| China is rich of fresh water resource, but its per capita rate share is very low and it is one of the countries that are most lack of per capita fresh water share all over the world. Fresh water used for agriculture supply about80%of the total, but water utilization rate of agriculture irrigation is very low. Therefore, the development of water saving irrigation technology is of great significance. With the development of automation and intelligent water saving irrigation systems, scientific and rational management of irrigation, not only can save manpower and resources, improve labor productivity, but also to deal with water shortages and the inevitable choice of promoting agricultural modernization. The emergence of wireless sensor networks (WSN) has become entirely new path for large-scale information collection. And ZigBee is the most widely used protocol in WSN, which has the characteristics of low cost, low power consumption and high reliability. Moreover, GPRS technology has these advantages of covering wide range, fast data transmission speed, high communication quality, always online and charged according to the flow, which makes wireless long distance remote monitoring simple and reliable. This study aims at the flaws in traditional agricultural monitoring system, using ZigBee and GPRS technology to design a remote intelligent greenhouse irrigation system, and designed a fuzzy control strategy to irrigate greenhouse tomato timely and appropriately. The main contents of this paper are as follows:(1) Analyzes of ZigBee and GPRS technology application and development situation at home and abroad, and introduces the research status of intelligent irrigation technology, finally explains research content of this study.(2) Analyzes advantage and suitability of this system of ZigBee and GPRS technology, and puts forward the general framework of the whole system.(3) Introduces each node of the exiting on-site monitoring system, and focuses on the hardware design and deployment of the inverter control module that was adapt to the new needs, and the appropriate quarantine measures to ensure the reliability of the system.(4) Design and implementation of remote monitoring center software, including processing data from the site gateway node, data analysis and remote control. The software includes two parts:the WinForm program and a ASP.NET website. Takes a test of this system and founded that to establish a connection of GPRS on-site and remote monitoring center takes about1minute average delay, and the control of valves on-site process takes about4s, which meets the needs of the actual use.(5) Research and implement of a tomato intelligent irrigation module based on fuzzy inference. It is located in remote monitoring center which input contains soil moisture and soil moisture change rate, output is irrigation time, and could irrigate timely and adequately based on tomato growth period appropriate soil humidity. After this module designed, take simulation and corresponding simulation experiment, which shows that it can irrigate according to soil moisture in a moderate amount. |
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