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In this paper, a Wireless Sensor Network node based on Wi-Fi is constructed. Wi-Fi is connected through SPI to form relative energy saving wireless transmission. Firstly, the overall module design framework is introduced, followed by the hardware and software design respectively. This project focuses on the node expansibility, taking TQ2440 as the base hardware platform, which is rich in interfaces with reserved extensive area. On the other hand, eCos is adopted to provide the real-time performance. After the drivers' implementation on eCos, which contain serial, flash, Ethernet and Wi-Fi, OLSR route protocol is ported to eCos as system route used in the data transmission course. Ultimately, nodes are deployed in AdHoc mode network for test, which proved that the wireless data acquisition and transmission is available for the node construction. Meanwhile, the AdHoc mode can enhance the robustness of the network reducing the network failure due to the router crashing in the central control network. It is believed that the node realizes a prototype which can be used in most of the remote monitoring scene.