Design Of Greenhouse Environment Monitoring System Based On Wireless Sensor Network

China has been a country that values agriculture since ancient times,and the proportion of farmers is very high.With the rapid development of modern science and technology,the content of science and technology in agriculture is also increasingly apparent.The country knows that only relying on modern planting techniques can change the status quo of food in a real sense,thereby improve grain production and make the country rich and the people strong.Greenhouse is an important agricultural product breeding base in China,which mainly provides suitable growth environment for crops.At present,China's greenhouse management technology has low technological content.It mainly relies on manpower and planting experience for management and control,which is time-consuming and laborious.In response to these problems,this paper designs a greenhouse monitoring system based on wireless sensor network.The main research work is as follows:1)The system uses the wireless sensor network as the communication foundation,ZigBee technology is the communication means,to complete the design of the lower computer and the host computer.The lower computer is mainly composed of three types of network nodes: terminal,router and coordinator.It completes the collection,control,display and abnormal alarms of temperature,humidity,smoke and light intensity information,and transmits them to the host computer.The host computer uses Visual Studio 2015 to write a human-computer interaction interface,which can record the real-time information of the environment and perform regulation and alarm warning when the data is abnormal.2)Based on the principle of low power consumption and high integration,select the main control chip,various sensors and other chips,and to complete the hardware design for the endpoint,router node,and coordinator nodes.The software part is based on the Z-Stack protocol stack,and the program is written by the IAR development environment,which greatly improves the software design efficiency.Aiming at the control accuracy of temperature and humidity,a variable-domain fuzzy PID control algorithm is proposed,and the expansion factor is introduced to indirectly increase the fuzzy control rules.Compared with the traditional control algorithm simulation,it is proved to be superior in response speed,overshoot and stability.3)Build a system test platform.Tested from the overall performance,packet loss rate and data accuracy of the system,the test proves that the system communication quality is good and the work is stable.It can realize real-time monitoring of environmental data in greenhouses,meet the design requirements of low power consumption and high precision,and has good practical significance.