毕业论文：基于单片机的门禁系统设计15.doc

摘要 随着目前各公司对安全要求的提高，管理水平的不断提升，公司需要加强对进出人员的管理，门禁被许多公司采用。但大多使用的都是单门禁，对于有很多出入通道的公司显然不适用，既不能做到统一管理也缺少了统计、查询和考勤等附加功能，与此同时目前市面上的智能门禁系统多是基于有线通信的方式实现的，具有布线复杂、成本高、定型后不利于重新布线、扩展等诸多缺陷。无线通信方式则克服了有线通信的很多不利因素，因此基于无线通信方式的门禁系统是未来门禁系统的方展方向，本课题设计的就是基于单片机的无线通信联网门禁系统。 本文通过对国内外门禁系统技术发展动态以及技术难点的研究，首先提出一套适合写字楼安全管理的基于单片机的联网式门禁系统。系统基于无线通信模式，采用基于RF射频模块的无线传输平台作为系统的无线传输方式。硬件设计方面，系统采用的是简单实用的直线型网络结构，无线信号的收发核心模块选用的是选择性价比高、集成度高的RF射频模块RFM12。软件设计中，用C语言编写单片机主要子程序易读性高，扩展性好。通过Visual Basic建立合理人性化的人机界面，方面管理者使用。该门禁系统性能价格比高，解决了写字楼管全管理门禁系统采用有线通信方式所存在的难以扩展、难以升级等问题。 关键词：门禁系统，无线通信，非接触式IC卡 ABSTRACT With the advance of safety request and the promotion of management level, every company need strengthen the management of the personnel in and out. Access control is used by many companies, but the most of them are single access control，it is unfitted to the company that has many doors. They can not be managed uniformly and have not the additory function such as statistics, demand and checking on work attendance. However, current aptitudedoor-guard systems are generally based on wire communication. This is unpractical sometimes because its relative expense is high, wires are difficult to be placed, systemupdate is hard. On the other hand, radio communication gets rid of most above demerits. This is why wireless door-guard system is a trend in the future. This topic is designed to non-contact IC card-based wireless communication network access control system. In this thesis, we propose a solution for wireless door-guard system. According to research on door-guard system, we figure out a software and hardware solution specially applying to residence cells. The solution is based on single star network architecture, choosing RF module RF12 as the core module of tranceiver circuit, it also brings in a voice codec platform as voice proceeser. In its software design, through Visual Basic programs the establishment of simple and practical database system and a reasonable human