功能：
0.本系统采用STC89C52作为单片机
1.系统采用LCD1602液晶实时显示当前车位状态
2.蓝牙串口间隔5秒发送一次当前车位状态
3.车位检测传感器采用的是红外光电模块，该模块的检测距离可达到80cm左右，能满足该项目的需求。
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 <reg52.h>#include <intrins.h>#include <stdio.h>#include "delay.h"#include "lcd1602.h"sbit PARKING_SPACE_1 = P3^6; //接口定义sbit PARKING_SPACE_2 = P3^5;sbit PARKING_SPACE_3 = P3^4;xdata unsigned char dis0[16]; //定义显示区域临时存储数组xdata unsigned char dis1[16];unsigned char disFlag = 0; //显示标志unsigned char i;bit reportFlag = 0;//上报标志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void Timer0_Init(void); //函数声明void UART_SendStr(unsigned char *s, unsigned char length);void UART_Init(void);void UART_SendByte(unsigned char dat);void main(void){Timer0_Init(); //定时器0初始化UART_Init();LCD_Init(); //初始化液晶DelayMs(20); //延时有助于稳定LCD_Clear(); //清屏while (1){if (PARKING_SPACE_1 == 0) //车位检测到{occupiedFlag1 = 1;} //标志else{occupiedFlag1 = 0;}if (PARKING_SPACE_2 == 0) //车位检测到{occupiedFlag2 = 1;} //标志else{occupiedFlag2 = 0;}if (PARKING_SPACE_3 == 0) //车位检测到{occupiedFlag3 = 1;} //标志else{occupiedFlag3 = 0;}if (disFlag == 1) //定时显示{disFlag = 0; //标志位清零if (occupiedFlag1 == 1){LCD_DispStr(0, 1, "P ");} //显示占用else{LCD_DispStr(0, 1, "N ");}if (occupiedFlag2 == 1){LCD_DispStr(2, 1, "P ");} //显示占用else{LCD_DispStr(2, 1, "N ");}if (occupiedFlag3 == 1){LCD_DispStr(4, 1, "P ");} //显示占用else{LCD_DispStr(4, 1, "N ");}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); //显示}if (reportFlag == 1) //入库上报一次数据{reportFlag = 0; //清楚标志sprintf(dis1, "P:%d N:%d ", (int)occupiedNum, (int)(3 - occupiedNum)); //打印if (occupiedFlag1 == 1){UART_SendStr("N01 Parking ", 12);} //发送占用else{UART_SendStr("N01 Void ", 12);}UART_SendStr("\r\n", 2); //换行DelayMs(1);if (occupiedFlag2 == 1){UART_SendStr("N02 Parking ", 12);} //发送占用else{UART_SendStr("N02 Void ", 12);}UART_SendStr("\r\n", 2); //换行DelayMs(1);if (occupiedFlag3 == 1){UART_SendStr("N03 Parking ", 12);} //发送占用else{UART_SendStr("N03 Void ", 12);}UART_SendStr("\r\n", 2); //换行DelayMs(1);UART_SendStr(dis1, 9);UART_SendStr("\r\n", 2);}}}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 int time_20ms = 0;TH0 = (65536 - 18432) / 256; //重新赋值 20msTL0 = (65536 - 18432) % 256;time_20ms++;if (time_20ms > 500){reportFlag = 1; //串口上报标志 调试使用的time_20ms = 0;}if (time_20ms % 50 == 0) //定时{disFlag = 1;}}void UART_Init(void){SCON = 0x50; // SCON: 模式 1, 8-bit UART, 使能接收TMOD |= 0x20; // TMOD: timer 1, mode 2, 8-bit 重装TH1 = 0xFD; // TH1: 重装值 9600 波特率 晶振 11.0592MHzTL1 = TH1;TR1 = 1; // TR1: timer 1 打开EA = 1; //打开总中断ES = 1; //打开串口中断}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++}}void UART_Interrupt(void) interrupt 4 //串行中断服务程序{unsigned char r_buf;if (RI) //判断是接收中断产生{RI = 0; //标志位清零r_buf = SBUF;}if (TI) //如果是发送标志位，清零{TI = 0;}}
仿真演示视频：
/video/BV1Nd4y1z7rK/
实物演示视频：
/video/BV1MT4y1z7LS/
