Research Of Information Acquisition System Based On Wireless Sensor

Acquisition of information is a prerequisite of implementation informationization.Sensors are an important instrument of information acquisition. Traditional sensor system based on RS232, RS485 cable and other ways to build communication links,fettered by cable, Can not simultaneously meet the low power, low price and high performance requirements,and unable to meet the people's pressing demands of location information. In this context, this article combines information acquisition system of agriculture in precision agriculture in the practical application, designed an information acquisition system based on wireless sensor.This system is mainly divided into the data center and sensor nodes in two parts. By analyzing and comparing several wireless technologies,it is determined that bluetooth is more suitable for wireless sensor networks. Bluetooth communications are the focus of this paper. Data center and sensor node via Bluetooth piconet composed of a wireless sensor network, detailed analysis of the traditional polling scheme and adaptive polling scheme, this project piconet scheduling scheme, a fit of this project piconet scheduling scheme was proposed, in addition, through the wireless sensor network positioning technology analysis,this system's positioning technology is GPS. Finally through the gap in the collection and transmission system to enter power-saving mode to reduce system power consumption.Hardware:sensor-side hardware system is based on S3C2410 processor, according to the need to expand the GPS module, bluetooth module, sensor module, to build into the system hardware platform;data center is equipped with Bluetooth hardware of the PC hardware machine.Software: sensor-side in the embedded linux platform, achieve a sensor and GPS data collection procedures, implementation of the Bluetooth communication procedures based on L2CAP protocol; Data Center has implemented the Bluetooth communication procedures , develop a user interface based on Qt graphics library, display and save information to database. After debugging the operation and functional testing, soil information system can achieve fast access and accurate positioning,implemented bluetooth communication between the sensor nodes and data center, results showed that the system is running a reliable, simple operation, easy installation, easy functionality expansion, accomplished the design requirements.