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Wireless Sensor Networks (WSN) are spatially distributed micro sensor systems. WSN is a power constrained system, since nodes run on limited power batteries which shorten the life time of the system. Prolonging the life time depends on efficient communication protocol architecture. LEACH hierarchical homogeneous communication protocol which greatly minimizes the energy consumed in collecting and disseminating data. In this paper, impact of heterogeneity in energy of nodes to prolong the life time of WSN is described. A protocol is proposed, which is heterogeneous in energy than the LEACH protocol, further more residual energy of the network is used in which Cluster Head(CH) is selected based on the residual energy of the node and the cluster.
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