单片机C51实现矩阵键盘密码锁

          由矩阵键盘输入密码，按下确认键后，由LCD液晶显示屏输出结果是否正确

STC89C52

keil5

stc烧录软件

普中单片机开发板

LCD1602

#include 
#include "LCD1602.h"    //LCD矩阵键盘头文件
#include "MatrixKey.h"    //矩阵键盘头文件
unsigned char KeyNum;
unsigned int password;
unsigned int password_1 = 0;
unsigned int real_password=2345;    //给定密码值
unsigned int array[10]=0;
unsigned int i = 1;
unsigned int j = 1;

void main()
{
    LCD_Init();
    LCD_ShowString(1,2,"PassWord");
    while(1)
    {

        KeyNum=MatrixKey();
        if(KeyNum)       
        {   
            if(KeyNum<=10)
            {
                password=KeyNum%10;                       
                LCD_ShowNum(2,i,password,1);    //显示出输入的键值
                array[i]=password;            //将输入值赋给数组
                i++;  
            } 
            if(KeyNum==15)                   //确认键按下则判断输入值与给定值是否相等         
            {
                for(j=1;j<5;j++)
                {
                    password_1=array[j]+password_1*10;
                }
                if(password_1==real_password)
                {
                    LCD_ShowString(2,10,"RIGHT!");
                }
                else
                {
                    LCD_ShowString(2,10,"ERROR!");
                }
            }            
        }
               
    }
   
}

#include 
#include "Delay.h"

unsigned char MatrixKey()    //矩阵键盘函数
{
    unsigned char KeyNumber=0;
    //第一
    P1=0xff;
    P1_3=0;
    if(P1_7==0)
        {   Delay(20);
            while(P1_7==0)
                {
                    Delay(20);
                    KeyNumber=1;
                }
        }
    if(P1_6==0)
        {   Delay(20);
            while(P1_6==0)
                {
                    Delay(20);
                    KeyNumber=5;
                }
        }
     if(P1_5==0)
        {   Delay(20);
            while(P1_5==0)
                {
                    Delay(20);
                    KeyNumber=9;
                }
        }   
     if(P1_4==0)
        {   Delay(20);
            while(P1_4==0)
                {
                    Delay(20);
                    KeyNumber=13;
                }
        }
        //第二列
    P1=0xff;
    P1_2=0;
    if(P1_7==0)
        {   Delay(20);
            while(P1_7==0)
                {
                    Delay(20);
                    KeyNumber=2;
                }
        }
    if(P1_6==0)
        {   Delay(20);
            while(P1_6==0)
                {
                    Delay(20);
                    KeyNumber=6;
                }
        }
     if(P1_5==0)
        {   Delay(20);
            while(P1_5==0)
                {
                    Delay(20);
                    KeyNumber=10;
                }
        }   
     if(P1_4==0)
        {   Delay(20);
            while(P1_4==0)
                {
                    Delay(20);
                    KeyNumber=14;
                }
        }
        
        //第三列
    P1=0xff;
    P1_1=0;
    if(P1_7==0)
        {   Delay(20);
            while(P1_7==0)
                {
                    Delay(20);
                    KeyNumber=3;
                }
        }
    if(P1_6==0)
        {   Delay(20);
            while(P1_6==0)
                {
                    Delay(20);
                    KeyNumber=7;
                }
        }
     if(P1_5==0)
        {   Delay(20);
            while(P1_5==0)
                {
                    Delay(20);
                    KeyNumber=11;
                }
        }   
     if(P1_4==0)
        {   Delay(20);
            while(P1_4==0)
                {
                    Delay(20);
                    KeyNumber=15;
                }
        }   
    //第四列
    P1=0xff;
    P1_0=0;
    if(P1_7==0)
        {   Delay(20);
            while(P1_7==0)
                {
                    Delay(20);
                    KeyNumber=4;
                }
        }
    if(P1_6==0)
        {   Delay(20);
            while(P1_6==0)
                {
                    Delay(20);
                    KeyNumber=8;
                }
        }
     if(P1_5==0)
        {   Delay(20);
            while(P1_5==0)
                {
                    Delay(20);
                    KeyNumber=12;
                }
        }   
     if(P1_4==0)
        {   Delay(20);
            while(P1_4==0)
                {
                    Delay(20);
                    KeyNumber=15;
                }
        }    
       
      return KeyNumber;  
}