基于51单片机的电子密码锁设计

要求：

 设计一个电子密码锁

1. 输入密码即可开锁，可删除信息，可通过输入123456789ABCDEF等字符
2. 密码错误发出警报
3. 用LCD1602显示相关信息

当输入正确时 D2会亮灯，表示输入正确

密码输入错误时蜂鸣器会发出警报

部分程序：

#include

typedef unsigned char u8;

typedef unsigned int u16;

//sbit 特殊功能位声明：声明某特殊功能寄存器中的一位

#define key P1                     //按键io口

sbit fen=P3^0;                     //蜂鸣器io口

sbit rs=P3^1;        //LCD控制口

sbit rw=P3^2;

sbit e=P3^3;

sbit led=P3^4;       //LED灯io口

//bit 位变量声明：定义一个位变量的值

u8 keyz=17,j=0,biao1=0,a=10,b=10,c=10,d=10;

bit biao=0;

u16 zh;

u8 shu[]={0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,

          0x09,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f};

u8 zi[]={"lnput password:"};

u8 num[]={"0123456789ABCDEF"};

void delay(u16 i){

          while(i--);

                          }

/*蜂鸣器*/

void Fen(u8 a,b)   //蜂鸣器发声函数

{

         u8 i,j;       

         for(i=0;i

         {

                  for(j=0;j<100;j++)

                   {fen=~fen;delay(b);}

                                            }

                    }

/*LCD*/

void writecom(u8 com){                  //LCD写指令

          rs=0;

          rw=0;

          e=0;

          P0=com;

          delay(5);

          e=1;

          e=0;

                     }

void writedat(u8 dat){             //LCD写数据

          rs=1;

          rw=0;

          e=0;

          P0=dat;

          delay(5);

          e=1;

          e=0;

                     }

void initlcd(){                       //LCD初始化函数

            writecom(0x38);   //显示模式设置

       writecom(0x0c);

            writecom(0x06);

                            }

void xian(){      //LCD显示数字函数

                      writedat(num[keyz]);

                                         if(a==10){a=keyz; }                 //对abcd，四位数的单独赋值

                                              else if(b==10){b=keyz;}

                                              else if(c==10){c=keyz;}

                                              else{d=keyz;}

                                              if(j!=3){j++;}biao=0;

}

/*键盘*/

void Key(){u8 a=0;                    //矩形式键盘函数

          if(key!=0x0f){delay(1000);

          if(key!=0x0f){

                 key=0x0f;

                  switch(key){

                             case 0x07: keyz=0;biao=1;break;

                             case 0x0b: keyz=1;biao=1;break;

                             case 0x0d: keyz=2;biao=1;break;

                             case 0x0e: keyz=3;biao=1;break;

                  }

                  key=0xf0;

                  switch(key){

                             case 0x70: keyz=keyz;biao=1;break;

                             case 0xb0: keyz=keyz+4;biao=1;break;

                             case 0xd0: keyz=keyz+8;biao=1;break;

                             case 0xe0: keyz=keyz+12;biao=1;break;

                  }

          }

          while((a<50)&&(key!=0xf0)){a++;delay(10000);}

          }

            }

                                                    

void shi(){u8 i;   // 按键值判断函数

          if(biao&&keyz!=15){  //判断标志位biao是否为1，为1则有按键操作并且按键的值不等于15            

                         

                           writecom(0x80+0x40+j);                          //数字显示位置进行累加操作

                           if(j<0){j=0;}                                         //数字显示位置边界

                    switch(keyz){                                                     //switch判断按键并执行对应操作

                        case 0:xian(); break;

                                   case 1:xian(); break;

                                   case 2:xian(); break;

                                   case 3:xian(); break;

                                   case 4:xian(); break;

                                   case 5:xian(); break;

                                   case 6:xian(); break;

                                   case 7:xian(); break;

                                   case 8:xian(); break;

                                   case 9:xian(); break;

                                   case 10:writedat(num[keyz]);

                                          

                                                     j++;biao=0;break;

                                   case 11:writedat(num[keyz]);

                                          

                                                     j++;biao=0;break;

                                   case 12:

                                                     biao1=0;                                               //重置标志位biao1,上锁

                                           biao=0;break;

                                   case 13:writecom(0x01);        delay(1000);      //全屏清除

                                                     for(i=0;i

                             writecom(0x80+i);

                             writedat(zi[i]);                 }

                                           j=0;biao=0;break;

                                   case 14:                                                                         //对当前数字位删除的操作

                                                     writedat(' ');

                                                     j--;

                                                     writecom(0x80+0x40+j);writedat(' ');

                                                     biao=0;break;

                                   case 15:                      //确定按键

                                           j++;biao=0;break;

                                        }

                                     }

                          if(keyz==15){                                                               //判断按键值如果等于15，便视为按下确定键

                          writecom(0x01);delay(1000);

                           zh=a*1000+b*100+c*10+d;                                            //将ABCD，四位数合并并进行判断是否为正确密码

                        if(zh==1234){  //设密码为1234

                          j=0;

                      biao1=1;                                                                       //将biao1标志位置1便为密码正确

                      keyz=17;                                                                      //使按键值跳出最大值15便不会循坏显示

                                                     }

                  else{

                             j=0;

                    biao1=0;                                                                                     //反之密码错误

                       keyz=17; 

                          Fen(20,200);                               //蜂鸣器报警

                          }

                          zh=0;a=10,b=10,c=10,d=10;                                     //重置ABCD变量

                      for(i=0;i

               writecom(0x80+i);

               writedat(zi[i]);                         }

                                                                               }        

                              }

                   

内容包括：

需要完整的资料可在我的资源里下载，也可以加入我的纷传圈子，里面有资源压缩包的百度网盘下载地址及提取码。

纷传点击用微信打开即可，过程有点繁琐请见谅。