In this paper, the authors deal with increase of the network lifetime of EDCS protocol of WSN by utilizing the fuzzy waiting nodes. The paper aim is to make improvements in the fuzzy based EDCS for increasing the stable region of EDCS for clustering hierarchy method of WSNs in heterogeneous sensor networks. For finding the optimal cluster heads, the residual energies of the sensor nodes are used. The proposed technique does not necessitate any global information of energy at any time throughout the lifetime of WSNs. Fuzzy waiting nodes technique are used for the nodes which are waiting for a long time to be converted into a cluster head.