單片機超聲波測距原理圖

#include
#define csboutP3_5//超聲波發送
#define csbintP3_7 //超聲波接收
#define csbc=0.034
#define bgP3_4
unsigned char csbds,opto,digit,buffer[3],xm1,xm2,xm0,key,jpjs,ki;//顯示標識
unsigned char convert[10]={0x3F,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f};//0~9段碼
unsigned int s,t,i,sj1,sj2,sj3,mqs,sx1,sjtz,sja,sjb;
bit cl;

void csbcj();
void delay(i);//延時函數
void scanLED();//顯示函數
void showOnce();//顯示循環函數
void timeToBuffer();//顯示轉換函數
void offmsd();

void main()//主函數
{
EA=1;//開中斷
TMOD=0x11; //設定時器0為計數，設定時器1定時
ET0=1; //定時器0中斷允許
ET1=1; //定時器1中斷允許
TH0=0x00;
TL0=0x00;
TH1=0x9E;
TL1=0x57;
csbds=0;
csbint=1;
csbout=1;
cl=0;
opto=0xff;
sj1=40;
sj2=100;
sj3=150;
ki=0;
TR1=1; //設定時值1為20ms
while(1)
{
csbcj();//調用超聲波測距程序
if(s>sj3)//大于時顯示"CCC"
{
buffer[2]=0x39;
buffer[1]=0x39;
buffer[0]=0x39;
}
else if(s//小于時顯示"- - -"
{
buffer[2]=0x40;
buffer[1]=0x40;
buffer[0]=0x40;
}
else timeToBuffer();//調用轉換段碼功能模塊
offmsd();//調用判斷百位數為零模塊，百位為零時不顯示
scanLED();//調用顯示函數
}
}