名称：超声波测距

作者：Acebit本文引用地址：http://www.eepw.com.cn/article/201611/320529.htm

信息：STC10F08单片机，晶振11.0592MHZ；超声波模块HM55B，测距范围1米；

LCD1602，串行发送数据，显示单位mm；

#include "def.h" //定义管脚

#include "reg51.h"

#include#ifndef OSC110592

#define OSC110592

#endif

unsigned int qian,bai,shi,ge;

unsigned int k;

long result;

void init();

void PULSOUTus(unsigned int port);

bit Read_Port(unsigned int port);

void Write_Port(unsigned int port,bit state);

bdata unsigned char SBUF1;

sbit SBUF1_bit0 = SBUF1^0;

sbit SBUF1_bit1 = SBUF1^1;

sbit SBUF1_bit2 = SBUF1^2;

sbit SBUF1_bit3 = SBUF1^3;

sbit SBUF1_bit4 = SBUF1^4;

sbit SBUF1_bit5 = SBUF1^5;

sbit SBUF1_bit6 = SBUF1^6;

sbit SBUF1_bit7 = SBUF1^7;

void init() //initialization

{

TMOD=0x12;

PCON=00;

TR1=0;

TF1=0;

TR0=0;

TF0=0;

ET1=0;

ET0=0;

EA=0;

}

void delay_ms(unsigned int i)//延时子程序

{

unsigned int j;

for(;i>0;i--)

for(j=0;j<125;j++);

}

void putchar(char input) //模拟串口9600波特率，向LCD发送数据

{

SBUF1=input;

TL0=160;

TH0=160;

TF0=0;

TR0=1;

P26 = 0; //strat

while(!TF0);

TF0=0;

P26 = SBUF1_bit0; //0

while(!TF0);

TF0=0;

P26 = SBUF1_bit1; //1

while(!TF0);

TF0=0;

P26 = SBUF1_bit2; //2

while(!TF0);

TF0=0;

P26 = SBUF1_bit3; //3

while(!TF0);

TF0=0;

P26 = SBUF1_bit4; //4

while(!TF0);

TF0=0;

P26 = SBUF1_bit5; //5

while(!TF0);

TF0=0;

P26 = SBUF1_bit6; //6

while(!TF0);

TF0=0;

P26 = SBUF1_bit7; //7

while(!TF0);

TF0=0;

P26 = 1; //end

while(!TF0);

TF0=0;

TR0=0;

}

void PULSOUTus(unsigned int port)//HM55B启动脉冲

{

Write_Port(port,1);

_nop_();

_nop_();

_nop_();

_nop_();

_nop_();

_nop_();

_nop_();

_nop_();

_nop_();

_nop_();

_nop_();

Write_Port(port,0);

}

void Write_Port(unsigned int port,bit state)

{

switch (port)

{

case 0: P00=state;break;

case 1: P01=state;break;

case 2: P02=state;break;

case 3: P03=state;break;

case 4: P04=state;break;

case 5: P05=state;break;

case 6: P06=state;break;

case 7: P07=state;break;

case 8: P20=state;break;

case 9: P21=state;break;

case 10:P22=state;break;

case 11:P23=state;break;

case 12:P24=state;break;

case 13:P25=state;break;

case 14:P26=state;break;

case 15:P27=state;break;

}

}

//main program

void main()

{

init();

while(1)

{

TL1=0;

TH1=0;

Write_Port(15,0);

PULSOUTus(15);

Write_Port(15,1);

while(P27==0); //测回波时间

TR1=1;

while(P27==1);

TR1=0;

result=TH1*256+TL1;

result=result*0.187-150; //距离计算

k=(int)result;

putchar(22);//显示

putchar(12);

delay_ms(100);

qian=k/1000+48;

bai=(k00)/100+48;

shi=(k00)0/10+48;

ge=(k00)0+48;

putchar(qian);

putchar(bai);

putchar(shi);

putchar(ge);

putchar(m);

putchar(m);

delay_ms(500);

}

}