单片机门禁

1. 基于单片机的人脸识别门禁

单片机的人脸识别方式利用的就是NFC功能键。
打开设备的NFC功能，然后选择扫描卡片。
添加门禁卡的扫码就可以。

2. 51单片机独立按键控制门禁密码

#include "reg51.h"

#include "display_7seg_4.h"

sbit KEY1 = P1^0;

sbit KEY2 = P1^1;

sbit KEY3 = P1^2;

sbit KEY4 = P1^3;

sbit KEY5 = P3^0;

sbit KEY6 = P3^1;

sbit KEY7 = P3^2;

sbit KEY8 = P3^3;

sbit KEY9 = P3^4;

sbit KEY0 = P3^5;

sbit KEYE = P3^6;

sbit LED = P1^5;

unsigned int count=0;

void main(void)

{

unsigned char keyvalue;

unsigned char i=0;

unsigned char dis[4]={10,10,10,10};

unsigned int password;

LED = 0;

while(1)

{

keyvalue = 20;

if(KEY1 == 0)

{

while(!KEY1);

keyvalue = 1;

}

if(KEY2 == 0)

{

while(!KEY2);

keyvalue = 2;

}

if(KEY3 == 0)

{

while(!KEY3);

keyvalue = 3;

}

if(KEY4 == 0)

{

while(!KEY4);

keyvalue = 4;

}

if(KEY5 == 0)

{

while(!KEY5);

keyvalue = 5;

}

if(KEY6 == 0)

{

while(!KEY6);

keyvalue = 6;

}

if(KEY7 == 0)

{

while(!KEY7);

keyvalue = 7;

}

if(KEY8 == 0)

{

while(!KEY8);

keyvalue = 8;

}

if(KEY9 == 0)

{

while(!KEY9);

keyvalue = 9;

}

if(KEY0 == 0)

{

while(!KEY0);

keyvalue = 0;

}

if(KEYE == 0)

{

while(!KEYE);

keyvalue = 10;

}

if(keyvalue != 20)

{

if(keyvalue == 10)

{

i=0;

password = dis[0]*1000+dis[1]*100+dis[2]*10+dis[3];

if(password == 1234)

{

LED = 1;

}

else

{

LED = 0;

}

dis[0] = 10;

dis[1] = 10;

dis[2] = 10;

dis[3] = 10;

}

else

{

dis[i] = keyvalue;

i++;

}

}

display_seg(dis);

}

}