Design And Implementation Of The Device Management Security System Using RFID

In recent years,RFID,as a kind of key technology of the Internet of things,attracted people's great attention,a lot of RFID products are appeared on the market,and they have brought great convenience for human life.Monitoring system designed by the RFID have an advantage of real time,ease of use,no dead angle,can bring better experience for users,and can be applied to some severe conditions.In fact,RFID technology has obtained many achievements,but the step for its key technology research has never stopped.In this paper,we designed a wireless monitoring system based on RFID to ensure the safety of valuable equipment.Firstly,it introduces the software,hardware platform and key technologies for develop RFID products,software platform is IAR EW,hardware include electronic tags and readers made by us,key technologies include I/O,UART,timer,DMA,Flash,etc.Secondly,it analyzed the function and feasibility of the whole system to determine each part of the key technologies required.Thirdly,we selected CC1110 as the core chip,and introduced how to design the hardware circuit and the device layout.Finally,implemented each part of the software function on the hardware development platform according to requirements of the system.The System's perception layer includes electronic tags used to send data,readers used to receive data,the data to be read and write has its own frame format,and finally introduced how to implement the bottom of all functions by C language,including register tag,loss recovery check,low battery warning,open or close the door,in or out the door,and other functions.These data is received by readers and then handled by readers,then transferred to the main controller by networks.The main controller's responsibility is parsing data frames,and communication with the server.Finally,the server will display the device's status in screen,people can use it easily.This kind of layered structure will be benefit for the administrators to manage,and reduce the maintenance cost in future.In addition,the article offers the key technologies in wireless communication and collision algorithm.By comparing the advantages and disadvantages of TDMA,FDMA and other algorithms,adopted CSMA as the collision algorithm to achieve multipoint wireless communication,at the same time,it also propose the theory of low-power in tags and CSMA protocol combination to improve the tags' useful time.Finally,measured the actual value of RSSI in different place and fitting the relationship between the RSSI and distance using Matlab,the relationship is the core equation to implement the positioning system.At the end of the article,also given other problems encountered in the development process and the solutions.