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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      "};		//OPEN
unsigned char code SetNew[] 	= {"SetNewWordEnable"};
unsigned char code Input[]   	= {"Input:          "};		//INPUT
unsigned 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000000
unsigned 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