Design And Implementation Of Information Collection And Sharing Terminal For Large-Scale Instruments Based On Digital Campus

Currently,the large-scale instruments in university of our country have few means to be superviced,and it’s hard to verify the users’identity.Besides,time records is not accurary and real running data of the instrument can’t be acquired. According to actual demand of South East University,this research design a information collection and sharing terminal for large-scale instruments based on digital campus platform,used the NUC951 as the core MPU and embeded linux as the operating system.This terminal aimed at collecting actual experiment data,recording running information of instrument objectively,supervising and managing in real time,and providing real and effective essential data for decision-making level.Based on the user data of digital campus and RFID technology,this paper realized logging the system with campus card.Communication protocol between RF module and the processor supports cards finding,anti-collision and beep.The Mifare series chips are compatible of the RF module.Besides,user permission system based on GDBM database stored the exact records of using and booking of different users.This paper designed private communication protocol between the server and client based on the socket of TCP/IP,which supports the collection and sharing of various information.Meanwhile,applications security update by net is proposed based on in application programing and file verification technology.We designed the piecewise protocol,used the CRC to verify the correctness of the applications and redundancy mechanism to keep security update.In this way,update problem can be completely solved.Based on the drivers of GPIO,SPI,the power control and current detection function are developed.Also,with the Video For Linux Two API,the USB image acquision and upload function are implemented.Forcing on the key data,we design the data disaster recovery system to ensure the reliability of data.In addition,based on DGUS touch screen we design human-computer interaction system and show different users with different interfaces and information.Presently, the system has been successfully applied to the precise instruments sharing platform of Southeast University and running in good condition. The key functions of the system have been tested on the experiment platform and the stability of the system has been verified.