This design of the plate of the access control system is mainly card reading module, SCM control module, stepping motor circuit, infrared sensor module, storage module, timer, buzzer prompt circuit, display circuit. The high-frequency card reader module FM1702Sl can read and write the Mifare non-contact RFID card from Philips of the Netherlands, with a reading distance of about 10cm. The control module adopts STC89C52RC SCM, which has 8K programmable Flash memory. The communication between MCU and card reader is SPI communication. The hardware main block diagram is shown as follows: