Design And Implementation Of Low-power Data Acquisition System Based On ZigBee

With the development of society, real-time monitoring of the environment information is required in many occasion. Traditional wired monitoring network has wiring troubles, high power consumption, and high cost. With the combination of wireless technology and sensor technology, wireless sensor networks have become effective solutions to such problems. By studying the wireless technology of ZigBee, this paper designs a low-power data acquisition and transmission system based on ZigBee. The system combines the embedded technology, sensor technology and wireless communication technology. And it is able to acquire and transmit the environment information such as temperature, humidity, smog, human infrared stably for a long time.The paper firstly introduces the background and the present research status of Wireless sensor networks and ZigBee at home and abroad. Secondly, the paper introduces the development, architecture, features, applications of wireless sensor networks and ZigBee wireless networking technology. Thirdly, the paper analyzes the overall design of the system, and the node is divided into several functional modules. It also selects the appropriate chip and describes design ideas of the low-power node. The paper chooses TI’s CC2530 which is widely used for 2.4GHz SoC solutions. Then it focuses on the design of hardware and software of ZigBee wireless node. I choose Protel99 SE to design the hardware and it mainly includes ZigBee wireless communication modules, data acquisition modules, power modules, debugging module and so on. Hardware is divided into core board and backplane. The main function of the core board is to send and receive wireless signals and the backplane provides sensor interface, serial communication interface, debug interface, power supply circuits, etc. The paper chooses IAR Embedded Workbench as development environment of the software and transplants TI’s Z-Stack protocol stack. Then the code is written on its application layer for coordinator, router and terminal node in order to reduce development effort and shorten the development cycle. Finally, the data acquisition system is built and tested, and it focuses on the energy consumption of the terminal node. Then the system operating results are gained to prove its availability and low power of the system.