功能介绍：
0.本系统采用STC89C52作为单片机
2.采用LCD1602液晶屏可以实时查看车位使用情况
3.采用超声波模块HC-SR04来检测车位是否有车，且每个车位都附有LED指示灯来实时显示车位情况
4.采用舵机来模拟栏杆的运动
5.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：
复制代码
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468#include <reg52.h> #include <intrins.h> #include <stdio.h> #include "delay.h" #include "lcd1602.h" #include "rc522.h" #define OFF 1 #define ON 0 #define STARTING_PRICE 2 //起步价 #define HOUR_PRICE 1 //每小时收费 sbit TRIG_1 = P1^0; //接口定义 sbit ECHO_1 = P1^1; //接口定义 sbit LED_VOID_1 = P1^2; sbit LED_PARKING_1 = P1^3; sbit TRIG_2 = P2^0; //接口定义 sbit ECHO_2 = P2^1; //接口定义 sbit LED_VOID_2 = P1^4; sbit LED_PARKING_2 = P1^5; sbit TRIG_3 = P2^4; //接口定义 sbit ECHO_3 = P2^5; //接口定义 sbit LED_VOID_3 = P2^3; sbit LED_PARKING_3 = P2^2; sbit STEERING_ENGINE = P3^2; //舵机 xdata unsigned char dis0[16]; //定义显示区域临时存储数组 unsigned char code CarID[3][4] = {{0x2C, 0x96, 0xE4, 0x17}, {0x4C, 0x8C, 0xE4, 0x17}, {0x0C, 0xD6, 0xBE, 0x16}}; //卡号ID，上位机可通过串口查看卡号ID bit disFlag = 1; //显示标志 bit refreshFlag = 1; //显示标志 bit openFlag = 0; //栏杆启动标志 bit openDir = 0; //栏杆位置标志 unsigned char i; unsigned char occupiedFlag1 = 0; //位置标志 unsigned char occupiedFlag2 = 0; //位置标志 unsigned char occupiedFlag3 = 0; //位置标志 unsigned char occupiedNum = 0; //占用总数 float f_distance1 = 0; //距离1 float f_distance2 = 0; //距离2 float f_distance3 = 0; //距离3 struct { unsigned char inflag; //场内标志 unsigned char stopMinute; //停车总时间 unsigned int stopHour; //停车总时间 }Parking_Status[3]; void Timer1_Init(void); //函数声明 void Measuring(void); //测量 void Display(void); //显示 void CardProcess(void); //刷卡处理 void Open(void); //开启栏杆 void Close(void); //关闭栏杆 void UART_Init(void); //串口初始化 void UART_SendByte(unsigned char dat); void UART_SendStr(unsigned char *s, unsigned char length); void main(void) { Parking_Status[0].inflag = 0; Parking_Status[0].stopMinute = 0; Parking_Status[0].stopHour = 0; Parking_Status[1].inflag = 0; Parking_Status[1].stopMinute = 0; Parking_Status[1].stopHour = 0; Parking_Status[2].inflag = 0; Parking_Status[2].stopMinute = 0; Parking_Status[2].stopHour = 0; TRIG_1 = 0; TRIG_2 = 0; TRIG_3 = 0; TMOD &= 0xF0; //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 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 = 0; //重新赋值 20ms TL0 = 0; EA = 1; //总中断打开 TR0 = 0; PcdReset(); //复位RC522 PcdAntennaOn(); //开启天线发射 LCD_Init(); //初始化液晶 DelayMs(20); //延时有助于稳定 LCD_Clear(); //清屏 Timer1_Init(); //定时器0初始化 UART_Init(); //串口初始化 while (1) { if (refreshFlag == 1) { refreshFlag = 0; Measuring(); } if (disFlag == 1) //定时显示 { disFlag = 0; //标志位清零 CardProcess(); Display(); } } } //超声波测距 void Measuring(void) { static long cnt = 0; //定时器计数 TR1 = 0; TRIG_1 = 1; //启动一次模块 //不可以使用其他终端 容易造成死循环 DelayUs10x(1); TRIG_1 = 0; while (!ECHO_1) ; //当RX为零时等待 TR0 = 1; //开启计数 while (ECHO_1) ; //当RX为1计数并等待 TR0 = 0; cnt = (long)(TH0 * 256 + TL0); TH0 = 0; TL0 = 0; f_distance1 = (float)cnt * 17 / 100.0 * 1.102; //算出来是mm (g_cnt * 340 / 2) / 1000.0 * 1.102;系数 cnt = 0; TRIG_2 = 1; //启动一次模块 //不可以使用其他终端 容易造成死循环 DelayUs10x(1); TRIG_2 = 0; while (!ECHO_2) ; //当RX为零时等待 TR0 = 1; //开启计数 while (ECHO_2) ; //当RX为1计数并等待 TR0 = 0; cnt = (long)(TH0 * 256 + TL0); TH0 = 0; TL0 = 0; f_distance2 = (float)cnt * 17 / 100.0 * 1.102; //算出来是mm (g_cnt * 340 / 2) / 1000.0 * 1.102;系数 cnt = 0; TRIG_3 = 1; //启动一次模块 //不可以使用其他终端 容易造成死循环 DelayUs10x(1); TRIG_3 = 0; while (!ECHO_3) ; //当RX为零时等待 TR0 = 1; //开启计数 while (ECHO_3) ; //当RX为1计数并等待 TR0 = 0; cnt = (long)(TH0 * 256 + TL0); TH0 = 0; TL0 = 0; f_distance3 = (float)cnt * 17 / 100.0 * 1.102; //算出来是mm (g_cnt * 340 / 2) / 1000.0 * 1.102;系数 cnt = 0; TR1 = 1; } //界面显示 void Display(void) { if (f_distance1 <= 500) //检测到车距0.5m { occupiedFlag1 = 1; } //标志 else { occupiedFlag1 = 0; } if (f_distance2 <= 500) //检测到车距0.5m { occupiedFlag2 = 1; } //标志 else { occupiedFlag2 = 0; } if (f_distance3 <= 500) //检测到车距0.5m { occupiedFlag3 = 1; } //标志 else { occupiedFlag3 = 0; } if (occupiedFlag1 == 1) { LCD_DispStr(0, 1, "P "); LED_VOID_1 = OFF; LED_PARKING_1 = ON; } //显示占用 else { LCD_DispStr(0, 1, "N "); LED_VOID_1 = ON; LED_PARKING_1 = OFF; } if (occupiedFlag2 == 1) { LCD_DispStr(2, 1, "P "); LED_VOID_2 = OFF; LED_PARKING_2 = ON; } //显示占用 else { LCD_DispStr(2, 1, "N "); LED_VOID_2 = ON; LED_PARKING_2 = OFF; } if (occupiedFlag3 == 1) { LCD_DispStr(4, 1, "P "); LED_VOID_3 = OFF; LED_PARKING_3 = ON; } //显示占用 else { LCD_DispStr(4, 1, "N "); LED_VOID_3 = ON; LED_PARKING_3 = OFF; } occupiedNum = occupiedFlag1 + occupiedFlag2 + occupiedFlag3; //占用总数 sprintf(dis0, "1 2 3 P:%d N:%d ", (int)occupiedNum, (int)(3 - occupiedNum)); //打印 LCD_DispStr(0, 0, dis0); } //刷卡处理 void CardProcess(void) { unsigned char Temp[4]; //暂存数组 unsigned char UID[4]; //卡号 static unsigned char dispTime = 0; if (PcdRequest(0x52, Temp) == MI_OK) //检测到卡号 { DelayS(1); if (PcdRequest(0x52, Temp) == MI_OK) // 1S后仍然检测到卡号 { if (PcdAnticoll(UID) == MI_OK) //读取卡号成功 { unsigned char i; UART_SendByte(0x00); //串口发送卡号 UART_SendStr(UID, 4); UART_SendByte(0x00); for (i = 0; i < 3; i++) { if ((UID[0] == CarID[i][0]) && (UID[1] == CarID[i][1])) { Open(); //打开栏杆 if (Parking_Status[i].inflag == 0) //没有停车，初次进场 { Parking_Status[i].inflag = 1; //进场 sprintf(dis0, "Car%1d: In ", (int)i+1); LCD_DispStr(6, 1, dis0); dispTime = 50; } else { Parking_Status[i].inflag = 0; //出场 // if (Parking_Status[i].stopHour == 0 && Parking_Status[i].stopMinute < 15) //15分钟以内免费 // { // sprintf(dis0, "Car%1d:%4d$", (unsigned int)i+1, (unsigned int)0); // LCD_DispStr(6, 1, dis0); // Parking_Status[i].stopMinute = 0; // Parking_Status[i].stopHour = 0; // dispTime = 50; //显示一段时间 // } if (Parking_Status[i].stopHour < 2 && Parking_Status[i].stopMinute >= 0) //2小时内起步价 { sprintf(dis0, "Car%1d:$%4d", (unsigned int)i+1, (unsigned int)STARTING_PRICE); LCD_DispStr(6, 1, dis0); Parking_Status[i].stopMinute = 0; Parking_Status[i].stopHour = 0; dispTime = 50; //显示一段时间 } else if (Parking_Status[i].stopHour >= 2) //2小时后正常计费 { sprintf(dis0, "Car%1d:$%4d", (unsigned int)i+1, (unsigned int)(STARTING_PRICE+(Parking_Status[i].stopHour-1)*HOUR_PRICE)); LCD_DispStr(6, 1, dis0); Parking_Status[i].stopMinute = 0; Parking_Status[i].stopHour = 0; dispTime = 50; //显示一段时间 } } } } } } } if (dispTime == 0) { LCD_DispStr(6, 1, " "); } else { dispTime--; } if (dispTime == 1) { Close();//关闭栏杆 } } //定时器1初始化 void Timer1_Init(void) { TMOD |= 0x10; //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 TMOD &= 0x0F; //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 TL1 = 0x66; //设置定时初始值 TH1 = 0xFC; //设置定时初始值 1ms EA = 1; //总中断打开 ET1 = 1; //定时器中断打开 PT1 = 1; TR1 = 1; //定时器开关打开 } //定时器1中断 void Timer1_Interrupt(void) interrupt 3 { static unsigned int time_50ms = 0; TL1 = 0x00; //设置定时初始值 TH1 = 0x4C; //设置定时初始值 50ms time_50ms++; if (time_50ms > 120) // 1min { time_50ms = 0; if (Parking_Status[0].inflag == 1) { Parking_Status[0].stopMinute++; if (Parking_Status[0].stopMinute >= 60) { Parking_Status[0].stopMinute = 0; Parking_Status[0].stopHour++; } } if (Parking_Status[1].inflag == 1) { Parking_Status[1].stopMinute++; if (Parking_Status[1].stopMinute >= 60) { Parking_Status[1].stopMinute = 0; Parking_Status[1].stopHour++; } } if (Parking_Status[2].inflag == 1) { Parking_Status[2].stopMinute++; if (Parking_Status[2].stopMinute >= 60) { Parking_Status[2].stopMinute = 0; Parking_Status[2].stopHour++; } } } if (time_50ms % 20 == 0) { disFlag = 1; } if (time_50ms % 5 == 0) { refreshFlag = 1; } } //开启栏杆 void Open(void) { unsigned char i; for (i = 0; i < 10; i++) { STEERING_ENGINE = 1; DelayUs10x(50); STEERING_ENGINE = 0; DelayUs10x(50); DelayMs(19); } } //关闭栏杆 void Close(void) { unsigned char i; for (i = 0; i < 10; i++) { STEERING_ENGINE = 1; DelayUs10x(250); STEERING_ENGINE = 0; DelayUs10x(50); DelayMs(17); } } void UART_Init(void) { SCON = 0x50; TH2 = 0xFF; TL2 = 0xDC; RCAP2H = 0xFF; //(65536-(FOSC/32/BAUD)) BAUD = 9600 FOSC = 11059200 RCAP2L = 0xDC; /*****************/ TCLK = 1; RCLK = 1; C_T2 = 0; EXEN2 = 0; /*****************/ TR2 = 1; ES = 0; //关闭串口中断 EA = 1; //打开总中断 } void UART_SendByte(unsigned char dat) { unsigned char time_out; time_out = 0x00; SBUF = dat; //将数据放入SBUF中 while ((!TI) && (time_out < 100)) //检测是否发送出去 { time_out++; DelayUs10x(2); } //未发送出去 进行短暂延时 TI = 0; //清除ti标志 } void UART_SendStr(unsigned char *s, unsigned char length) { unsigned char cnt; cnt = 0x00; while (cnt < length) //发送长度对比 { UART_SendByte(*s); //放松单字节数据 s++; //指针++ cnt++; //下一个++ } }
实物演示视频：
https://www.bilibili.com/video/BV1f54y1Z7Su/
最后
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