基于PIC18F4550的USB接口读卡器的设计

contactless smart IC card reader with USB interface based on the single-chip PIC18F4550 has been designed in this paper. The reader receives commands to perform the corresponding action, and returns the results to PC.The paper introduces the composition of the reader system and the design of the hardware circuit, and prepares the firmware and PC dynamic-link library (DLL) and the demonstration. The reader using USB interface power supply, with PIC18F4550 microcontroller as the core, has 12Mb / s full-speed transmission to PC, which overcomes the traditional reader’s disadvantage such as power consumption, low reading and writing speed and poor stability. The reader uses MFRC531, meanwhile it has a SAM card module to enhance data transmission security. The reader designed in the article has low power consumption, strong anti-interference ability, long reading distance and fast speed to read and write, and it can be used in public transport, attendance and other systems.