基于51单片机的带矩阵键盘指纹密码电子锁原理图PCB

功能：
0.本系统采用STC89C52作为单片机
1.LCD1602液晶显示功能界面
2.支持添加/删除/搜索指纹，更改密码
3.支持指纹和密码开锁
4.采用DC002作为电源接口可直接输入5V给整个系统供电

原理图：

PCB ：

主程序：

#include "main.h"

enum ModeFlag_Df ModeFlag; //模式，正常开锁模式，设置密码模式，设置指纹模式
unsigned char stepCnt = 0;
char setIndex = 0;
xdata unsigned char dis0[16];
bit refreshFlag = 1;
unsigned char inpPasswd[4]; //输入密码
unsigned char Passwd[4] = {'0','0','0','0'}; //初始密码
unsigned char isNewFlag = 1;

void main()
{
    LOCK = OPEN; //锁打开
    DelayMs(200);
    LOCK = CLOSE; //锁关闭

    EEPROM_Init();
    DelayMs(200);

    // EEPROM_WriteByte(IS_NEW_ADDR, 1);
    
    ReadPassword(); //初次使用时屏蔽此句
    if (isNewFlag != 0)
    {
        unsigned char i = 0;
        
        EEPROM_WriteByte(IS_NEW_ADDR, 0);
        for (i = 0; i < 4; i++)
        {
            Passwd[i] = '0';
        }
        WritePassword();
    }

    LCD_Init(); //初始化液晶
    LCD_DispStr(0, 0, "Fingerprint Lock"); //液晶开机显示界面
    Timer0_Init(); //初始化定时器
    Uart_Init();  //初始化串口
    DelayMs(200);
    DelayMs(200);
    DelayMs(200); //延时500MS，等待指纹模块复位
    Device_Check(); //校对指纹模块是否接入正确，液晶做出相应的提示
    DelayMs(200);
    DelayMs(200);
    DelayMs(200); //对接成功界面停留一定时间

    LCD_Clear();
    LCD_DispStr(0, 0, "Enter pw or fp: "); //显示

    while (1)
    {
        if (refreshFlag == 1)
        {
            TR0 = 0;
            refreshFlag = 0;
            if (ModeFlag == NORMAL)
            {
                if (stepCnt == 0)
                {
                    LCD_DispStr(0, 0, "Enter pw or fp: "); //显示
                    LCD_DispStr(0, 1, "                ");
                }
                CTRL_BY_FPM10A_Find_Fingerprint(); //搜索指纹
            }
            else if (ModeFlag == OLD_PW)
            {
                if (stepCnt == 0)
                {
                    LCD_DispStr(0, 0, "Old Password:   "); //显示
                    LCD_DispStr(0, 1, "                ");
                }
            }
            else if (ModeFlag == SELECT_PW_FP)
            {
                LCD_DispStr(0, 0, "A.Set Password  "); //显示
                LCD_DispStr(0, 1, "B.SetFingerprint");
            }
            else if (ModeFlag == SET_PW)
            {
                if (stepCnt == 0)
                {
                    LCD_DispStr(0, 0, "New Password:   "); //显示
                    LCD_DispStr(0, 1, "                ");
                }
            }
            else if (ModeFlag == SET_FP_SELECT)
            {
                Into_FP();
            }
            else if (ModeFlag == FIND_FP)
            {
                FPM10A_Find_Fingerprint();
            }
            else if (ModeFlag == ADD_FP)
            {
                FPM10A_Add_Fingerprint();
            }
            else if (ModeFlag == DELETE_FP)
            {
                LCD_DispStr(0, 0, "   Empty All    ");
                LCD_DispStr(0, 1, "  A.Yes  B.No   ");
            }
            TR0 = 1;
        }

        Key_Process(Calkey_scan());

    }
}

void Timer0_Init(void)
{
    TMOD |= 0x01;                //使用模式1，16位定时器，使用"|"符号可以在使用多个定时器时不受影响
    TH0 = (65536 - 18432) / 256; //重新赋值 20ms
    TL0 = (65536 - 18432) % 256;
    EA = 1;  //总中断打开
    ET0 = 1; //定时器中断打开
    TR0 = 1; //定时器开关打开
}

void Timer0_Interrupt(void) interrupt 1
{
    static unsigned char time_20ms = 0;

    TH0 = (65536 - 18432) / 256; //重新赋值 20ms
    TL0 = (65536 - 18432) % 256;
    time_20ms++;
    if (time_20ms > 10) //定时显示
    {
        refreshFlag = 1;
        time_20ms = 0;
    }
}

void Open_Lock(void) //打开电磁锁
{
    LOCK = OPEN;
    DelayMs(250);
    DelayMs(250);
    LOCK = CLOSE;
}

void Into_FP(void)
{
    /**************进入主功能界面****************/
    if (setIndex == 0)
    {
        LCD_DispStr(0, 0, " *Search finger "); //第一排显示搜索指纹
        LCD_DispStr(0, 1, "  Add     Delete"); //添加和删除指纹
    }
    else if (setIndex == 1)
    {
        LCD_DispStr(0, 0, "  Search finger "); //第一排显示搜索指纹
        LCD_DispStr(0, 1, " *Add     Delete"); //添加和删除指纹
    }
    else if (setIndex == 2)
    {
        LCD_DispStr(0, 0, "  Search finger "); //第一排显示搜索指纹
        LCD_DispStr(0, 1, "  Add    *Delete"); //添加和删除指纹
    }
}

void ReadPassword(void)
{
    unsigned char i = 0;

    isNewFlag = EEPROM_ReadByte(IS_NEW_ADDR);

    for (i = 0; i < 4; i++)
    {
        Passwd[i] = EEPROM_ReadByte(PASSWORD_ADDR + i);
    }
}

void WritePassword(void)
{
    unsigned char i = 0;
    
    for (i = 0; i < 4; i++)
    {
        EEPROM_WriteByte(PASSWORD_ADDR + i, Passwd[i]);
    }
}

void Key_Process(unsigned char keyCode)
{
    static unsigned char count_num = 0;
    static unsigned char i = 0;
    
    if (ModeFlag == NORMAL)
    {
        if (keyCode == 'A') //设置键
        {
            ModeFlag = OLD_PW;
        }
        else if ((keyCode >= '0') && (keyCode <= '9'))
        {
            stepCnt = 1;
            if (count_num <= 3)
            {
                inpPasswd[count_num] = keyCode;
                // LCD_DispOneChar((count_num+6), 1, inpPasswd[count_num]);
                LCD_DispOneChar((count_num+6), 1, '*');
                count_num++;
            }
            if (count_num == 4)
            {
                DelayMs(250);
                DelayMs(250);
                for (i = 0; i < 4; i++) //判断密码是否正确
				{
					if (inpPasswd[i] != Passwd[i])
						break;
				}
				if (i == 4) //密码输入正确
				{
                    LCD_DispStr(0, 1, "      Open      "); //显示状态
                    Open_Lock();
				}
                else
                {
                    LCD_DispStr(0, 1, "     Error      "); //显示状态
                    Buzz_Times(2);
                }
                DelayMs(250);
                DelayMs(250);
                stepCnt = 0;
                count_num = 0;
            }
        }
    }
    else if (ModeFlag == OLD_PW)
    {
        if ((keyCode >= '0') && (keyCode <= '9')) //输入旧密码
        {
            stepCnt = 1;
            if (count_num <= 3)
            {
                inpPasswd[count_num] = keyCode;
                // LCD_DispOneChar((count_num+6), 1, inpPasswd[count_num]);
                LCD_DispOneChar((count_num+6), 1, '*');
                count_num++;
            }
            if (count_num == 4)
            {
                DelayMs(250);
                DelayMs(250);
                for (i = 0; i < 4; i++) //判断密码是否正确
                {
                    if (inpPasswd[i] != Passwd[i])
                        break;
                }
                if (i == 4) //密码输入正确
                {
                    LCD_DispStr(0, 1, "     Right      "); //显示状态
                    DelayMs(250);
                    DelayMs(250);
                    ModeFlag = SELECT_PW_FP;
                }
                else
                {
                    LCD_DispStr(0, 1, "     Error      "); //显示状态
                    Buzz_Times(2);
                    DelayMs(250);
                    DelayMs(250);
                    ModeFlag = NORMAL; //返回最初界面
                }
                stepCnt = 0;
                count_num = 0;
            }
        }
    }
    else if (ModeFlag == SELECT_PW_FP)
    {
        if (keyCode == 'A')
        {
            ModeFlag = SET_PW;
        }
        else if (keyCode == 'B')
        {
            ModeFlag = SET_FP_SELECT;
            setIndex = 0;
        }
    }
    else if (ModeFlag == SET_PW)
    {
        if ((keyCode >= '0') && (keyCode <= '9')) //设置新密码
        {
            stepCnt = 1;
            if (count_num <= 3)
            {
                Passwd[count_num] = keyCode;
                LCD_DispOneChar((count_num+6), 1, Passwd[count_num]);
                count_num++;
            }
            if (count_num == 4)
            {
                DelayMs(250);
                DelayMs(250);
                LCD_DispStr(0, 1, "      OK        "); //显示状态
                WritePassword();
                DelayMs(250);
                DelayMs(250);
                ModeFlag = NORMAL;
                stepCnt = 0;
                count_num = 0;
            }
        }
        else if (keyCode == 'B')
        {
            ModeFlag = SELECT_PW_FP;
        }
    } 
    else if (ModeFlag == SET_FP_SELECT)
    {
        if (keyCode == 'A') //确认
        {
            switch (setIndex)
            {
            case 0: //搜索指纹
                ModeFlag = FIND_FP;
                // FPM10A_Find_Fingerprint();
                break;

            case 1: //添加指纹
                ModeFlag = ADD_FP;
                // FPM10A_Add_Fingerprint();
                break;

            case 2: //清空指纹
                ModeFlag = DELETE_FP;
                // FPM10A_Delete_All_Fingerprint();
                break;
            }
        }
        else if (keyCode == 'B')
        {
            ModeFlag = SELECT_PW_FP;
        }
        else if (keyCode == '*') //设置位置移动
        {
            setIndex--;
            if (setIndex < 0)
            {
                setIndex = 2;
            }
        }
        else if (keyCode == '#') //设置位置移动
        {
            setIndex++;
            if (setIndex > 2)
            {
                setIndex = 0;
            }
        }
    }
    else if (ModeFlag == FIND_FP)
    {
        if (keyCode == 'B')
        {
            ModeFlag = SET_FP_SELECT;
        }
    }
    else if (ModeFlag == DELETE_FP)
    {
        if (keyCode == 'A')
        {
            LCD_DispStr(0, 0, "   Emptying     ");
            LCD_DispStr(0, 1, "                ");
            DelayMs(250);
            FINGERPRINT_Cmd_Delete_All_Model();
            FPM10A_Receive_Data(12);
            LCD_DispStr(0, 0, "   All empty    ");
            LCD_DispStr(0, 1, "                ");
            Buzz_Times(3);
            DelayMs(250);
            ModeFlag = NORMAL;
        }
        else if (keyCode == 'B')
        {
            ModeFlag = SET_FP_SELECT;
        }
    }

    if (keyCode == 'D')
    {
        ModeFlag = NORMAL;
        stepCnt = 0;
        count_num = 0;
        setIndex = 0;
    }
}

实物演示视频：
https://www.bilibili.com/video/BV1b3411j7DF/文章来源地址https://www.toymoban.com/news/detail-540712.html

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