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.
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 RFID gate 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.
The overall software design of the access control system includes the software design of the lower computer reader and the software design of the database management system of the upper computer. The access control system of the access control system is mainly to realize the reading of the card and the communication with the host computer management system, and is implemented by C language programming in the Keil4 environment.
Through the physical test many times, the RFID access control system designed by this scheme is safe and reliable, and easy to use. And it has a high price/performance ratio compared to other access control systems. With the rapid development of the Internet of Things technology and the promotion of China's gold card project, it is believed that RFID technology will be increasingly applied to all walks of life.
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