Greenhouse Wireless Sensor Network Environment Monitoring System Base On ZigBee Technology

The modern greenhouse is facilities agriculture production workshop. Greenhouse environmental information monitoring system is the key processes to realize automatization and high efficiency production.At present, greenhouse monitoring system adopts the way of cable net. Some artificial measure method is adopted, These ways can lead to system hard to assembly, measurement accuracy is poor, low working efficiency, Not only increase the net system of electrical engineering construction cost, also cause difficulty with watering fertilizer, etc.In addition, the traditional system monitory point don’t have self-organization function and self-healing ability, high maintenance costs, heavy work to maintain, is bad for system upgrade. Wireless sensor network (WSN) is a kind of new information acquisition technology and processing technology, characteristic is large scale,small volume, low cost, ad-hoc network, etc, Have broad application prospects in the greenhouse environmental monitoring field. ZigBee technology is a kind of emerging wireless networking technology.characteristic is communication closer, low protocol complexity, have the ability of self-organization, low power consumption, low transfer rate and low cost,can be used as a networking protocol of greenhouse wireless sensor network monitoring system.This paper developed the greenhouse wireless densor network monitoring environment system base on ZigBee technology.First, introduced this system needed to achieve the basic functions. According to these requirements, to design the overall structure of the whole system, And introduce the choice of topology.Set up seven sensor nodes to satisfy the measurement requirements. Set a coordinator node to satisfy the wireless communication and accept the data. Sensor nodes measured data, and then the data sent to the coordinator node in real time. The coordinator node to transmit the data to the GPRS module, the data center through the INTERNET to receive data, in the end in the data center for data processing. Choose the star topology. After that, research and design the hardware part of the system,including the sensor node, the coordinator node and GPRS module. In the part of sensor node hardware design, including the delivery of the data processing module, sensor module and power module. Chose CC2530chip as the main chip of data processing module, choose seven sensors to satisfy the measurement requirements of the system. Including air temperature and humidity sensor, soil temperature and humidity sensor, water temperature sensor, light sensor, CO2sensor, pH sensor and EC sensor. Three power supply modes is designed.In the coordinator node hardware design, including the data processing module, serial port module and power module. Chose SN65C3243logic control chip as the main chip of serial port module.The other two parts same as the sensor node. Use of GPRS wireless data terminal F2103IP MODEM as GPRS transmission module of the system.Then, write the sensor node program, the coordinator node program and client program. Sensor node program mainly includes seven kinds of sensor measurement program and send data program. The coordinator node program is a serial port program and data reception program.Finally, carries on the field of networking and run in the greenhouse. Temperature measurement accuracy is plus or minus0.2degrees Celsius, humidity is plus or minus3.0%.Comply with the design requirements.