chaoshengboceju.rar_声波定位硬件_换能器_超声探头定位_超声波定位_超声波探头

#include <AT89X52.H> unsigned char code displaybit[]={0xfe,0xfd,0xfb,0xf7, //位显代码 0xef,0xdf,0xbf,0x7f}; unsigned char code displaycode[]={0xFC,0x60,0xDA,0xF2,0x66,0xB6,0xBE,0xE0, //数码管显示代码 0xFE,0xF6,0xEE,0x3E,0x9C,0x7A,0x9E,0x8E}; unsigned char b,c=0,tab[8]={0,0,0,0,0,0,0,0},displaycount=4; unsigned long a,d,e=17; #define AlarmH 120 // 报警上限 #define AlarmL 10 // 报警下限 sbit KEY1=P1^4; //按键1继续测量 sbit KEY2=P1^5; //按键2停止测量 sbit Beed=P1^0; //蜂鸣器 sbit LED =P1^3; //发光二极管 bit nSTOP=1; void timer0(void) interrupt 1 using 0 {TH0=0xff;TL0=0xfc; if(b==1) {P1_2=~P1_2;} } unsigned char aa; //控制每次测量之间的时间间隔 void EX0INT(void) interrupt 0 using 0 { a=TH1*256+TL1-50; //减去误差 EX0=0;//禁止外中断 b=0;TR1=0;//TR2=0; LED=~LED; d=a*e; d=d/1000-1; tab[4]=d/1000; tab[5]=d%1000/100; tab[6]=d%100/10; tab[7]=d%10; if((d>AlarmH)||(d<AlarmL))Beed=0;else Beed=1; } void delay(unsigned int tt) { while(tt--); } //显示子程序 void xianshi(void) { if(displaycount==5) { P0=displaycode[tab[displaycount]]|0x01; } else { P0=displaycode[tab[displaycount]]; } P2=displaybit[displaycount]; displaycount++; delay(50); if(displaycount==8) { displaycount=4; } } //键盘扫描程序 void keyscan(void) { if(KEY1==0) { delay(100); if(KEY1==0) { Beed=0;nSTOP=1;//蜂鸣器响，继续测量 while(KEY1==0); Beed=1;//关蜂鸣器 } } if(KEY2==0) { delay(100); if(KEY2==0) { Beed=0;nSTOP=0; //蜂鸣器响，停止测量， while(KEY2==0);Beed=1;//关蜂鸣器 } } } void main(void) { TMOD=0x11; TH0=0xff;TL0=0xf3; EA=1;EX0=0;ET0=1;ET1=1;TR0=1;TR1=0;P3_2=1;b=0;IT0=0;//IT0=0;//--为电平出发 nSTOP=1; while(1) { keyscan(); //调用keyscan()按键扫描程序 aa++; if((aa>60) && nSTOP) { aa=0; Beed=1; EX0=1;//允许外中断 b=1; TR1=1; TH1=0x00; TL1=0x00; } xianshi();//调用显示子程序 } }