功能：
0.本项目采用STC89C52作为单片机系统的控制MCU
1.LCD1602液晶分三种显示模式
a)显示实时速度和本次里程
b)显示当前时间
c)显示报警速度和总里程
2.超过报警速度将声光报警
3.功能按键介绍
a显示状态下:
'上’键——电机速度+1 '下’键——电机速度-1
'设置’键——电机启动/暂停
'切换’键——切换显示状态
b显示状态下:
'设置’键——进入时间设置
'切换’键——切换显示状态
*时间设置状态
'上’键——加1 '下’键——减1
'左’键/'右’键——更改设置坐标
'切换’键——确定
c显示状态下:
'设置’键——进入速度设置
'切换’键——切换显示状态
*报警速度设置状态
'上’键——加1 '下’键——减1
'左’键/'右’键——更改设置选项
'切换’键——确定
*总里程设置状态
'上’键/'下’键——清零
'左’键/'右’键——更改设置选项
'切换’键——确定
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 
#include "main.h"#define DIAMETER 20 //直径，单位mmfloat distance = 0; //单位m
float totalDistBuf = 0; //单位m
float rate = 0; //单位km/h
float totalDist = 0; //单位km
unsigned char rateAlarm = 30; //单位km/h
unsigned char second = 0; 
unsigned char minute = 0; 
unsigned long pulseCnt = 0;
bit dispFlag = 1;
bit setTimeFlag = 0;
bit setAlarmFlag = 0;
bit motorFlag = 0;
bit refreshFlag = 0;
bit writeFlag = 0;
bit isNewFlag = 1;
unsigned char pwmValue = 3;
unsigned char setIndex = 0;enum{DISP_RATE_MODE, DISP_TIME_MODE, SET_ALARM_MODE
} dispMode;void main()
{//初始化LCD_Init();DS1302_Init();EEPROM_Init();//EEPROM_WriteByte(IS_NEW_ADDR, 1); //将芯片设为新芯片ReadEEPROM();if (isNewFlag != 0) //新芯片{EEPROM_WriteByte(IS_NEW_ADDR, 0);//给出初始值rateAlarm = 30;totalDist = 0;WriteEEPROM();}DS1302_ReadTime();Timer0_Init();Timer1_Init();EXT1_Init();//开机显示LCD_DispStr(0, 0, "    Welcome!    ");DelayS(2);LCD_Clear();while(1){//每秒钟更新数据if (refreshFlag == 1){distance = distance + DIAMETER * 2 * 3.14 * (float)pulseCnt / 1000 ; //单位mtotalDist = totalDist + DIAMETER * 2 * 3.14 * (float)pulseCnt / 1000; //单位kmrate = 3.6 * DIAMETER * 2 * 3.14 * (float)pulseCnt / 1000; //单位km/hpulseCnt = 0;EX1 = 1;refreshFlag = 0;}//每分钟写一次EEPROMif (writeFlag == 1){if (totalDist != totalDistBuf) //里程是否发生变化{WriteEEPROM();}totalDistBuf = totalDist;writeFlag = 0;}//显示函数if (dispFlag == 1){if (dispMode == DISP_RATE_MODE){DispRate();}else if (dispMode == DISP_TIME_MODE){if (setTimeFlag == 0){DS1302_ReadTime();DispTime(setIndex, setTimeFlag);}}else if (dispMode == SET_ALARM_MODE){if (setAlarmFlag == 0){// ReadEEPROM();if (totalDist != totalDistBuf){WriteEEPROM();}totalDistBuf = totalDist;DispAlarm(setIndex, setAlarmFlag);}}}//超速报警if (rate > rateAlarm){BUZZER = 0;}else{BUZZER = 1;}KeyProcess();}
}void ReadEEPROM(void)
{isNewFlag    = EEPROM_ReadByte(IS_NEW_ADDR);rateAlarm      = EEPROM_ReadByte(IS_NEW_ADDR + 1);totalDist      = EEPROM_ReadByte(IS_NEW_ADDR + 2);totalDist     = ((unsigned int)totalDist << 8) | EEPROM_ReadByte(IS_NEW_ADDR + 3);
}void WriteEEPROM(void)
{EEPROM_WriteByte(IS_NEW_ADDR + 1, rateAlarm);EEPROM_WriteByte(IS_NEW_ADDR + 2, (((unsigned int)totalDist & 0xFF00) >> 8));EEPROM_WriteByte(IS_NEW_ADDR + 3, ((unsigned int)totalDist & 0x00FF));
}void DispAlarm(unsigned char setIndex, bit setAlarmFlag)
{static unsigned char xdata dispRow0[16];static unsigned char xdata dispRow1[16];if (setAlarmFlag == 1){LCD_WriteCommand(0x0F, 0);}else{LCD_WriteCommand(0x0C, 0);LCD_WriteCommand(0x0C, 0);}sprintf(dispRow0, "Alarm:%6.2fkm/h", (float)rateAlarm);sprintf(dispRow1, "Total:%8.2fkm", (float)totalDist / 1000);LCD_DispStr(0, 0, dispRow0);LCD_DispStr(0, 1, dispRow1);switch (setIndex){case 1: LCD_LocateXY(8, 0); break;case 2: LCD_LocateXY(13, 1); break;default: ;}
}void DispRate()
{static unsigned char xdata dispRow0[16];static unsigned char xdata dispRow1[16];sprintf(dispRow0, "Rate:%7.2fkm/h", rate);sprintf(dispRow1, "Dist:%9.2fkm", distance / 1000);LCD_DispStr(0, 0, dispRow0);LCD_DispStr(0, 1, dispRow1);
}void DispTime(unsigned char setIndex, bit setTimeFlag)
{static unsigned char xdata dispRow0[] = "  /  /     ";static unsigned char xdata dispRow1[] = "      :  :      ";if (setTimeFlag == 1){LCD_WriteCommand(0x0F, 0);}else{LCD_WriteCommand(0x0C, 0);LCD_WriteCommand(0x0C, 0);}dispRow0[0] = timeBufDec[1] / 10 +'0';dispRow0[1] = timeBufDec[1] % 10 +'0';dispRow0[3] = timeBufDec[2] / 10 +'0';dispRow0[4] = timeBufDec[2] % 10 +'0';dispRow0[6] = timeBufDec[3] / 10 +'0';dispRow0[7] = timeBufDec[3] % 10 +'0';dispRow1[4] = timeBufDec[4] / 10 +'0';dispRow1[5] = timeBufDec[4] % 10 +'0';  dispRow1[7] = timeBufDec[5] / 10 +'0';dispRow1[8] = timeBufDec[5] % 10 +'0';dispRow1[10] = timeBufDec[6] / 10 +'0';dispRow1[11] = timeBufDec[6] % 10 +'0';LCD_DispStr(0, 0, dispRow0);LCD_DispStr(0, 1, dispRow1);switch (timeBufDec[7]){case 1: LCD_DispStr(10, 0, " Sun. "); break;case 2: LCD_DispStr(10, 0, " Mon. "); break;case 3: LCD_DispStr(10, 0, " Tue. "); break;case 4: LCD_DispStr(10, 0, " Wed. "); break;case 5: LCD_DispStr(10, 0, "Thur. "); break;case 6: LCD_DispStr(10, 0, " Fri. "); break;case 7: LCD_DispStr(10, 0, " Sat. "); break;default: ;}switch (setIndex){case 1: LCD_LocateXY(1 , 0); break;case 2: LCD_LocateXY(4 , 0); break;case 3: LCD_LocateXY(7 , 0); break;case 4: LCD_LocateXY(14, 0); break;case 5: LCD_LocateXY(5 , 1); break;case 6: LCD_LocateXY(8 , 1); break;case 7: LCD_LocateXY(11, 1); break;default: ;}
}void KeyProcess()
{if (!KEY_SET) //设置键按下{DelayMs(10);if (!KEY_SET){if (dispMode == DISP_TIME_MODE){if (setTimeFlag == 0){setTimeFlag = 1;setIndex = 1;DispTime(setIndex, setTimeFlag);}}else if(dispMode == SET_ALARM_MODE){if (setAlarmFlag == 0){setAlarmFlag = 1;setIndex = 1;DispAlarm(setIndex, setAlarmFlag);}}else{motorFlag = ~motorFlag;}}while (!KEY_SET);}if (!KEY_UP) //上键按下{DelayMs(150);if (!KEY_UP){if (dispMode == DISP_TIME_MODE){if (setTimeFlag == 1){switch (setIndex){case 1:{timeBufDec[1]++;if (timeBufDec[1] >= 100){timeBufDec[1] = 0;}break;}case 2:{timeBufDec[2]++;if (timeBufDec[2] >= 13){timeBufDec[2] = 1;}break;}case 3:{timeBufDec[3]++;if (timeBufDec[3] >= YDay(timeBufDec[1], timeBufDec[2]) + 1){timeBufDec[3] = 1;}break;}case 4:{timeBufDec[7]++;if (timeBufDec[7] > 7){timeBufDec[7] = 1;}break;}case 5:{timeBufDec[4]++;if (timeBufDec[4] >= 24){timeBufDec[4] = 0;}break;}case 6:{timeBufDec[5]++;if (timeBufDec[5] >= 60){timeBufDec[5] = 0;}break;}case 7:{timeBufDec[6]++;if (timeBufDec[6] >= 60){timeBufDec[6] = 0;}break;}default:;}DispTime(setIndex, setTimeFlag);}}else if (dispMode == SET_ALARM_MODE){if (setAlarmFlag){switch (setIndex){case 1:rateAlarm++;if (rateAlarm > 200){rateAlarm = 200;}break;case 2:totalDist = 0;break;}DispAlarm(setIndex, setAlarmFlag);}}else{if (pwmValue <= 11){pwmValue++;}}}//while (!KEY_UP);}if (!KEY_DOWN) //下键按下{DelayMs(150);if (!KEY_DOWN){if (dispMode == DISP_TIME_MODE){if (setTimeFlag == 1){switch (setIndex){case 1:{if (timeBufDec[1] == 0){timeBufDec[1] = 100;}timeBufDec[1]--;break;}case 2:{timeBufDec[2]--;if (timeBufDec[2] < 1){timeBufDec[2] = 12;}break;}case 3:{timeBufDec[3]--;if (timeBufDec[3] < 1){timeBufDec[3] = YDay(timeBufDec[1], timeBufDec[2]);}break;}case 4:{timeBufDec[7]--;if (timeBufDec[7] < 1){timeBufDec[7] = 7;}break;}case 5:{if (timeBufDec[4] == 0){timeBufDec[4] = 24;}timeBufDec[4]--;break;}case 6:{if (timeBufDec[5] == 0){timeBufDec[5] = 60;}timeBufDec[5]--;break;}case 7:{if (timeBufDec[6] == 0){timeBufDec[6] = 60;}timeBufDec[6]--;break;}default:;}DispTime(setIndex, setTimeFlag);}}else if (dispMode == SET_ALARM_MODE){if (setAlarmFlag){switch (setIndex){case 1:if (rateAlarm > 0){rateAlarm--;}break;case 2:totalDist = 0;break;}DispAlarm(setIndex, setAlarmFlag);}}else{if (pwmValue > 3){pwmValue--;}}}//while (!KEY_DOWN);}if (!KEY_LEFT) //左键按下{DelayMs(10);if (!KEY_LEFT){if (dispMode == DISP_TIME_MODE){if (setTimeFlag == 1){setIndex--;if (setIndex < 1){setIndex = 7;}DispTime(setIndex, setTimeFlag);}}else if (dispMode == SET_ALARM_MODE){if (setAlarmFlag){setIndex--;if (setIndex < 1){setIndex = 2;}DispAlarm(setIndex, setAlarmFlag);}}}while (!KEY_LEFT);}if (!KEY_RIGHT) //右键按下{DelayMs(10);if (!KEY_RIGHT){if (dispMode == DISP_TIME_MODE){if (setTimeFlag == 1){setIndex++;if (setIndex > 7){setIndex = 1;}DispTime(setIndex, setTimeFlag);}}if (setAlarmFlag){setIndex++;if (setIndex > 2){setIndex = 1;}DispAlarm(setIndex, setAlarmFlag);}}while (!KEY_RIGHT);}if (!KEY_ENTER) //确认键按下{DelayMs(10);if (!KEY_ENTER){if (dispMode == DISP_RATE_MODE){dispMode = DISP_TIME_MODE;setTimeFlag = 0;setIndex = 0;}else if (dispMode == DISP_TIME_MODE){if (setTimeFlag == 1){setTimeFlag = 0;setIndex = 0;DS1302_WriteTime();DispTime(setIndex, setTimeFlag);}else{dispMode = SET_ALARM_MODE;setIndex = 0;}}else if (dispMode == SET_ALARM_MODE){if (setAlarmFlag == 1){setAlarmFlag = 0;setIndex = 0;WriteEEPROM();DispAlarm(setIndex, setAlarmFlag);}else{dispMode = DISP_RATE_MODE;setIndex = 0;}}}while (!KEY_ENTER);}
}void EXT1_Init()
{IT1 = 1; //下降沿触发EX1 = 1; //使能外部中断0EA = 1; //打开总中断
}void EXT1_Interrupt() interrupt 2 using 1
{pulseCnt++;
}void Timer0_Init(void)
{TMOD &= 0xF0; //定时器模式0TMOD |= 0x01;PT0 = 1; //设置T0为高优先级TH0 = RH_10MS(3); //10msTL0 = RL_10MS(3);TR0 = 1; //启动T0计时ET0 = 1; //打开T0中断EA = 1;  //打开总中断
}void Timer0_Intterupt(void) interrupt 1 using 0
{static unsigned int cnt=0;   static unsigned char IN1Count = 0;//    TH0 = 0xF8; //设置定时初值
//    TL0 = 0xCD; //设置定时初值 2msTH0 = 0xFC; //设置定时初值TL0 = 0x66; //设置定时初值 1msIN1Count++;cnt++;if (motorFlag == 1){if (IN1Count < pwmValue) //占空比调节{MOTOR = 0;    }else if ((IN1Count >= pwmValue) && (IN1Count <= 11)) //关闭时间段{MOTOR = 1;}else{IN1Count = 0; //一个周期结束}}else{MOTOR = 1;}if (cnt >= 250) //500ms{dispFlag = ~dispFlag;cnt = 0;}
}void Timer1_Init(void)
{TMOD &= 0x0F; //定时器模式1TMOD |= 0x10;TH1 = RH_10MS(5); //50msTL1 = RL_10MS(5);TR1 = 1; //开启T1计时ET1 = 1; //打开T1中断EA = 1;  //打开总中断
}void Timer1_Intterupt(void) interrupt 3 using 2
{static unsigned int cnt=0;TH1 = RH_10MS(5); //50msTL1 = RL_10MS(5);cnt++;if (cnt >= 20) //1s{EX1 = 0;if (second >= 60){second = 0;minute++;if (minute == 1){writeFlag = 1;minute = 0;}}else{second++;}refreshFlag = 1;cnt = 0;}
}

仿真演示视频：
https://www.bilibili.com/video/BV13R4y1G7k4/

实物演示视频：
https://www.bilibili.com/video/BV1iY411G7AJ/