基于单片机的电子密码锁设计程序及电路图

基于单片机电子密码锁设计程序#include <AT89X51.h>#define uchar unsigned charuchar starbuf[10];uchar wordbuf[8];uchar pw[8]={1,2,3,4,5,6,7,8};uchar pwbuf[8];uchar count=0;// 初始没有输入密码，计数器设为0uchar inputflag=0;// 先处于密码输入状态，非密码修改状态bit enterflag=0; // 没有按下确认键bit pwflag=0;// 密码标志先置为0sbit warn=P3^6;#define lcd_data P0sbit rs=P2^7;sbit rw=P2^6;sbit e=P2^5;///////////////////////LCD1602驱动程序///////////////////////void delay_1602(unsigned int i) {while(i--);}void enrw(){rs=0;rw=0;e=0;delay_1602(250);e=1;}write_data(uchar c){lcd_data=c;rs=1;rw=0;e=0;delay_1602(250);e=1;}init_lcd(void)//初始化{lcd_data=0x01;//清屏幕enrw();lcd_data=0x38;//数据长度为8位,双行显示,5*7字符。

enrw();lcd_data=0x0c;//打开显示开关enrw();lcd_data=0x06;//地址计数递增，显示屏不移动enrw();}write_cmd(uchar m)//写命令，注意与写数据的区别{lcd_data=m;enrw();}display(uchar row,uchar colum,uchar *s)//行列字符写字符串，简单的指针应用{uchar p;if(row==1)p=0x82+colum-1;elsep=0xC0+colum-1;write_cmd(p);for(;*s!='\0';s++)write_data(*s);}void lcd_display( unsigned char a, unsigned char b,unsigned char i)//行列数{switch (i){case 0:display( a,b, "0") ;break;/* 0 */case 1:display( a,b, "1") ;break;/* 1 */case 2:display( a,b, "2") ;break;/* 2 */case 3:display( a,b, "3") ;break;/* 3 */case 4:display( a,b, "4") ;break;/* 4 */case 5:display( a,b, "5") ;break;/* 5 */case 6:display( a,b, "6") ;break;/* 6 */case 7:display( a,b, "7") ;break;/* 7 */case 8:display( a,b, "8") ;break;/* 8 */case 9:display( a,b, "9") ;break;/* 9 */default: break;}}/* 键消抖延时函数*/void delay(unsigned int i){int j;for(;i>0;i--)for(j=0;j<100;j++);}/* 键扫描函数*/uchar keyscan(void){uchar scancode,tmpcode;P1 = 0xf0;// 发全0行扫描码if ((P1&0xf0)!=0xf0)// 若有键按下{delay(2);// 延时去抖动if ((P1&0xf0)!=0xf0)// 延时后再判断一次，去除抖动影响{scancode = 0xfe;//第一行变低while((scancode&0x10)!=0)// 逐行扫描{P1 = scancode;// 输出行扫描码if ((P1&0xf0)!=0xf0)// 本行有键按下{tmpcode = (P1&0xf0)|0x0f;/* 返回特征字节码，为1的位即对应于行和列*/return((~scancode)+(~tmpcode));}else scancode = (scancode<<1)|0x01;// 行扫描码左移一位}}}return(0);// 无键按下，返回值为0}/* 密码比较函数*/bit pwcmp(void){bit flag;uchar i;for (i=0;i<8;i++){if (pw[i]==pwbuf[i])flag = 1;else{flag = 0;i=8;}}return(flag);}/* 密码清除函数*/void pwclk(unsigned char k){unsigned char i;for (i=0;i<8;i++){wordbuf[i] = 0;// 数码管显示00000000starbuf[i] = 0;if(k==0)pwbuf[i] = 0;// 用FFFFFF清除已经输入的密码elsepw[i] = 0;// 用FFFFFF清除已经输入的密码}}/* 按键声响函数*/void alarm(){unsigned char i;for(i=0;i<200;i++){warn=!warn;delay(1);}}/* 密码报警函数*/ void alarm1(){unsigned int i;for(i=0;i<2000;i++){warn=!warn;delay(1);}}/* 呼叫报警函数*/ void alarm2(){unsigned char i=12; unsigned char a,b; while(i>0){for(a=0;a<150;a++){warn=!warn;delay(1);}for(b=0;b<150;b++){warn=!warn;delay(2);}i--;}}/* 按键处理函数*/void key_conduct(unsigned char a,unsigned char b){switch(a){case 0x11:// 1行1列，数字0if (count<8){if(b==0){starbuf[count] = '*';// 对应密码位上显示'*'pwbuf[count] = 0;}else{pw[count] = 0;wordbuf[count] = 0;lcd_display(2,count+1,wordbuf[count]);}count++;}alarm();break;case 0x21:// 1行2列，数字1 if (count<8){if(b==0){starbuf[count] = '*';// 对应密码位上显示'*'pwbuf[count] = 1;}else{pw[count] = 1;wordbuf[count] = 1;lcd_display(2,count+1,wordbuf[count]);}count++;}alarm();break;case 0x41:// 1行3列，数字2 if (count<8){if(b==0){starbuf[count] = '*';// 对应密码位上显示'*'pwbuf[count] = 2;}else{pw[count] = 2;wordbuf[count] = 2;lcd_display(2,count+1,wordbuf[count]);}count++;}alarm();break;case 0x81:// 1行4列，数字3 if (count<8){if(b==0){starbuf[count] = '*';// 对应密码位上显示'*'pwbuf[count] = 3;}else{pw[count] = 3;wordbuf[count] = 3;lcd_display(2,count+1,wordbuf[count]);}count++;}alarm();break;case 0x12:// 2行1列，数字4 if (count<8){if(b==0){starbuf[count] = '*';// 对应密码位上显示'*'pwbuf[count] = 4;}else{pw[count] = 4;wordbuf[count] = 4;lcd_display(2,count+1,wordbuf[count]);}count++;}alarm();break;case 0x22:// 2行2列，数字5 if (count<8){if(b==0){starbuf[count] = '*';// 对应密码位上显示'*'pwbuf[count] = 5;}else{pw[count] = 5;wordbuf[count] = 5;lcd_display(2,count+1,wordbuf[count]);}count++;}alarm();break;case 0x42:// 2行3列，数字6 if (count<8){if(b==0){starbuf[count] = '*';// 对应密码位上显示'*'pwbuf[count] = 6;}else{pw[count] = 6;wordbuf[count] = 6;lcd_display(2,count+1,wordbuf[count]);}count++;}alarm();break;case 0x82:// 2行4列，数字7 if (count<8){if(b==0){starbuf[count] = '*';// 对应密码位上显示'*'pwbuf[count] = 7;}else{pw[count] = 7;wordbuf[count] = 7;lcd_display(2,count+1,wordbuf[count]);}count++;}alarm();break;case 0x14:// 3行1列，数字8 if (count<8){if(b==0){starbuf[count] = '*';// 对应密码位上显示'*'pwbuf[count] = 8;}else{pw[count] = 8;wordbuf[count] = 8;lcd_display(2,count+1,wordbuf[count]);}count++;}alarm();break;case 0x24:// 3行2列，数字9 if (count<8){if(b==0){starbuf[count] = '*';// 对应密码位上显示'*'pwbuf[count] = 9;}else{pw[count] = 9;wordbuf[count] = 9;lcd_display(2,count+1,wordbuf[count]);}count++;}alarm();break;case 0x44:// 3行3列，确认键enterflag = 1;// 确认键按下if(b==0){if (count==8) // 只有输入8个密码后按确认键才作密码比较pwflag = pwcmp();elsepwflag = 0;// 否则直接pmflag赋0 pwclk(b);//输入密码并判断之后清除}else{if (count==8) // 只有输入8个密码后按确认键才作密码比较pwflag = 1;else{pwflag = 0;pwclk(b);}}break;case 0x84:// 3行4列，取消键count = 0;// 密码计数清零pwclk(b);init_lcd();break;case 0x18:// 4行1列，密码修改键inputflag=1;// 进入密码修改模式count = 0;init_lcd();break;case 0x28:// 4行2列，密码修改键inputflag=0;// 退出密码修改模式count = 0;init_lcd();break;case 0x48:init_lcd();// 关于作品display(1,0,"Author: 083521047HCY");display(2,2,"QQ:393388456 ");delay(3000);init_lcd();break;case 0x88:init_lcd();// 清屏break;default: break;}}/* 主程序*/void main(){uchar key,error=0;init_lcd();while(1){while(inputflag==0)// 输入密码模式{display(1,0,"Input password:");display(2,0,starbuf);key = keyscan();// 调用键盘扫描函数key_conduct(key,inputflag);if(enterflag==1)// 如果按下确认键{enterflag = 0; // 标志位置回0count = 0;// 密码位计数器清零pwclk(inputflag);if(pwflag==1)// 如果密码输入正确{init_lcd();display(1,0,"Correct!");pwclk(0);delay(2000);error=0;}else{init_lcd();init_lcd();init_lcd();display(1,0,"Password wrong!");alarm1();error++;}while(error>=3)// 如果密码输入错误三次{init_lcd();init_lcd();display(1,0,"No access!");alarm2();while(1);}}}while(inputflag==1)// 更改密码模式{display(1,0,"New password:");key = keyscan();// 调用键盘扫描函数key_conduct(key,inputflag);if(enterflag==1)// 如果按下确认键{enterflag = 0; // 标志位置回0count = 0;// 密码位计数器清零if(pwflag==1)// 如果密码修改正确{inputflag=0;init_lcd();display(1,0,"Change finish!");delay(2000);}else{init_lcd();display(1,0,"Change fail!");pwclk(1);alarm1();}}}}}电路图。