51单片机超声波模块的C语言程序.docx

1、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 = P20/Echo = P32#include #define uchar unsigned char#define uint unsigned intint time;int succeed_flag;uchar timeL;uchar timeH;sbit Trig=P10;sbit Echo=P32;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

2、 delay(uint z) uint x,y; for(x=z;x0;x-) for(y=110;y0;y-);/void delay_20us() uchar a ; for(a=0;a100;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=table12; P0=tablege; delay(1); P2=table11; P0=tableshi; delay(1); P2=table10; P0=tablebai; dela

3、y(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; /

4、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;

5、 /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/#include#include #define uchar unsigned char#define uint unsigned intsbit lcdrs=P23;sbit lcden=P22;sbit trig=P20; /超声波发送/sbit echo=P32; /超声波接受/P0_D

6、B0-DB7uchar dis=Disp_HC-SR04;uchar num=0123456789;uint distance;void delay(uint z)uint x,y;for(x=z;x0;x-)for(y=121;y0;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

7、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;v

8、oid 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; lcd_write_com(0x82); for(i=0;i12;i+) lcd_write_data(d

9、isi); 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(numtemp/100); lcd_write_data(numtemp/10%10); lcd_write_data(numtemp%10); lcd_write_data(c); lcd_write_data(m); void main() lcd_init(); HC_init(); while(1) HC_run(); distance=HC_jisuan(); lcd_display(distance); delay(200);