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1、单片机电子密码锁 基于51单片机与AT24C02与LCD1602显示单片机电子密码锁 基于51单片机与AT24C02与LCD1602显示 其电路图连接如下：本人已经用硬件实验，程序可用。正确 本程序特点：装载后读者可以自改密码，然后需要再次载入程序时： 可以把主程序aa=Sendstring(0xa0,1,table2,6);这一句去掉。然后程序的电子锁密码就是你个人设置的密码。 程序代码为： #include #include #include #define uchar unsigned char #define uint unsigned int #define LCDIO P2 #de
2、fine delay4us _nop_;_nop_;_nop_;_nop_; uchar buffer6=0; sbit sda=P37; sbit scl=P36; sbit beep=P35; bit flag=0,aa; /用户蹲渊义定时溢出标志位 uchar DSY_BUFFER16= ; uchar DSY_BUFFER116= ; uchar Userpassword6=0; sbit rs=P04; sbit rd=P03; sbit lcden=P02; sbit led=P30; uchar code table2=123456; uchar code table=Your
3、Password.; void delayms(uint z) uint x,y; for(x=z;x0;x-) for(y=110;y0;y-); void delay /短延时，两个机器周期,做总线的延时用 ; void write_com(uchar com) rs=0; rd=0; lcden=0; P2=com; delayms(3); lcden=1; delayms(3); lcden=0; void write_date(uchar date) rs=1; rd=0; lcden=0; P2=date; delayms(3); lcden=1; delayms(3); lcde
4、n=0; void Display_String(uchar *p,uchar com) uchar i; write_com(com); for(i=0;i16;i+) write_date(pi); void init_lcd lcden=0; write_com(0x38); write_com(0x0c); write_com(0x06); write_com(0x01); write_com(0x80); Display_String(table,0x80); Display_String(Lock OK! void start sda=1; scl=1; delay4us; sda
5、=0; delay4us; scl=0; void stop sda=0; scl=1; delay4us; sda=1; delay4us; scl=0; void init sda=1; delay; scl=1; delay; void ack ,0xc0); /初始化 sda=0; scl=1; delay4us; scl=0; sda=1; void noack sda=1; scl=1; delay4us; scl=0; sda=0; uchar recbyte uchar i,rd; rd=0x00; sda=1; for(i=0;i8;i+) scl=1; rd=1; rd|=
6、sda; delay4us; scl=0; delay4us; scl=0; delay4us; return rd; uchar sendbyte(uchar wd) uchar i; bit ack0; for(i=0;i8;i+) sda=(bit)(wd&0x80); _nop_; _nop_; scl=1; delay4us; scl=0; wd=1; delay4us; sda=1; scl=1; delay4us; ack0=!sda; scl=0; delay4us; return ack0; uchar Recstring(uchar slave,uchar subaddr,
7、uchar *buffer,uchar n) uchar i; start; if(!sendbyte(slave) return 0; if(!sendbyte(subaddr) return 0; start; if(!sendbyte(slave+1) return 0; for(i=0;in-1;i+) bufferi=recbyte; ack; buffern-1=recbyte; noack; stop; return 1; uchar Sendstring(uchar slave,uchar subaddr,uchar *buffer,uchar n) uchar i; star
8、t; if(!sendbyte(slave) return 0; if(!sendbyte(subaddr) return 0; for(i=0;in;i+) if(!sendbyte(bufferi) return 0; stop; return 1; void clear_password uchar i; for(i=0;i6;i+) Userpasswordi= ; for(i=0;i40x0F; switch(temp) case 1:keynum+=0;break; case 2:keynum+=4;break; case 4:keynum+=8;break; case 8:key
9、num+=12;break; break; delayms(600); return keynum; void main uchar temp,i=0,j=0,k=0,n; uchar IS_valid_user; beep=1; init; init_lcd; delayms(5); aa=Sendstring(0xa0,1,table2,6); delayms(5); aa=Recstring(0xa0,1,buffer,6); delayms(10); P1=0x0f; while(1) if(P1!=0x0f) temp=Keys_Scan; switch(temp) case 0:
10、case 1: case 2: case 3: case 4: case 5: case 6: case 7: case 8: case 9: if (i=5) /密码限制在6位以内 Userpasswordi=temp; DSY_BUFFERi=*; Display_String(DSY_BUFFER,0xc0); i+; break; case 10: /按A键开锁 for(k=0;k6;k+) if(bufferk=(Userpasswordk+48) flag=1; else flag=0; if (flag=1) flag=0; i=0; led=0; /点亮LED clear_pa
11、ssword; Display_String(OPEN OK! ,0xc0); IS_valid_user = 1; j=0; else j+; led=1; /关闭LED clear_password; Display_String(ERROR!Have try ,0xc0); write_com(0xcf); write_date(0x30+j); IS_valid_user=0; i=0; break; case 11: /按B键上锁 led=1; clear_password; Display_String(table,0x80); Display_String(Lock OK! ,0
12、xc0); i=0; IS_valid_user=0; break; case 12: /按C键设置新密码 /如果是合法用户则提示输入新密码 if ( !IS_valid_user) i=0; Display_String(No rights ! ,0xc0); delayms(1000); Display_String(Your Password.,0x80); Display_String(Lock OK! ,0xc0); else i=0; Display_String(New Password: ,0x80); Display_String( ,0xc0); break; case 1
13、3: /按D键保存新密码 if ( !IS_valid_user) i=0; Display_String(No rights ! ,0xc0); delayms(1000); Display_String(Your Password.,0x80); Display_String(Lock OK! ,0xc0); else i = 0; init; delayms(5); for(k=0;k6;k+) Userpasswordk=Userpasswordk+48; aa=Sendstring(0xa0,1,Userpassword,6); delayms(5); aa=Recstring(0x
14、a0,1,buffer,6); delayms(5); clear_password; Display_String(table,0x00); Display_String(Password Saved! ,0xc0); delayms(1000); Display_String(Do lock agian ? ,0xc0); break; case 14: /按E键消除所有输入 i=0; clear_password; Display_String( ,0xc0); break; case 15: /清除一位 if(i!=0)i-; for(n=0;ni;n+) DSY_BUFFER1n=*; Display_String(DSY_BUFFER1,0xc0); P1=0x0f; if(j=3) Display_String(THIEF!THIEF!,0xc0); j=0; beep=0;
