wireless sensor network. These batteries are limited source of energy. So for wireless sensor network to work for a life time, they need a self-powered energy sources. These self-powered devices extract energy from their surrounding environment and the process of extracting energy from surrounding environment is called energy harvesting. It is originated from wind-mill and water-wheel. It is also have low-maintains cast and used for variety of application. The various form of energy harvesting sources is thermal, mechanical, solar, wind and wave.