Many advances have been made in sensor technologies which are as varied as the applications and many more are in progress. It has been reasonable to design and develop small size sensor nodes of low cost and low power. Wireless Sensor Networks (WSNs) are large networks made of a numerous number of sensor nodes with sensing, computation and wireless communication capabilities. The reasons for using wireless network are cost effectiveness of network deployment and its applicability to environments where wiring is not possible or it is preferable solution compared with wired networks.