基于单片机的门禁系统的设计毕业设计.doc

基于单片机的门系统设计关键词：门禁，射频卡，电控锁，显示，控制 Microcontroller-based access control system design ABSTRACT Entrance guard system uses 89C52 single chip microcomputer as control core and periphery add a buzzer control circuit, open the door indicator light circuit, control circuit and control lock LCD display circuit, etc. Entrance guard system mainly by the CPU and reset circuit, the power indicative circuit, work instructions circuit, oscillating circuit, a buzzer circuit, door control circuit, go out and lock button reading card module, display module. The entrance guard system uses RF card complete charge take the door, according to credit to go out, and other functions. Its working principle is: when credit, a buzzer rang, such as card to be allowed to access, display module display card number, and at the same time relay action will open the door lock, indicator light, delay after period of time relay action will again only door lock, lights go out. When the press out button, the relay action will open the door lock, indicator light, delay after period of time relay action will again only door lock, lights go out. When the input password, if you input the correct, relay action will open the door lock, indicator light, delay after period of time relay action will lock door lock again. In addition, the program will also increase the RF card authority judgment function, when facing legal card showed the card number, door open, delay 10 s automatically shut off, when meeting the illegal CARDS dont show the card number locks dont open. The system is simple in design, good performance, and has practical value! KEY WORDS: Access control, Radio frequency card, Electronically controlled lock, Display, control . 目　录 前　言 1 第1章 概述 3 1.1 方案的论述 3 1.1.1 方案的选择 3 1.1.2 CPU的选择 4 1.1.3 射频卡的选择 5 第2章 最小系统的设计 6 2.1 电路图的系统设计 6 2.2 最小系统的设计 7 2.2.1 89C52的简述 7 2.2.2 单片机资源分配 10 2.2.3 硬件电路原理图的设计 11 第3章 硬件电路的设计 12 3.1 门控锁电路设计 12 3.2 显示模块设计 12 3.2.1 1602主要技术参数 13 3.2.2 引脚功能说明 13 3.2.3 1602指令集 15 3.2.4