摘要
提出一种基于单片机SN8P2201和EM4095的USB接口ID读卡器的设计方案。该设计方案结合单片机硬件和曼彻斯特码编码特点,利用计算曼彻斯特码的下降沿间隔的载波数的方法进行解码,提高解码速度和准确度。USB模拟键盘输出,无需上位机。读卡器的读卡的距离达5 cm,该设计方案特别适用于网吧管理、考勤机等,运行稳定,应用前景广阔。
In this paper,the design of USB interface ID card reader based on SNSP2201 and EM4095 is presented. Combing the features of microcomputer and Manchester code ,the design uses the means of counting carrier between the failing edge intervals in Manchester to decodes.It improves the decoding speed and accuracy.USB simulates output of the keyboard without PC software.The distance between the card reader and card reaches five centimeters.This design is especially suitable for internet management and attendance machine and so on,and the design has operational stability and broad application prospects.
出处
《电子设计工程》
2009年第11期24-26,共3页
Electronic Design Engineering
