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Routing protocol is a key technical issue in wireless sensor networks (WSN), and the appropriate routing scheme can make the energy-constraint sensor node consume as less energy as possible to prolong the network lifetime. The suitable sensor circuits and systems are beneficial to nodes energy savings. In this paper, we propose a protocol called CEERP (Cost-based Energy-Efficient Routing Protocol). Each node finds the appropriate transmission path through calculating and comparing the values of the related cost-functions. Experimental results show that the proposed CEERP outperforms existing methods to maximize network lifetime with less latency.