Development Of Multi Parameter Greenhouse Monitoring System Based On ZigBee Wireless Network

The greenhouse is a decisive position in facility agriculture. How to monitor the environmental parameters of the greenhouse in real time, has become the focus of more intelligent and more efficient part of it.Nowadays, with the rapid increase of automation, wireless communications, sensors and other sophisticated technology, the traditional greenhouse unable to meet agricultural high quality high yield of demand. Wired data communication method is the mainstream of Intelligent Greenhouse in the past, with the rapid development of wireless sensor network, the application of information collection and monitoring in the greenhouse has been the concern of researchers. This can make crops do not need to be subject to weather, geographical constraints, the year round are in the best environment to grow. Therefore, intelligent greenhouse will become the main direction of the future development of agriculture, one of the most promising industries.Firstly the Bluetooth, WiFi, UWB, NFC and ZigBee five commonly used wireless communication were compared and establishment of ZigBee wireless communication, because it has a simple structure, low cost, low energy consumption, self- organization, accommodate nodes, etc., these are very suitable for the system. Then, the protocol stack, network topology and OSAL system are analyzed deeply, and then the overall scheme of the system is designed according to the design requirements of the system.The hardware design in accordance with the order from the collection, transmission and display of the order, first of all to the temperature sensor, humidity sensor and light intensity sensor design, chip were selected the DS18B20, SHT11, bh1750 fvi. Communication chip select CC2530 as the core chip, to be CC2591 for RF power amplification, so that data transmission is farther, a wider range. Then the function module is designed, including the RS232 serial port module, 3.3V and 5V two power modules and JTAG module design.The software design of the article first analyzes the ZigBee protocol stack and OSAL system, and the software design of wireless communication on the basis of the two. In the software design of the coordinator node and the terminal node, the energy saving routing algorithm is carried out because of the battery power supply of the ZigBee terminal node. The host computer uses the QML script as well as the API Windows' s call to carry on the design. Through the construction of the system experimental platform, the design of the system has been verified to meet the greenhouse monitoring requirements, making the data in the host computer display in real time.