In this paper

we design and implement a low-power wireless sensor network node.Firstly

by analyzing and comparing a variety of exiting node design

we select low-power chips

and propose a low-power node design based on the MSP430F149 processor and nRF24L01+wireless transceiver chip.Then

we describe the system software design.Finally

we test and analyze the energy consumption of the node carefully.The results show that the proposed node design and energy management strategies can achieve low power consumption of the node.