超声波测距C语言源程序代码
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1 /*{HZ即单位s的倒数}本晶振为12MHZ,因此外部的时钟频率为12MHZ,所以部的时钟频率为(12MHZ)/12=1MH
即1000000HZ,而机械频率为1/(1MHZ),即每完成一次计算(即定时器的值加一)用时0.000001s,
即1us(微秒).*/
/***********************************************************************************/
//具有模式选择.
*include
*define UC unsigned char
*define UI unsigned int
void delay(UI); //延时9.56us程序
sbit beep = P1^3; //用于声音报警
sbit Lv = P1^7; //用于光报警
sbit Hong = P1^6;
sbit QD = P3^7;//K8 //P3^7口(K8)为确定键,
sbit G* = P3^1;//K7 //P3^3口(K2)为修改键,
sbit S* = P3^6;//K6 //P3^2(K3)为测量键.
sbit B* = P3^0;//K5 //个(K7),十(K6),百(K5),三位修改键
sbit a = P1^2;//百位//数码管位选
sbit b = P1^1;//十位
sbit c = P1^0;//个位
sbit trig = P1^4; //方波发射端
sbit echo = P1^5; //超声波接收端
void IntConfiguration(); //用来"设置中断"的函数,P3^3口(K2)为修改键,P3^2(K3)为测量键.
void TimeConfiguration(); //用来"设置定时器"的函数
sbit K1 = P3^4;//动态
sbit K4 = P3^5;//静态//用于进展模式切换(K1、K4键)
void *ia*ian(); //修改函数,用来修改下限
void shang*ian(); //修改函数,用来修改上限
UI min[3]={0,5,0}; //报警极限,拆分为"百十个"三位
UI ma*[3]={3,0,0}; //MIN,MA* 用来存储最大和最小值
void MIN*ianshi(UI); //最小围和最大围的显示
void MA**ianshi(UI);
UC code CharacterCode[10] =
{0*3f,0*06,0*5b,0*4f,0*66,0*6d,0*7d,0*07,0*7f,0*6f};
//数码管数字字符(P2口)
/********************************主函数*********************************************/
void main()
{
TimeConfiguration(); //设置定时器0
IntConfiguration(); //设置中断允许,K4键为修改键,K8键为确定键
while(1)
{ .
1 MIN*ianshi(40); //1.50169000s
MA**ianshi(40); //1.50098300s
}
}
/*******************************超声波测距函数********************************************/
void zhongduan_0() interrupt 0 //测量中断函数(外部中断0)
{
UI moshi = 0;
UI juli = 0;
UI time = 0;
UI MA*, MIN;
UI TT = 0;//用于第一次测量时给P1^5口置一,以便正确读取数值
UI t1, t2, t3;
UI GE = 0, SHI = 0, BAI = 0; //先定义三个变量,用来显示测量的距离.
a = 0;
b = 0;
c = 0;
P2 =~ 0*00; //防止最后显示的那个数码管一直亮
MA* = ma*[0]*100 + ma*[1]*10 + ma*[2]; //计算最大与最小值
MIN = min[0]*100 + min[1]*10 + min[2];
while(1)//下面进展测量
{
while(1) /*先进展模式判断*/
{
if(0 == K1)
{
moshi = 1;
break; //模式1为动态测量
}
if(0 == K4)
{
moshi = 2;
break; //模式2为静态测量
}
if(0 == QD)
return; //完毕测量函数
}
/********************************************计算距离************************************************/
loop: beep = 1;//关掉定时器
Lv = 1;
Hong = 1;//关掉灯
a = 0; .
1 b = 0;
c = 0;
P2 =~ 0*00;//防止最后显示的那个数码管一直亮
if( (0 == QD)&&(1 == moshi) )
break;
if( (0 == QD)&&(2 == moshi) )
{
delay(55500);
if(0 == QD)
{
delay(55500);
if(0 == QD)
break;
}
}
t1 = 35,
t2 = 35;
t3 = 35;
trig = 0;
echo = 0;
delay(2); //初始化拉低两个端口
trig = 1;
delay(2);
trig = 0; //输出端输出27us的高电压,并将输出端口拉低
while(echo == 0); //判断是否有回波返回,有则开启定时器
TR0 = 1; //当有高电平输出时,开启定时器
while(echo == 1);
TR0 = 0; //当高电平变成低电平时,关闭定时器
++TT; //测量值加一,记录测量次数
if(1 == TT)
{
delay(55500);
TH0 = 0*00;TL0 = 0*00; //定时器的初值,定时器的定时为65536us.
goto loop;
}
time = TL0 + TH0*256; //接下来显示测量的距离
TH0 = 0*00;TL0 = 0*00; //定时器的初值,定时器的定时为65536us.
juli = ( int )( (time*0.034)/2 );
BAI = ( (juli%1000)/100 ); SHI = ( (juli%100)/10 ); GE =
( juli%10 );
/******************************************两种模式的距离显示********************************************/ .
1 if(juli > MA*)
{
Hong = 0;
Lv = 1;
while( t1-- )
{
a = 0;
b = 1;
c = 1;
P2 =~ CharacterCode[BAI];
delay(400);
a = 1;
b = 0;
c = 1;
P2 =~ CharacterCode[SHI];
delay(400);
a = 1;
b = 1;
c = 0;
P2 =~ CharacterCode[GE];
delay(390);
beep = 0;
if( (1 == moshi)&&(0 == t1) )
goto loop;
if(moshi == 2)
{
t1 = 2;
if(0 == QD)
goto loop;
}
}
}
else if(juli < MIN)
{
Lv = 0;
Hong = 1;
while( t2-- )
{
a = 0;
b = 1;
c = 1;
P2 =~ CharacterCode[BAI];
delay(500);
a = 1; .
1 b = 0;
c = 1;
P2 =~ CharacterCode[SHI];
delay(500);
a = 1;
b = 1;
c = 0;
P2 =~ CharacterCode[GE];
delay(400);
beep = 0;
delay(100);
beep = 1;
if( (1 == moshi)&&(0 == t2) )
goto loop;
if(2 == moshi)
{
t2 = 2;
if(0 == QD)
goto loop;
}
}
}
else
{
beep = 1;
Lv = 1;
Hong = 1;
while( t3-- )
{
a = 0;
b = 1;
c = 1;
P2 =~ CharacterCode[BAI];
delay(600);
a = 1;
b = 0;
c = 1;
P2 =~ CharacterCode[SHI];
delay(600);
a = 1;
b = 1;
c = 0;
