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Wireless sensor network will get wide applicability and acceptance if improved energy efficient routing protocol is implemented. Most of the cluster based hierarchical routing protocols use base station (BS) as a main controller to select cluster heads (CHs) which increases energy consumption and round trip time delay. In this paper, we propose an improved energy efficient routing protocol to maximize the network life time and reduce data delay time. In this proposed protocol, new CH is selected by the current CH instead of the BS based on the maximum residual energy and minimum distance between the CH and a node among all the nodes in a cluster. Unlike the modified LEACH (MLEACH), in the proposed protocol re-clustering is occurred only when the residual energy of the current CHs lower than a threshold value. From the comparison of the simulation results it is proved that the proposed protocol provides …