In this thesis, we firstly introduce the architecture, characteristics and applications of WSNs, and point out the state-of-art of WSNs and sensor node. Then, modular scheme of sensor node is proposed, following the explicit scheme of interface module processor, wireless communication, sensor and power supply. In hardware design, the comparison among various types of devices, the design of circuit and electric rules are discussed in detail. In addition, this article also designs a software framework of sensor node, and proposes the detailed process of the multi-sensor module, interface, processor, the SPI interface of the communication module for node and the adaptive application of data processing. The whole software framework makes the functional design of the node module realized.Subsequently, we evaluate the performance and functionality of the new multi-sensor node based on an experimental testbed. Finally, we summarize the work and make an outlook in the future.
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