功能介绍：
0.本系统采用STC89C52作为单片机
1.LCD1602液晶实时循环显示3路超声波探测距离，同时WIFI串口上报
2.带有WiFi模块，可与手机实现数据交互，WiFi模块型号采用是常见到ESP8266
3.超声波模块采用的是分离式HC-SR04模块，该模块价格便宜，性能稳定，盲区只有几厘米，最大可测数米距离。
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"#define OFF 1#define ON 0sbit 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;unsigned char dis0[21]; //定义显示区域临时存储数组bit disFlag = 0; //显示标志unsigned char i;unsigned char occupiedFlag1 = 0; //位置标志1unsigned char occupiedFlag2 = 0; //位置标志2unsigned char occupiedFlag3 = 0; //位置标志3unsigned char occupiedNum = 0; //占用总数unsigned char channel = 0; //通道float f_distance[3] = 0; //距离//函数声明void Timer0_Init(void);void Timer1_Init(void);void Measuring(unsigned char channel);void UART_SendStr(unsigned char *s, unsigned char length);void UART_Init(void);void UART_SendByte(unsigned char dat);void main(void){TRIG_1 = 0;TRIG_2 = 0;TRIG_3 = 0;Timer0_Init(); //定时器0初始化Timer1_Init(); //定时器1初始化DelayS(1);UART_Init(); //初始化串口/************************* WIFI模式配置 *************************/UART_SendStr("AT+CIPMUX=1\r\n", 13); //打开多连接DelayS(1);UART_SendStr("AT+CIPSERVER=1,8080\r\n", 21); //建立服务 端口号为8080LCD_Init(); //初始化液晶DelayMs(20); //延时有助于稳定LCD_Clear(); //清屏while (1){if (disFlag == 1) //定时显示 2s刷新一次{disFlag = 0; //标志位清零channel++;if (channel > 3){channel = 1;}Measuring(channel);sprintf(dis0, " Channel %02d ", (int)channel);LCD_DispStr(0, 0, dis0);sprintf(dis0, " %7.2fmm ", f_distance[channel-1]);LCD_DispStr(0, 1, dis0);UART_SendStr("AT+CIPSEND=0,21\r\n", 17); //发送数据DelayMs(100);sprintf(dis0, "Channel %02d:%7.2fmm\r\n", (int)channel, f_distance[channel-1]);UART_SendStr(dis0, 21); //发送数据}}}void Measuring(unsigned char channel){static long cnt = 0; //定时器计数TR1 = 0;if (channel == 1){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_distance[0] = (float)cnt * 17 / 100.0 * 1.102; //算出来是mm (g_cnt * 340 / 2) / 1000.0 * 1.102;系数cnt = 0;}else if (channel == 2){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_distance[1] = (float)cnt * 17 / 100.0 * 1.102; //算出来是mm (g_cnt * 340 / 2) / 1000.0 * 1.102;系数cnt = 0; }else if (channel == 3){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_distance[2] = (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;}void Timer0_Init(void) {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TL0 = 0;EA = 1; //总中断打开}void Timer1_Init(void){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TL1 = 0x00;//设置定时初值 50msTH1 = 0x4C;//设置定时初值EA = 1; //总中断打开ET1 = 1; //定时器中断打开TR1 = 1; //定时器开关打开}void Timer1_Interrupt(void) interrupt 3{static unsigned int time_50ms = 0;TL1 = 0x00;//设置定时初值 50msTH1 = 0x4C;//设置定时初值time_50ms++;if (time_50ms >= 40){disFlag = 1;time_50ms = 0;}}/************************* 串口配置 *************************/void UART_Init(void){SCON = 0x50;TH2 = 0xFF;TL2 = 0xFD;RCAP2H = 0xFF; //(65536-(FOSC/32/BAUD)) BAUD = 115200 FOSC = 11059200RCAP2L = 0xFD;/*****************/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}/************************* 串口发送字节 *************************/void UART_SendByte(unsigned char dat) //串口发送单字节数据{unsigned char time_out;time_out = 0;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}/************************* 串口发送字符串 *************************/void UART_SendStr(unsigned char *s, unsigned char length){unsigned char num;num = 0x00;while (num < length) //发送长度对比{UART_SendByte(*s); //放松单字节数据s++; //指针++num++; //下一个++}}void UART_Interrupt(void) interrupt 4 //串行中断服务程序{if (RI)//判断是接收中断产生{RI = 0; //标志位清零}}
仿真演示视频：
/video/BV11Y411F7qa/
实物演示视频：
/video/BV1cr4y1t7HY/
