Design Of Fruiter Irrigation System Based On Wireless Sensor Networks

High-yield crops is significant for economic development of China, whichis a large agricultural country. Meanwhile, China is also has a problem of unevendistribution of water resources, water is wasted a lot in traditional irrigationmethods. Water-saving irrigation system is controlled based on soil moistureinformation, the efficiency of irrigation water is improved and the contradictionof water shortage is relieved. The main work of this paper is summarized asfollows.(1)A irrigation system based on wireless sensor networks is proposed.According to soil moisture, irrigation system was controlled by PC. The systemis composed of three parts, they are sensor nodes, wireless gateway and PC.Sensor nodes are made up of soil moisture sensors and ZigBee modules.Wireless gateway is composed of ZigBee module, GPRS module, micro-controller and valve. The soil moisture information is received by PC, thencommands are made based on soil moisture information.(2)ZigBee technology and GPRS networks are used in this system, ZigBeewireless communication is applied between sensor nodes and wireless gateway,GPRS communication is used between the wireless gateway and PC. Thesoftware design of sensor nodes and wireless gateway are completed. Thesoftware of sensor nodes are composed of two parts, the collection of soilmoisture information and the design of ZigBee data transmission function. Thedesign of ZigBee communication program is based on TI’s Z-Stack. Thesoftware of wireless gateway are composed of the creation of ZigBee networkand the design of GPRS driver.(3)Based on the actual needs of the system, an improved LEACH(LowEnergy Adaptive Clustering Hierarchy) routing protocol is proposed. Clusterhead selection mechanism added energy control conditions, the possibility of energetic sensor node is selected to become the cluster head increases.,Periodicdata collection is added,soil moisture information is regularly sent to the PC. Atthe same time, multi-hop communication is applied between cluster heads andwireless gateway. To reduce the amount of data transmission, data processing isapplied.(4)Visual Basic6.0is used to complete system monitoring software design,Microsoft Access is selected as the database of the system. The systemmonitoring software is composed of two interfaces, soil moisture informationcan be monitored in real-time, historical soil moisture information can be saw indata report, and irrigation command can be sent by PC.ZigBee communication between different modules, ZigBee and GPRSpacket error rate of communication and the entire system are tested based onserial debugging assistant. Test results show that the communication betweenZigBee modules is normally, the packet error rate of the system is small. Thecollection and transmission of soil moisture information, and the control of valvecan be achieved by this system.