Greenhouse Environment Monitoring System Based On Solar Energy Driven WSN

With the rapid development of agriculture in China and the increasing demand for agricultural products,greenhouse planting technology is more and more widely used in agricultural production.At present,most greenhouse environment monitoring systems in China still rely on manual monitoring and wired monitoring,with shortcomings such as high cost,vulnerability to interference,and difficulties in later maintenance.Therefore,this paper combines energy harvesting technology and wireless sensor network(WSN)to design a greenhouse environment monitoring system based on solar-powered WSN,helping users achieve efficient management of greenhouse,which is important to promote the development of agricultural science and technology and the improvement of economic level.Firstly,this paper introduces the research status of wireless sensor network and photovoltaic power generation technology in detail,and designs the solar power module to power the nodes by analyzing the working principle and output characteristics of photovoltaic cells.When the sunlight is sufficient,photovoltaic cells directly supply power to the nodes;In case of insufficient illumination such as cloudy or overcast days,the joint power supply of photovoltaic cells and energy storage components is used to provide stable power for nodes.In order to make the photovoltaic cells continuously output at maximum power,this paper proposes a three-stage MPPT control strategy to achieve the maximum power point tracking of photovoltaic cells,ensuring the long-term and effective operation of the whole system.Based on the requirements of the greenhouse monitoring system,the temperature and humidity sensors,light intensity sensors,terminal monitoring nodes,routing nodes and coordinator nodes in the greenhouse environmental monitoring system are designed from the hardware and software levels.Finally,the feasibility of the system is verified through experiments on sensor nodes data collection,wireless sensor network communication,overall system functionality,energy collection performance and system performance.In this paper,the greenhouse environment monitoring system uses Zigbee wireless communication technology and solar energy collection technology.Sensor nodes do not need to frequently replace batteries.And the system software design uses a timed sleep and wake up mechanism,which largely extends the service life of the nodes and saves the cost of later maintenance.