Design of RFID access control system based on 51 microcontroller

In order to improve the effectiveness of access control system in terms of safety, security and management convenience, this paper designs an RFID access control system based on 51 microcontroller. The access control system in this paper uses the RC522 and S50 keycard as the core technology, combined with a rectangular keypad and fingerprint recognition system to achieve safe and reliable access control. By using the 51 microcontroller as a bridge to connect the input and output modules, it realizes the collaborative work between the modules to process and transmit the relevant data. The output adopts sound and light alarm module, LCD display and relay driver module to realize real-time monitoring and warning function. The system design not only has high efficiency, stability and strong security, but also has the flexibility of scalability and reliability, compared with the traditional access control system, more secure and convenient.