Wireless sensor node is a combination of many small sensor nodes, also called motes and each mote has a capability of sensing and forwarding the data to the other motes and a gateway (to send information globally on internet) which is commonly known as sink. Sensor nodes limited energy and memory are important factors to be worked upon. Energy consumption rate increases highly if all sensor nodes send data individually to the base station which reduces survival time of node. This is commonly known as hot spot problem. On the other hand the equal size clusters waste energy according to the network density.