51单片机超声波模块的C语言程序

//超声波模块程序
//超声波模块程序
//Trig = P2^0
//Echo = P3^2
#include <reg52.h>
#define uchar unsigned char
#define uint unsigned int
int time;
int succeed_flag;
uchar timeL;
uchar timeH;
sbit Trig=P1^0;
sbit Echo=P3^2;
uchar code
table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f, 0x6f};
uchar code table1[]={0,1,2,3,4,5,6,7};
//
void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=110;y>0;y--);
}
//
void delay_20us()
{
uchar a ;
for(a=0;a<100;a++);
}
//***************************************************** **********
//显示数据转换程序
void display(uint temp)
{
uchar ge,shi,bai;
bai=temp/100;
shi=(temp%100)/10;
ge=temp%10;
P2=table1[2];
P0=table[ge];
delay(1);
P2=table1[1];
P0=table[shi];
delay(1);
P2=table1[0];
P0=table[bai];
delay(1);
}
//***************************************************** **********
void main()
{
uint distance;
// test =0;
Trig=0; //首先拉低脉冲输入引脚
EA=1; //打开总中断0
TMOD=0x10; //定时器1，16位工作方式
while(1)
{
EA=0; //关总中断
Trig=1; //超声波输入端
delay_20us(); //延时20us
Trig=0; //产生一个20us的脉冲
while(Echo==0); //等待Echo回波引脚变高电平 succeed_flag=0; //清测量成功标志
EA=1;
EX0=1; //打开外部中断0
TH1=0; //定时器1清零
TL1=0; //定时器1清零
TF1=0; //计数溢出标志
TR1=1; //启动定时器1
delay(20); //等待测量的结果
TR1=0; //关闭定时器1
EX0=0; //关闭外部中断0
if(succeed_flag==1)
{
time=timeH*256+timeL;
distance=time*0.0172; //厘米
}
if(succeed_flag==0)
{
distance=0; //没有回波则清零
// test = !test; //测试灯变化 }
display(distance);
}
}
//***************************************************** **********
//外部中断0，用做判断回波电平
void exter() interrupt 0 // 外部中断0是0号
{
EX0=0; //关闭外部中断
timeH =TH1; //取出定时器的值
timeL =TL1; //取出定时器的值
succeed_flag=1;//至成功测量的标志
}
//***************************************************** ***********
//定时器1中断,用做超声波测距计时
void timer1() interrupt 3 //
{
TH1=0;
TL1=0;
}
1602液晶显示的超声波模块程序
接口程序里边都有、、
#include<reg52.h>
//#include<delay.h>
#include <intrins.h>
#define uchar unsigned char
#define uint unsigned int
sbit lcdrs=P2^3;
sbit lcden=P2^2;
sbit trig=P2^0; //超声波发送//sbit echo=P3^2; //超声波接受//P0____________DB0-DB7
uchar dis[]="Disp_HC-SR04";
uchar num[]="0123456789";
uint distance;
void delay(uint z)
{
uint x,y;
for(x=z;x>0;x--)
for(y=121;y>0;y--);
}
void HC_init()
{
TMOD=0x09;
TR0=1;
TH0=0;TL0=0;
}
uint HC_jisuan()
{
uint dist,timer;
timer=TH0;
timer<<=8;
timer=timer|TL0;
dist=timer/53; //晶振11.0592MHz 距离cm=微秒us/58
return dist; //1个机器周期是12个时钟周期 timer*12/(58*11.0592)=timer/53
}
void HC_run()
{
uint tempH=0x00,tempL=0x00;
TH0=0;TL0=0;
trig=0;
trig=1;
delay(1);
trig=0;
while((TH0-tempH!=0||TL0-
tempL!=0)||(TH0==0&&TL0==0))
{
tempH=TH0;
tempL=TL0;
}
delay(1);
}
void lcd_write_com(uchar com) //LCD写指令{
lcdrs=0;
P0=com;
delay(1);
lcden=1;
delay(1);
lcden=0;
}
void lcd_write_data(uchar date) //LCD写数据{
lcdrs=1;
P0=date;
delay(1);
lcden=1;
delay(1);
lcden=0;
}
void lcd_init() //LCD初始化{
lcden=0;
lcd_write_com(0x38);
lcd_write_com(0x0c);
lcd_write_com(0x06);
lcd_write_com(0x01); }
void lcd_display(uchar temp) {
uint i;
for(i=0;i<12;i++)
{
lcd_write_data(dis[i]);
}
lcd_write_com(0x80+0x41);
lcd_write_data('D');
lcd_write_data('i');
lcd_write_data('s');
lcd_write_data('t');
lcd_write_data('a');
lcd_write_data('n');
lcd_write_data('c');
lcd_write_data('e');
lcd_write_data(':');
lcd_write_data(num[temp/100]);
lcd_write_data(num[temp/10%10]);
lcd_write_data(num[temp%10]);
lcd_write_data('m');
}
void main()
{
lcd_init();
HC_init();
while(1)
{
HC_run();
distance=HC_jisuan();
lcd_display(distance);
delay(200);
}
}。