Research On The Monitoring System Of Sunlight Greenhouse Environment Based On ZigBee Technology

Solar greenhouse is a kind of endemic greenhouse types in northern China. Compared with traditional types of greenhouse, it can make use of sunlight to heat and provide light to crops, so that the solar greenhouse is widely used in north of China. However, there are many disadvantages in the monitoring process that is used to monitor the environment in the solar greenhouse with its development and popularization of precision agriculture. The traditional methods of manual measurement cause lots of inconvenience to staffs. Those methods not only increase the workload but also could not reflect of the environment in solar greenhouse. What’s more, traditional measuring instruments can’t accurately measure the value of each parameter. Considering the above problems, establishing a set of simple, high precision, full-featured, secure and strong solar greenhouse monitoring system has a practical significance.The solar greenhouse monitoring system proposed in this article timely adjusts temperature, humidity, concentrations of carbon dioxide, light intensity and other environmental parameters to meet the crop’s production needs. This system combines the Zigbee wireless sensor network technology, single chip microcomputer controlling technology and embedded configuration environment development technology to acquire control parameters which further control exhaust fans, ventilation fans, water boiler, electric blinds, artificial light, carbon dioxide generators, micro nozzle and other hardware equipment to start or stop with sensors collecting environmental data.The host and slave computers with software and hardware are designed in the solar greenhouse monitoring system. The hardware design includes the perception module, wireless processing module, relays, control panel selection, the power supply system and anti-jamming design. These equipment constitute the solar greenhouse monitoring system hardware platform. Slave computer software includes the design and implementation of the embedded development system and the fuzzy PID algorithm. Using nesC language, the gateway node, CSMA/CA algorithm and the listener control strategies are well designed with TinyOS platform. In addition, the fuzzy PID algorithm is simulated under the MATLAB environment. This system’s host computer is divided into two parts: the remote monitoring computer and the onsite solar greenhouse monitoring screens, which are developed by MCGS generic and embedded version respectively. Also, the design of work interface, system settings and work-logs user interface are completed.By testing the mentioned monitoring system several times, experiments show that: the system can be timely and accurate monitoring the changes of various environmental parameters in greenhouse.Testing results are stable and errors are within a reasonable range. Various kinds of controlling devices can also work normally and realizing the manual and automatic dual control. The host computer is stable for users to watch the scene, control hardware devices, adjust system parameters and check historical data. The wireless sensor network signal is also stable. It can work normally in less than 350 meters. This system ensures that crops in the solar greenhouse are under a reasonable environment and free from outside influence with satisfied growth results. It works securely and has a practical significance.