CT107D_sonic超聲波_查詢(xún)法

1、/sonic 超聲波 發(fā)送器件輸入端接P10 接收器件輸出端P11/發(fā)送器件輸入端需要輸入40KHZ的方波 并在發(fā)送開(kāi)始時(shí)打開(kāi)計(jì)數(shù)器/接受器件在接收到40KHZ的方波時(shí) 輸出端輸出低電頻#include<reg52.h>#include"12864.h"#define rst573 P2&=0x1f#define ledY4C P2|=0x80#define beeY5C P2|=0xa0#define smgY6C P2|=0xc0#define smgY7C P2|=0xe0sbit P06=P06;sbit P36=P36;sbit Tsonic=

2、P10;sbit Rsonic=P11;unsigned int distance=0;float n=0.172;unsigned char table=0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x83,0xf8,0x80,0x98,0xbf;void init_timer0()TMOD=0x01;TH0=0;TL0=0;EA=1;ET0=1;void timer0() interrupt 1distance=0;void delaynms(unsigned int ms)unsigned int x,y;for(x=ms;x;x-)for(y=110;y;y-);voi

3、d delay4us();void init107()rst573;P36=0;/ledP0=0xff;ledY4C;rst573;/beeP06=0;beeY5C;rst573;/smgP0=0x00;smgY6C;rst573;/*void smg(unsigned char aa,unsigned char bb,unsigned char cc,unsigned char dd)if(aa=0&&bb=0&&cc=0&&dd=0)aa=10;bb=10;cc=10;dd=10;/aaP0=0x01;smgY6C;rst573;P0=tab

4、leaa;smgY7C;rst573;delaynms(5);/bbP0=0x02;smgY6C;rst573;P0=tablebb;smgY7C;rst573;delaynms(5);/ccP0=0x04;smgY6C;rst573;P0=tablecc;smgY7C;rst573;delaynms(5);/ddP0=0x08;smgY6C;rst573;P0=tabledd;smgY7C;rst573;delaynms(1);*/void four12864(unsigned char aa,unsigned char bb,unsigned char cc,unsigned char d

5、d)com12864(0x80);dat12864(aa+'0');dat12864(bb+'0');dat12864(cc+'0');dat12864(dd+'0');void sonic()unsigned char sign;TR0=1;sign=1;while(Rsonic)Tsonic=sign;sign=!sign;delay4us();TR0=0;distance=(int)(TH0*256+TL0)*n);TH0=0;TL0=0;void main()unsigned int distance1;init107()

6、;init_timer0();init12864();while(1)sonic();if(distance)if(distance!=distance1)distance1=distance;four12864(distance%10000/1000,distance%1000/100,distance%100/10,distance%10);delaynms(300);/smg(distance%10000/1000,distance%1000/100,distance%100/10,distance%10);/*12864.c*/#include<reg52.h>#inclu

7、de"12864.h"sbit rs=P20;sbit w=P21;sbit en=P12;sbit psb=P26;extern void delay4us();extern voidinit107();extern void delaynms(unsigned int ms);void com12864(unsigned char com)unsigned char temp;psb=1;/para put indors=0;w=1;en=1;delaynms(1);temp=P0;while(temp&0x80);rs=0;w=0;P0=com;en=1;de

8、laynms(1);en=0;delaynms(1);void dat12864(unsigned char dat)unsigned char temp;psb=1;/para put indors=0;w=1;en=1;delaynms(1);temp=P0;while(temp&0x80);rs=1;w=0;P0=dat;en=1;delaynms(1);en=0;delaynms(1);void init12864()psb=1;/para put incom12864(0x30);com12864(0x02);com12864(0x04);com12864(0x01);/*112864.