毕业设计论文--基于单片机控制的射频ID卡考勤机的设计（终稿）.doc

基于单片机控制的射频ID卡 考勤机的设计 Design of Radio Frequency ID Cards Attendance Based on Single-chip 摘 要 射频识别技术是一项利用射频信号通过空间耦合(交变磁场或电磁场)实现无接触信息传递并通过所传递的信息达到识别目的的技术。射频识别是非接触式的自动识别，它通过射频信号自动识别目标对象并获取相关数据，识别工作无须人工干预，可工作于各种恶劣环境。技术中标签与读写器通过无线射频信号交换信息与条形码技术相比，可以节省更多的时间和人力、物力，降低生产成本，提高工作效率。由于RFID标签具有非接触识别、可识别高速运动物体、抗恶劣环境、必威体育官网网址性强、可同时识别多个识别对象等突出特点，射频标签已被广泛应用于工业、商业、交通运输、物流物品管理系统畜禽检疫管理等众多领域。Abstract Radio frequency identification technology is usage of a radio frequency signal through space coupling (alternating magnetic field or electromagnetic field) to achieve non-contact transmission of information and through the message to identify the purpose. RFID is non-contact automatic identification, it gets target and relevant data through the radio frequency signal automatically, identifies without human intervention, can work in a variety of harsh environments. In RFID technology, labels and readers exchange the information through radio frequency signals. Compared with bar code technology, RFID technology can save more time and manpower and material resources, reduce production costs, improve efficiency. As the RFID tag has a non-contact identification, it can identify high-speed objects, anti-poor environment, confidentiality, identify multiple targets simultaneously, such salient features making it widely used in industry, commerce, transportation, logistics, materials management systems, livestock quarantine management and many other fields. Generally speaking, Wiegand protocol is used as communication protocol which is not complicated and widely used. In addition, large data system is related to data storage problems. It must separate data storage areas from data processing areas, which is beneficial to the systems modular and subsequent maintenance. Regarding an RFID integrated module as sample, the design, controlled by single-chipAT89C52, complete the companys attendance system and record the personnel attendance information in the data storage area as well as carry out on liquid cr