| Greenhouses in China’s middle and high latitudes have the problem of insufficient light in winter and spring,resulting in limited photosynthesis and poor crop growth.At the same time,the cost of environmental control in greenhouses is high,which also limits the promotion and application of automation technology.In view of the above problems,this project uses modern electronic design and embedded system technology to develop a practical greenhouse environment measurement and control system for photosynthetic rate regulation,the core of which is photosynthetic rate-oriented fill light control technology,and experimental deployment.The research results are conducive to low-cost,practical and scientific environmental regulation in ordinary greenhouses,and achieve cost saving and income increase.Key efforts and results include:1.The environmental data collection and summary of greenhouse with multi node and multi parameter were carried out.Through the development of multiple monitoring and control sub nodes,which are distributed at multiple points in the greenhouse,the temperature,humidity,CO2 concentration,light intensity,and photosynthetically active radiation values within the range of nodes are collected using the multi parameter integrated sensor,light intensity sensor,and photosynthetically active radiation sensor within the nodes,And through wireless communication modules,a local data network is constructed to gather data from multiple nodes into the developed monitoring and control master node.2.We have developed a high-power plant fill light and achieved fixed point and quantitative fill light for crops based on a photosynthetic rate model and PID control algorithm.Each monitoring and control sub node includes an independently developed highpower plant fill light.The fill target values of each sub node are calculated through the photosynthetic rate model running in the main monitoring and control node,and combined with the built-in PID control algorithm of each sub node to achieve quantitative fill light for crop fixed points.3.We have carried out system integration and production,and deployed it in a small greenhouse.After testing,the functionality and performance are good.A certain performance test has been conducted on the PID control algorithm and the power of the fill light.The test results show that the PID control algorithm can effectively complete the fill light control function,and the power output of the fill light meets the requirements for filling light on crops. |
