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随着电子产品向智能化和微型化的不断发展，单片机已成为电子产品研制和开发中首选的控制器。随着人们生活水平的提高，如何实现家庭防盗这一问题也变的尤其的突出，传统的机械锁由于其构造的简单，安全性能低，无法满足人们的需要。
本文从经济实用的角度出发，采用美国Atmel公司的单片机AT89S51与低功耗CMOS型E2PROM AT24C02作为主控芯片与数据存储器单元，结合外围的键盘输入、显示、报警、开锁等电路，用汇编语言编写主控芯片的控制程序，设计了一款可以多次更改密码具有报警功能的电子密码锁。
经实验证明，该密码锁具有设计方法合理，简单易行，成本低，安全实用等特点，符合住宅、办公室用锁要求，具有推广价值。
//包含头文件#include <REG51.h>#include<intrins.h>//宏定义#define LCM_Data P0 //将P0口定义为LCM_Data#define uchar unsigned char #define uint unsigned int//1602的控制脚sbit lcd1602_rs=P2^5;sbit lcd1602_rw=P2^6;sbit lcd1602_en=P2^7;sbit Scl=P3^4;//24C02串行时钟sbit Sda=P3^5;//24C02串行数据sbit ALAM = P2^1;//报警sbit KEY = P3^6;//开锁bit pass=0;//密码正确标志bit ReInputEn=0;//重置输入允许标志bit s3_keydown=0;//3秒按键标志位bit key_disable=0;//锁定键盘标志unsigned char countt0,second;//t0中断计数器,秒计数器void Delay5Ms(void);//声明延时函数unsigned char code a[]={0xFE,0xFD,0xFB,0xF7}; //控盘扫描控制表//液晶显示数据数组unsigned char code start_line[]= {"Password: "};unsigned char code name[] = {"===Coded Lock==="};//显示名称unsigned char code Correct[] = {"correct "};//输入正确unsigned char code Error[] = {"error"}; //输入错误unsigned char code codepass[]= {"pass"}; unsigned char code LockOpen[]= {"open"};//OPENunsigned char code SetNew[] = {"SetNewWordEnable"};unsigned char code Input[] = {"Input:"};//INPUTunsigned char code ResetOK[] = {"ResetPasswordOK "};unsigned char code initword[]= {"Init password..."};unsigned char code Er_try[]= {"error,try again!"};unsigned char code again[]= {"Input again"};unsigned char InputData[6];//输入密码暂存区unsigned char CurrentPassword[6]={0,0,0,0,0,0}; //读取EEPROM密码暂存数组unsigned char TempPassword[6];unsigned char N=0;//密码输入位数记数unsigned char ErrorCont;//错误次数计数unsigned char CorrectCont;//正确输入计数unsigned char ReInputCont; //重新输入计数unsigned char code initpassword[6]={1,2,3,4,5,6};//输入管理员密码后将密码初始为000000unsigned char code adminpassword[6]={1,3,1,4,2,0};//输入管理员密码后将密码初始为000000
