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 20msTL0 = (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 20msTL0 = (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/

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基于51单片机的带矩阵键盘指纹密码电子锁原理图PCB

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