基于51单片机AT89C52芯片的可改位数的记忆密码锁，有警报声和门铃（包含免费下载工程代码压缩包，持续更新）

#include <REGX52.H> #include "MatriKey.h" #include "LCD1602.h" #include "String.h" #include "Delay.h" #include "AT24C02.h" #include "PassWord.h" #include "Beep.h" #define Length 3 //长度 #define Administrator "2869902214" //开发者密码设置（建议10位以内） extern unsigned char Number; //键值 unsigned char Count_Input,Count_ERROR; //目前输入的位数，错误次数 unsigned char Write_LCD_PassWord[Length + 1]; //输入的密码 unsigned char Temp_Read_AT[Length + 1]; //读取过渡字符串 unsigned char First_PassWord[Length + 1]; //改密码第一次的字符串 unsigned char Second_PassWord[Length + 1]; //第二次的字符串 unsigned char Administrator_PassWorld[Length + 1]; //忘记密码（Length为目前设置的密码长度） unsigned char Write_Count; //写入的次数 bit ERROR,Wirte_Flag,Success,Success_Flag; //密码错误、写入的标志、密码正确、蜂鸣器正确音效标志 void Set_PassWord() //设置密码 { Count_Input = 0; Wirte_Flag = 1; //进入写入模式 LCD_Init(); LCD_ShowString(1,1,"Write:"); } void Init_PassWord() //初始化密码 { LCD_Init(); if(Wirte_Flag == 0) //如果不为写入状态则 LCD_ShowString(1,1,"PassWord:"); else if(Wirte_Flag == 1) //写入状态 { if(Write_Count == 0) LCD_ShowString(1,1,"Write:"); else LCD_ShowString(1,1,"Again:"); } strcpy(Write_LCD_PassWord," "); //清空密码 Count_Input = 0; //回到密码输入最初位置 Success = 0; //返回后不可修改密码 } void Back_PassWord() //回退密码 { Count_Input = Count_Input - 1; //输入回退一个 Write_LCD_PassWord[Count_Input] = ' '; //赋值空格 LCD_ShowChar(2,Count_Input+1,Write_LCD_PassWord[Count_Input]); //空格覆盖 } void Judge_PassWord() //输入密码的判断结果 { if (strcmp(Write_LCD_PassWord, Temp_Read_AT) == 0 || strcmp(Write_LCD_PassWord, Administrator_PassWorld) == 0) { LCD_ShowString(1,10,"Success"); Success = 1; //正确则赋值1 Success_Flag = 1; //蜂鸣器的赋值 strcpy(Write_LCD_PassWord," "); Count_Input = Length + 1; //确认后不再输入，不再回退 Count_ERROR = 0; //清除 } else //错误 { LCD_ShowString(1,10,"ERROR!!"); ERROR = 1; Count_Input = Length + 1; //确认后不再输入，不再回退，因为i=Length 是最后一位 Count_ERROR++; //如果确认后i=Length 或者0都可以再输入密码 } } void Read_PassWord() //读取正确密码 { unsigned char a; for(a = 0;a<Length ;a++) { Temp_Read_AT[a] = AT24C02_ReadByte(a); } for(a = 0;a<Length ;a++) //读取开发者密码 { Administrator_PassWorld[a] = Administrator[a]; } } void Write_PassWord() //写入正确密码 { unsigned char a; for(a = 0;a<Length ;a++) { AT24C02_WriteByte(a,Write_LCD_PassWord[a]); Delay(5); } } void Change_PassWord() //更改密码 { unsigned char i; if(Write_Count == 0) { for(i=0;i<Length;i++) { First_PassWord[i] = Write_LCD_PassWord[i]; ////遍历length次传递第一次密码 } LCD_Init(); LCD_ShowString(1,1,"Again:"); Count_Input = 0; Write_Count++; } else if(Write_Count == 1) { for(i=0;i<Length;i++) Second_PassWord[i] = Write_LCD_PassWord[i]; //遍历length次传递第二次密码 if(strcmp(Second_PassWord, First_PassWord) == 0) //如果一样 { LCD_Init(); LCD_ShowString(1,1,"Success!"); Success = 0;//改完密码后置0，必须再输入正确密码才可以改 Wirte_Flag = 0; //存入后退出修改密码模式 Write_PassWord(); //存入AT24C02 Count_Input = Length + 1; //防误操作 Success_Flag = 1; //发出蜂鸣器声音 Write_Count = 0; //清除 } else { LCD_Init(); LCD_ShowString(1,1,"Start Again!"); Write_Count = 0; Count_Input = 0; //防误操作 ERROR = 1; //发出蜂鸣器声音 } } } void LCD_PassWord() //LCD显示 { if(Count_Input!=0 && Count_Input <= Length ) //按键之后开始输入密码 { //LCD_ShowChar(2,Count_Input,Write_LCD_PassWord[Count_Input-1]); LCD_ShowChar(2,Count_Input,'*'); } } void Key_Number() //数字和 * # 按键 { if(Count_Input < Length ) { switch(Number) { case 16: Write_LCD_PassWord[Count_Input] = '0'; Count_Input++; break; case 10:Write_LCD_PassWord[Count_Input] = '*'; Count_Input++; break; case 11:Write_LCD_PassWord[Count_Input] = '#'; Count_Input++; break; case 9:Write_LCD_PassWord[Count_Input] = '9';Count_Input++;break; case 8:Write_LCD_PassWord[Count_Input] = '8';Count_Input++;break; case 7:Write_LCD_PassWord[Count_Input] = '7';Count_Input++;break; case 6:Write_LCD_PassWord[Count_Input] = '6';Count_Input++;break; case 5:Write_LCD_PassWord[Count_Input] = '5';Count_Input++;break; case 4:Write_LCD_PassWord[Count_Input] = '4';Count_Input++;break; case 3:Write_LCD_PassWord[Count_Input] = '3';Count_Input++;break; case 2:Write_LCD_PassWord[Count_Input] = '2';Count_Input++;break; case 1:Write_LCD_PassWord[Count_Input] = '1';Count_Input++;break; default :break; } } } void Function_Key() //功能按键 { if(Count_Input == Length && Number == 15 && Wirte_Flag == 0) //确认密码，和确认设置密码 { Judge_PassWord(); //判断密码 } else if(Count_Input == Length && Number == 15 && Wirte_Flag == 1) //确认修改密码 { Change_PassWord(); //修改密码 } if(Count_Input != 0 && Number == 12 && Count_Input != Length + 1) //回退一个密码 { Back_PassWord(); } if(Number == 13) //初始化密码 { Init_PassWord(); } if((Count_Input == Length + 1 || Count_Input == 0) && Number == 14 && Success == 1 ) //设置密码 { Set_PassWord(); } Number = 99;//如果为0，那么0不会进入Key_Flag(); } void PassWord() //执行 { if(Key() != 0) //调用密码键 { if(Number == 101) //如果是101门铃，则不进行下面的操作，防止蜂鸣器再次发声 DoorBell(1); else { if(Wirte_Flag == 0) //输入密码 { Key_Number(); } if(Wirte_Flag == 1) //改写密码 { Key_Number(); } Function_Key(); //调用功能键 Buzzer(); //按键蜂鸣器 } } }