| With the rapid development of computer technology and wireless communication technology, information technology has become an important standard to measure the modernization level and the comprehensive national strength of a country. China is a large agricultural country, and agricultural modernization has become one of the important strategic objectives of the socialist modernization construction. In recent years, with the continuous development of protected cultivation, greenhouse area was increasing rapidly. So using the wireless sensor network technology on the greenhouse temperature precise monitoring has an important practical significance on improving the level of crop production and yield.In recent years, the greenhouse temperature monitoring methods were usually based on Zig Bee wireless networking technology. This method was unreliable in remote networking, and its monitoring data was inaccurate. To solve the above problems, this paper used the temperature sensor, RFID technology and wireless network temperature to transmit and acquire data, and studied a greenhouse temperature monitoring method of segmentation RFID network which was based on double random addressing. This new method could not only improve the addressing reliability, but also guarantee the accuracy of monitoring data accuracy. The main works in this paper are as follows:1. The greenhouse temperature monitoring was based on the method of double random addressing RFID network segmentation. This paper analyzed the traditional greenhouse temperature monitoring network methods and the faults of networking method of Zig Bee wireless communication network nodes, then studied a double random addressing RFID network segmentation method. The system of all the active nodes were arranged by the address codes and were accurately located by the method of double random addressing, then divided the system nodes into multiple units by the networking segmentation. At last, this paper improved the signal accuracy.2. The overall design and hardware selection of the greenhouse temperature monitoring were completed. This paper designed the program of greenhouse temperature monitoring and completed the selection of hardware device. On the basis of this program, through using MSP430F149 MCU as the processor, using n RF905 as the Wireless Transceiver RF module, and using DS18B20 as the temperature sensor, this paper completed the circuit design of nodes.3. According to the overall design and hardware design of the devices, this paper completed the software design of the nodes. The paper introduced the process of the data receiving and data transmission in wireless communication, and designed the program flow chart of the micro control unit node’ software, sensor nodes’ software and PC software. The software realized the communication between nodes, the micro control node and PC, in the meanwhile, reduced the power consumption of node.4. The paper analyzed and compared the experimental results of random addressing RFID network segmentation method and traditional networking method. The paper introduced the system diagram and addressed the detailed design process diagram of experimental design, and analyzed the experimental results to explain the superiority of the segmentation of RFID network based on double random addressing.Through the test of temperature monitoring system, the results showed that in the long-distance monitoring, the accuracy of experimental data of the method which was based on this paper has been improved than that of traditional networking method. This method has a certain guiding significance on large area of greenhouse temperature monitoring. |
