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针对大田应用中传感器多样、低功耗、低成本、通信可靠等要求,设计了一款无线传感器网络节点。节点以MSP430F1611单片机为核心,Si4432作为无线通信模块,采用太阳能板和可充电式锂电池互补供电的方式提供电源。同时,选用了扰动观察法作为太阳能最大功率跟踪算法(MPPT算法),采用了周期性采样策略,并对相邻节点数据进行组合的数据融合方法。本文测试并分析了节点的功耗、通信距离与丢包率之间的关系及太阳能充电时间等。结果表明,该设计具有通用性强、功耗低、充电快、通信可靠等特点,能够满足农业大田信息采集的应用要求。
Aiming at the requirements of sensor diversity, low power consumption, low cost and reliable communication in field applications, a wireless sensor network node is designed. Node to MSP430F1611 microcontroller as the core, Si4432 as a wireless communication module, the use of solar panels and rechargeable lithium battery complementary power supply to provide power. At the same time, the disturbance observation method was chosen as the solar power MPPT algorithm, and a periodic data sampling strategy was adopted and the data fusion method of the adjacent node data was selected. This paper tests and analyzes the node’s power consumption, communication distance and the relationship between packet loss rate and solar charging time. The results show that this design has the characteristics of strong versatility, low power consumption, fast charging and reliable communication, which can meet the application requirements of agricultural field information acquisition.