摘 要：当代社会，科学技术迅速发展，人们越来越注重自身的信息安全。指纹作为每个人独一无二的特征，具有不可复制性和永久性，用指纹来识别、验证身份有得天独厚的优势，指纹识别技术被应用在各种领域。

本文主要介绍了以STC89C52单片机为主要器材的指纹识别系统的硬件电路设计。硬件电路主要包括指主模块、指纹识别模块、电源电路、按键电路、蜂鸣器电路、显示模块等等。系统通过AS601进行指纹识别，并通过串口连接到51单片机，运用不同按键操作，向指纹模块发送相应的操作指令，从而实现指纹的录入、删除、识别等功能。该系统可实现录入960个指纹，具有方便、高效、安全等特点。93908

毕业论文关键词：指纹识别系统,STC89C52单片机,串口通信

Abstract：In modern society, the rapid development of science and technology, people pay more and more attention to their information security。 The fingerprint characteristics of each person as the one and only, can not be copied and permanent, using fingerprint to identify and verify the identity of a richly endowed by nature the advantages of fingerprint identification technology has been applied in various fields。 

This paper mainly introduces the hardware circuit design of fingerprint identification system based on STC89C52 microcontroller as the main equipment。 The hardware circuit mainly includes a main module, a fingerprint identification module, power supply circuit, key circuit, buzzer circuit, display module and so on。 The system of fingerprint identification by AS601, and connected to the 51 microcontroller through the serial port, using different key operation the fingerprint module sends the corresponding operating instructions, so as to realize the fingerprint recognition, delete，input and other functions。 The system can realize 960 input fingerprint, has the advantages of convenient, efficient, and safe operation。

Key words: Fingerprint identification system, STC89C52 microcontroller, serial communication

目  录

1 绪论 4

1。1论文的背景及意义 4

1。2指纹识别技术的应用现状及发展前景 4

1。3本论文研究的内容 4

2系统概述 4

2。1指纹识别系统的工作原理 4

2。2系统框架 5

2。3主控芯片的选择 5

3系统硬件设计 7

3。1单片机外部电路 7

3。2电源电路 8

3。3按键电路 8

3。4继电器电路 8

3。5显示模块 9

3。6指纹模块 9

3。7蜂鸣器电路 11

4系统的软件分析及设计 11

4。1编程软件介绍 11

4。2系统主程序设计 11

4。3液晶显示模块程序设计 12

5实物制作与系统调试 12

5。1硬件材料 12

5。2硬件的组装及焊接 13

5。3系统调试