Automation, information and intelligence have become the needs of the development of the times. Since the beginning of the 21st century, unlimited technology and computer technology have continued to develop in depth, and the Internet of Things industry is booming. The access control system based on RFID technology is a good embodiment of the practicality of the Internet of Things. The access control system can be divided into the following three categories according to the access identification method: password recognition; card recognition; biometric identification. Password identification means that the entry and exit rights are recognized by checking whether the input password is correct. The password identification security is relatively high, but the password is easy to forget, and it is cumbersome to enter the password every time you enter the door. Biometric identification is recognized by some biological characteristics of human beings. Biometric identification is high and very convenient, but its high cost makes it difficult to promote. Card recognition is divided into two categories: the first one is a magnetic card, but the magnetic card is low in security, easy to wear and requires frequent magnetization; the second is an RFID card, which is cheap, easy to use, highly secure and can use a database. It is well managed, its cost performance is extremely high, and it has a good promotion prospect.
In summary, this paper introduces an access control system based on RFID technology, which is low in cost and high in security. Ability to view information about the access control system in real time.
1 overall structure and working principle
The overall structure of the system consists of two parts: the upper computer server management system and the lower computer card reader. The lower computer card reader mainly consists of power supply, main controller, liquid crystal display, card reader module, antenna and serial communication. The M102GPCV3 reader card module uses 13.56MHz non-contact RF technology and can read MifareOneS50, S70, FM11RF08 and compatible cards. The LCD displays some tips and time and date. The serial port is used for communication between the lower computer and the upper computer server. The upper computer server management system uses the database MySQL database management, and the specific management interface is displayed in the form of a web page.
The working principle of the whole access control system is: one person and one card, and establish corresponding personal information in the database management system according to the serial number of the card. When the door is to be opened, the card is brushed on the lower computer, and the lower computer reader transmits the serial number to the upper computer server. The server queries the corresponding personal information in the database according to the serial number and transmits it to the lower computer. At the same time, the lower computer reads the data of the fixed sector block of the card (reading the card), compares the read data with the data sent by the upper computer, and opens the door exactly the same, otherwise the LCD displays an error and does not open the door. All the above information will be uploaded to the upper computer management system for storage. The host computer management system can change the data information (write card) set by the lower computer.
2 system hardware design
2.1 hardware overall design
The main controller of the access control system is the ARM-STM32F103VET6 chip of Codex-M3 core. The main frequency is 72MHz, the on-chip 512KBFLASH, and multiple USART controllers are built in, which are used for RFID read/write module connection and host computer communication. The read/write module uses the M102GPCV3 module and operates at 13.56 MHz. as shown in picture 2. The main control board is debugged and downloaded by the JTAG port. The LM117 provides 3.3V and 5V voltages for the system board. The I/O port is connected to the 12864 liquid crystal for displaying related prompt information and time and date. The USART1 is connected to the card reader module for reading card information, and the USART2 is connected to the MAX232 for communication with the host computer.
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