一种基于无线传感器网络的兔舍环境信息采集节点设计

Design of Energy Self-sufficient Wireless Sensor Network Node for Orchard Information Acquisition

本文设计了一款适合兔舍环境信息采集的无线传感器网络(wireless sensor network,WS N)节点。节点以MSP430F149为核心,nRF905作为无线射频通信芯片,ME4-NH3氨气浓度传感器、DHT22空气温、湿度传感器及其外围电路作为传感器模块,并以该硬件平台为基础编写了通信协议和节点应用程序。测试节点在空旷环境下通信距离为198m,节点休眠电流仅为2.50μA。在广东省云浮县骏威种兔养殖基地进行了组网试验,结果表明:网络丢包率为1.37%,能够满足兔舍氨气浓度信息采集的应用要求。

A wireless sensor network （WSN） node was developed for rabbit house information acquisition. The node uses a MSP430F149 as the core, a nRF905 was used as RF wireless communication chip, DHT22 air temperature and humidity sensor and ME4-NH3 ammonia concentration sensor and their peripheral circuits were used as a sensor module. Power consumption and communication distance of the node were tested and analyzed, the current cost of the node in sleep mode was 2.50μA, and the maximum effective communication distance of the designed nodes reached 198m in unoccupied regions. A WSN was established for measuring temperature, humidity and ammonia concentration of rabbit house in Junwei rabbit breeding base. Experimental results showed that the network packet loss rate is 1.37%. Combined with of the results above, the designed node has the characteristics of long life circle, low power consumption, and stability transmission, etc. It is suitable for and could meet the needs of information acquisition in rabbit house.