Research On ZigBee-Based Measurement And Control System Of Greenhouse Edible Fungus Growing Environment

Shiitake mushrooms, oyste mushroom and ganoderma lucidum and other edible fungi, its nutritional value is rich, is enjoyed by all levels of the consumer and have a very considerable economic value. However, edible fungi microorganisms are very strict on the growth environment, Traditional agricultural greenhouses often use wire communication technology for measurement and control of its growth environment, but most of them are only a single environmental parameter measurement and control, so their intelligence and automation degree is not high, this has severely restricted the yield and quality improvement. In addition, the methods has some shortages, such as communication cables laid is more complex, wires easy to aging, low reliability and maintenance difficulty and the cost is higher, making it difficult to popularize and apply in the greenhouse agricultural production.ZigBee wireless communication technology because the stationing of construction with simple, is easy to build network, and low power consumption and cost, so widely used in the field of transport logistics, property, environmental monitoring, etc.On the base of literature review, investigating the production base of edible fungus greenhouse, deeply analyzing the demand of the practical production, and finishing some experiments and tests, a ZigBee-based design scheme of supervisory control system for greenhouse is provided in this paper. That is, The whole system including terminal sensor nodes(such as temperature, humidity, illumination,CO2 and etc.), terminal control nodes, routing nodes, gateway nodes and supervisory control system. At first, a ZigBee-based hardware platform of measuring and control system for edible fungus greenhouses is designed. The coordinator and gateway are integrated together in the hardware platform, for the next layer, they are responsible for the work that is to build a network and manage all equipments in sensor networks; and facing to upper layer, They are responsible for the communication with the monitoring software system, The sensor node is responsible for collecting the environment parameter, The controller node is responsible for executing control instruction, the router is responsible for the communication network routing. According to the functional requirements of each node, the CC2530F256 chip is selected as the core processor of ZigBee module, the DHT11 module chosen as temperature and humidity sensor, etc. The hardware of each node are made from substrate that made of basic functional modules and ZigBee basic unit module board. Secondly, on the basis of the hardware design and the Z-stack protocol stack, according to the functional requirement, the program is designed for sensing terminal nodes respectively, control terminal nodes, routing nodes, and gateway (coordinator) program is designed. Folowing, referencing to the resources and the enterprise research and the actual production needs, using Visual Studio as development tool and PC monitoring software system is developed, real-time display greenhouse environmental parameters and the running status of equipment and automatic control, and other functions can be realized. Finally, the related modules of the system are tested. The results show that not only build ZigBee network, collect data, but also computer monitor, the whole system running normally.