基于51单片机的超声波测距程序 Proteus仿真图 -

#include <REGX52.H>
#include "LCD1602.h" //LCD1602头文件
#include "Delay.h" //延时
#include "Timer0.h" //定时0头文件
#include "Timer1.h" //定时1头文件
//定义各种参数
unsigned short Distance;
unsigned char i;
unsigned long DisH,DisL;
unsigned int T0Count;
unsigned char Time;
unsigned int a,b;
sbit Trig = P3^6; //定义两个超声波管脚
sbit Echo = P3^7;
sbit set = P3^0; //切换模式
sbit up = P3^1; //加
sbit down = P3^2; //减
sbit yled = P2^1;
sbit gled = P2^2;
sbit rled = P2^3;
sbit beep = P3^5;
unsigned char Flag;//测量标志位0.5秒触发一次
unsigned char nodis;//超出量程
unsigned int mode;
unsigned int change;
unsigned int waring;
unsigned int upper = 120;//上限
unsigned int lower = 50;//下限
//超声波初始化
void Super_Wave_Init()
{
Trig = 0;
Echo = 0;
}
//
/**************************************************
距离测量
**************************************************/
void Measure(void)
{
unsigned char Err; //错误标记
unsigned long distance,pTime;//距离,时间变量
Err=0;
Trig=1; //TR保持10us高电平触发模块测距
Delay10Us();
Trig=0;
TH0=0;
TL0=0;
while(Echo==0);//等待ECHO变为高
TR0=1; //启动定时器，外部高电平触发
while(Echo==1)//等待超声波回应获超时
{
pTime=TH0*256+TL0;
if(pTime>40000)//时间超时
{
Err=1;
break;
}
}
TR0=0;//关闭定时器
pTime=TH0*256+TL0; //获取时间
if(Err==0)
{
distance=(pTime*173)/1000;//；pTime*346/1000000/2=pTime*0.0173 仿真的环境温度为25度346m/s
DisH = distance/10;
DisL = distance%10;
if((DisH>170)||(DisH<2))//量程170cm，超过量程显示0;测量距离小?cm,HCSR04最小测算2cm
{
Err=1;
}
else if(DisH>upper)
{
gled = 0;
yled = 1;
rled = 1;
beep = 1;
}
else if((DisH>=lower)&&(DisH<=upper))
{
gled = 1;
yled = 0;
rled = 1;
if(waring == 0)
{
beep = 1;
}
else
{
beep = 0;
}
}
else if(DisH<lower)
{
gled = 1;
yled = 1;
rled = 0;
beep = 0;
if(waring == 0)
{
LCD_ShowString(2,1,"warning");
}
else
{
LCD_ShowString(2,1," ");
}
}
}
if(Err == 1)
{
nodis = 1;
gled = 1;
yled = 1;
rled = 1;
beep = 1;
}
}
void outkey()
{
if(set == 0)
{
//Delay(8);
mode++;
change = 1;
if(mode>2)
{
mode = 0;
}
while(set == 0);
}
switch(mode)
{
case 0://正常读数模式
if(change == 1)
{
change = 0;
LCD_ShowString(1,1,"distance:");
LCD_ShowString(1,15,"cm");
LCD_ShowString(1,13,".");
LCD_ShowString(2,1," ");
}
if(Flag)//每500ms测量一次
{
Flag=0;
Measure();//测量
if(nodis == 0)
{
LCD_ShowNum(1,10,DisH,3);
LCD_ShowNum(1,14,DisL,1);
}
else
{
nodis = 0;
LCD_ShowString(1,10,"-");
LCD_ShowString(1,11,"-");
LCD_ShowString(1,12,"-");
LCD_ShowString(1,14,"-");
}
}
break;
case 1://改下限
if(change == 1)
{
change = 0;
LCD_ShowString(2,1,"upper:");
LCD_ShowNum(2,7,upper,3);
LCD_ShowString(2,10," ");
LCD_ShowString(1,1,"lower:");
LCD_ShowNum(1,7,lower,3);
LCD_ShowString(1,10," ");
}
if(up == 0)
{
lower++;
LCD_ShowNum(1,7,lower,3);
while(up == 0);
}
if(down == 0)
{
lower--;
LCD_ShowNum(1,7,lower,3);
while(down == 0);
}
break;
case 2://改上限
if(change == 1)
{
change = 0;
LCD_ShowString(2,1,"upper:");
LCD_ShowNum(2,7,upper,3);
LCD_ShowString(2,10," ");
LCD_ShowString(1,1,"lower:");
LCD_ShowNum(1,7,lower,3);
LCD_ShowString(1,10," ");
}
if(up == 0)
{
upper++;
LCD_ShowNum(2,7,upper,3);
while(up == 0);
}
if(down == 0)
{
upper--;
LCD_ShowNum(2,7,upper,3);
while(down == 0);
}
break;
default:break;
}
}
//主函数
void main()
{
LCD_Init();
Timer0Init(); //该定时器没有写TR0.
Timer1Init();
LCD_ShowString(1,1,"distance:");
LCD_ShowString(1,15,"cm");
LCD_ShowString(1,13,".");
while(1)
{
outkey();
}
}
/**************************************************
定时器1中断服务
**************************************************/
void Time1_Isr() interrupt 3
{
static unsigned char value; //定时2ms中断一次
TH1 = (65536-2000)/256;
TL1 = (65536-2000)%256; //2ms
// smgDis(); //数码管显示函数
value++;
if(value >= 250)//250次2ms中断总时间位500ms
{
value = 0;
Flag = 1;
waring ++;
}
if(waring>1)
{
waring = 0;
}
}

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