1、44键盘及8位数码管显示构成的电子密码锁设计33 44键盘及8位数码管显示构成的电子密码锁 1实验任务 用44组成09数字键及确认键。用8位数码管组成显示电路提示信息,当输入密码时,只显示“8.”,当密码位数输入完毕按下确认键时,对输入的密码与设定的密码进行比较,若密码正确,则门开,此处用LED发光二极管亮一秒钟做为提示,同时发出“叮咚”声;若密码不正确,禁止按键输入3秒,同时发出“嘀、嘀”报警声;若在3秒之内仍有按键按下,则禁止按键输入3秒被重新禁止。2电路原理图 图4.33.13系统板上硬件连线 (1)把“单片机系统”区域中的P0.0P0.7用8芯排线连接到“动态数码显示”区域中的ABCD
2、EFGH端子上。(2)把“单片机系统“区域中的P2.0P2.7用8芯排线连接到“动态数码显示”区域中的S1S2S3S4S5S6S7S8端子上。(3)把“单片机系统”区域中的P3.0P3.7用8芯排线连接到“44行列式键盘”区域中的R1R2R3R4C1C2C3C4端子上。(4)把“单片机系统”区域中的P1.0用导线连接到“八路发光二极管模块”区域中的L2端子上。(5)把“单片机系统”区域中的P1.7用导线连接到“音频放大模块”区域中的SPK IN端子上。(6)把“音频放大模块”区域中的SPK OUT接到喇叭上。4 程序设计内容 (1)44行列式键盘识别技术:有关这方面内容前面已经讨论过,这里不再
3、重复。(2)8位数码显示,初始化时,显示“P”,接着输入最大6位数的密码,当密码输入完后,按下确认键,进行密码比较,然后给出相应的信息。在输入密码过程中,显示器只显示“8.”。当数字输入超过6个时,给出报警信息。在密码输入过程中,若输入错误,可以利用“DEL”键删除刚才输入的错误的数字。(3)44行列式键盘的按键功能分布图如图4.33.2所示:图4.33.25 C语言源程序 #include unsigned char ps=1,2,3,4,5; unsigned char code dispbit=0xfe,0xfd,0xfb,0xf7, 0xef,0xdf,0xbf,0x7f; unsig
4、ned char code dispcode=0x3f,0x06,0x5b,0x4f,0x66, 0x6d,0x7d,0x07,0x7f,0x6f, 0x77,0x7c,0x39,0x5e,0x79,0x71, 0x00,0x40,0x73,0xff; unsigned char dispbuf8=18,16,16,16,16,16,16,16; unsigned char dispcount; unsigned char flashcount; unsigned char temp; unsigned char key; unsigned char keycount; unsigned ch
5、ar pslen=5; unsigned char getps6; bit keyoverflag; bit errorflag; bit rightflag; unsigned int second3; unsigned int aa,bb; unsigned int cc; bit okflag; bit alarmflag; bit hibitflag; unsigned char oka,okb; void main(void) unsigned char i,j; TMOD=0x01; TH0=(65536-500)/256; TL0=(65536-500)%256; TR0=1;
6、ET0=1; EA=1; while(1) P3=0xff; P3_4=0; temp=P3; temp=temp & 0x0f; if (temp!=0x0f) for(i=10;i0;i-) for(j=248;j0;j-); temp=P3; temp=temp & 0x0f; if (temp!=0x0f) temp=P3; temp=temp & 0x0f; switch(temp) case 0x0e: key=7; break; case 0x0d: key=8; break; case 0x0b: key=9; break; case 0x07: key=10; break;
7、temp=P3; P1_1=P1_1; if(key=0) & (key10) if(keycount6) keycount=6; keyoverflag=1;/key overflow else if(key=12)/delete key if(keycount0) keycount-; getpskeycount=0; dispbufkeycount+2=16; else keyoverflag=1; else if(key=15)/enter key if(keycount!=pslen) errorflag=1; rightflag=0; second3=0; else for(i=0
8、;i0;i-) for(j=248;j0;j-); temp=P3; temp=temp & 0x0f; if (temp!=0x0f) temp=P3; temp=temp & 0x0f; switch(temp) case 0x0e: key=4; break; case 0x0d: key=5; break; case 0x0b: key=6; break; case 0x07: key=11; break; temp=P3; P1_1=P1_1; if(key=0) & (key10) if(keycount6) keycount=6; keyoverflag=1;/key overf
9、low else if(key=12)/delete key if(keycount0) keycount-; getpskeycount=0; dispbufkeycount+2=16; else keyoverflag=1; else if(key=15)/enter key if(keycount!=pslen) errorflag=1; rightflag=0; second3=0; else for(i=0;i0;i-) for(j=248;j0;j-); temp=P3; temp=temp & 0x0f; if (temp!=0x0f) temp=P3; temp=temp &
10、0x0f; switch(temp) case 0x0e: key=1; break; case 0x0d: key=2; break; case 0x0b: key=3; break; case 0x07: key=12; break; temp=P3; P1_1=P1_1; if(key=0) & (key10) if(keycount6) keycount=6; keyoverflag=1;/key overflow else if(key=12)/delete key if(keycount0) keycount-; getpskeycount=0; dispbufkeycount+2
11、=16; else keyoverflag=1; else if(key=15)/enter key if(keycount!=pslen) errorflag=1; rightflag=0; second3=0; else for(i=0;i0;i-) for(j=248;j0;j-); temp=P3; temp=temp & 0x0f; if (temp!=0x0f) temp=P3; temp=temp & 0x0f; switch(temp) case 0x0e: key=0; break; case 0x0d: key=13; break; case 0x0b: key=14; b
12、reak; case 0x07: key=15; break; temp=P3; P1_1=P1_1; if(key=0) & (key10) if(keycount6) keycount=6; keyoverflag=1;/key overflow else if(key=12)/delete key if(keycount0) keycount-; getpskeycount=0; dispbufkeycount+2=16; else keyoverflag=1; else if(key=15)/enter key if(keycount!=pslen) errorflag=1; righ
13、tflag=0; second3=0; else for(i=0;ikeycount;i+) if(getpsi!=psi) i=keycount; errorflag=1; rightflag=0; second3=0; goto a2; errorflag=0; rightflag=1; a2: i=keycount; temp=temp & 0x0f; while(temp!=0x0f) temp=P3; temp=temp & 0x0f; keyoverflag=0;/? void t0(void) interrupt 1 using 0 TH0=(65536-500)/256; TL
14、0=(65536-500)%256; flashcount+; if(flashcount=8) flashcount=0; P0=dispcodedispbufdispcount; P2=dispbitdispcount; dispcount+; if(dispcount=8) dispcount=0; if(errorflag=1) & (rightflag=0) bb+; if(bb=800) bb=0; alarmflag=alarmflag; if(alarmflag=1)/sound alarm signal P1_7=P1_7; aa+; if(aa=800)/light ala
15、rm signal aa=0; P1_0=P1_0; second3+; if(second3=6400) second3=0; errorflag=0; rightflag=0; alarmflag=0; bb=0; aa=0; else if(errorflag=0) & (rightflag=1) P1_0=0; cc+; if(cc1000) okflag=1; else if(cc2000) okflag=0; else errorflag=0; rightflag=0; P1_7=1; cc=0; oka=0; okb=0; okflag=0; P1_0=1; if(okflag=1) oka+; if(oka=2) oka=0; P1_7=P1_7; else okb+; if(okb=3) okb=0; P1_7=P1_7; if(keyoverflag=1) P1_7=P1_7;
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