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基于物联网的温室基质电导率实时监测系统开发

发表时间:2011-10-15  浏览量:1338  下载量:579
全部作者: 李翱,王琢,李民赞
作者单位: 中国农业大学现代精细农业系统集成研究教育部重点实验室
摘 要: 为实现对温室基质电导率的实时监测,开发了一套基于物联网技术的温室基质电导率实时监测系统。该系统通过协调器接收温室中多个传感器节点采集的数据,通过通用分组无线业务(general packet radio service,GPRS)网络连接互联网传输到服务器。传感器节点采用电流电压四端法,恒流源产生一个正弦波的恒定电流并通过电极输入到土壤中,信号调理电路可以测量电极端的电压并转换为直流电压,最后通过ZigBee无线通信模块发送到协调器。协调器部分加入MC55GPRS模块,利用JN5139无线微控器的串口1与MC55通信,控制MC55将数据通过GPRS网络传输到互联网。服务器端在Visual Studio 2008平台下利用C#语言开发服务器端软件。该软件能够监听指定的IP端口、接收TCP连接、接收GPRS模块发来的数据并存储到数据库,同时还提供数据报表浏览与折线图浏览的功能供用户观察数据。整体测试结果表明:该系统能够稳定准确地采集发送接收数据,并可适应长时间地持续监测。
关 键 词: 农业电气化与自动化;物联网;无线传感器网络;温室基质;电导率;精细农业
Title: Real time monitoring system of greenhouse substrate electrical conductivity based on the Internet of Things
Author: LI Ao, WANG Zhuo, LI Minzan
Organization: Key Laboratory of Modern Precision Agriculture System Integration Research, Ministry of Education, China Agricultural University
Abstract: In order to monitor greenhouse substrate electrical conductivity (EC), the Internet of Things was adopted to develop a real time monitoring system. The system consisted of one coordinator and several sensor nodes. The four-electrode method was introduced to measure the EC. A constant current source, generated by excitation source circuit, was inserted into soil by the lateral electrodes. And then the voltage between medial electrodes was detected and processed by the signal processing circuit. The result would be sent to the coordinator by ZigBee wireless module. MC55GPRS module was added to the coordinator, connected by UART1 of JN5139. Data could be transmitted to the internet by GPRS. Then, server software was developed by C# to receive the data from GPRS. The function to observe data was also designed in the software. A test was conducted to the system. It showed that the system could collect, transmit and receive data stably. The system was suitable for long time monitoring.
Key words: greenhouse substrate; electrical conductivity; precision agriculture
发表期数: 2011年10月第19期
引用格式: 李翱,王琢,李民赞. 基于物联网的温室基质电导率实时监测系统开发[J]. 中国科技论文在线精品论文,2011,4(19):1761-1766.
 
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