基于RFID的门禁系统

Access Control System Based On RFIDAbstract:This article mainly introduces the basic background and design method of the accesscontrol system.The access control system mainly includes six parts:key lock,RFIDradio frequency module,STC89C52 microcontroller,Matrix keyboard,1602 LCDdisplay,power supply and so on.The system software is mainly composed of 1602LCD display program,RFID radio frequency program and keyboard scanningprogram.The community RFID access control management system is based on the 51single-chip microcomputer system,plus 12864 LCD screen,RFID radio frequencymodule and host computer and other main devices.It has achieved the function ofreading related information from the host computer screen by swiping from the lowercomputer.Among them,STC89C52 as the "brain"of the system,it is the maincontroller,the role is to achieve the collection of radio frequency signals intocomputer data,and then transmitted through the serial port,the data is transmitted tothe computer and then through the screen to display related information.In thisprocess,the host computer needs to call the database data for comparison.If the dataof the lower computer matches the data in the database,it will send instructions to thelower computer at the same time.At this time,the access control system will beopened immediately,and the upper computer will call the database.Personalinformation is displayed on the screen,the user will be stored in the database by thehost computer every time the user swipes the card,and the administrator can querythe relevant information at any time.If there is no matching information,the alarmwill be displayed and the alarm will be prompted by the lower computer buzzer.Keywords:STC89C52 single chip microcomputer;gating device;RFID;hostcomputer