Hardware Design Of A Wireless Motion Data Acquisition System

Much more advanced technologies are applied to physical trainings and games with the development of science and technology in our country. An increasing number of people are concerned about the limit of human locomotion. Our country has attached the importance to the application of advanced science and technology in athletic sports. Up to now, sports are closely related to science and technology. The relation of sports and advanced science and technology has to be more closely as the world'science and technology has closed to the high-tech field and the rapid progress of athletic sports. Developing sports through science and technology has become a new fashion.Wireless motion data acquisition system is a new type of design about motion data collection. This system includes a host server (computer), a collector and no more than sixteen terminals. Collecting the three-axis acceleration data and the three-axis yaw rate data, a terminal send them to the host server through the collector. The collector communicates with the host server through the RS-232. The software which has been developed in computer real-timely displays the relevant technical information on the screen which the terminal collected, and the software has also save and replay function, so it can provide a supplement analysis for the relevant professionals.The heart of a terminal and the collector is a highly integrated, multi-functional wireless transceiver nRF24E1. The terminal acquires three-axis yaw data by the fixed-point TMS320F2808, the member of the TM320C28XTM DSP generation which is highly integrated, high-performance and multi-functional. The three-axis acceleration adopts a MMA7330L chip which is a three-axis acceleration sensor sand gyroscope uses three ADXRS300 chips, each of which is single yaw rate sensor. Both schematic and PCB are designed by Altium Designer 6.9, as well as the power circuit. A star-network communication protocol is established in this paper, which can avoid conflict when no more than fifteen models are functioning. The firmware is designed in Keil C integrated development environment and the other DSP is designed under CCS3.3development environment. After finished, the model can gain the three-axis acceleration and three-angle information and then transmit them to the PC through the collector. Studying motion data acquisition and signal transmission has a good academic value and prospects. The system can also be applied to general situations requiring wireless data collection.