基于PLC、无线传感器网络和3G的温室智能化控制

Precison Agriculture plays a key role in agricultural engineering. With the development of information technology, many new concepts like advanced sensing technology, GPS, GIS will be added into the application of Procision Agriculture. Wirelss sensor network now becomes a hot topic in many fields like Civil Engineering, Agricultral Enginnering and Biomedical Engineering. Greenhouse has many controlable factors and is the ideal place for applying wireless sensor network. An intelligent monitoring and controlling system was designed and developed to collect data from the greenhouse environment and then trasmit to the greenhouse server for analyzing and controlling. Jennic 5139 was chosen as the ZigBee node and Simens s7-200 as the PLC module.The sensors monitored humiduty and temperature of the greenhouse. The packet of data were transmitted through wirelss sensor network and sent to the coodinator node. Then the data were inputted into the coodinator node which integrated with PLC and 3G module. The coordinator node sent these data to the greenhouse server via 3G module, meanwhile it analyzed these data and gave signal to PLC to control the corresponding devices. And at the greenhouse server side, based on data analyzing, the server gave the corresponding instructions to the PLC via 3G and ZigBee coordinator to carry out the device controlling. In this way, the automatic control and artificial control were realized. The test showed that the intelligent control was achieved by using the integreted control module of the greenhouse.