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#include<reg51.h>
#include<intrins.h>
#include"lcd.h"
sbit Trig = P2^1; //超聲波
sbit Echo = P2^0; //超聲波
sbit BUZZ=P1^5; //蜂鳴器
sbit K1=P3^1; //選擇調(diào)節(jié)high 或者 low
sbit K2=P3^0; //調(diào)節(jié)high/low ++
sbit K3=P3^2; //調(diào)節(jié)high/low --
unsigned char PuZh[]="HIGH LOW";
unsigned char code ASCII[15] = {'0','1','2','3','4','5','6','7','8','9','.','-','M'};
static unsigned char DisNum = 0; //顯示用指針
unsigned int time=0;
unsigned long S=0;
unsigned long tj=0;
unsigned int high=30,low=10; //high：第一次報(bào)警位置 low：第二次報(bào)警位置第二次報(bào)警的蜂鳴器響的時(shí)間較長(zhǎng)
bit flag =0,flag2=0;
unsigned char disbuff[4]={ 0,0,0,0,};
unsigned char self[4]={ 0,0,0,0,};
void delay(unsigned int jj)
{
while(jj--);
}
/*******************************************************************************
* 函數(shù) 名 : main
* 函數(shù)功能 : 主函數(shù)
* 輸入 : 無(wú)
* 輸出 : 無(wú)
*******************************************************************************/
void Conut(void)
{
time=TH0*256+TL0;
TH0=0;
TL0=0;
S=(time*1.7)/100; //算出來(lái)是CM
tj=S;
if((S>=700)||flag==1) //超出測(cè)量范圍顯示“-”
{
flag=0;
DisplayOneChar(0, 1, ASCII[11]);
DisplayOneChar(1, 1, ASCII[10]); //顯示點(diǎn)
DisplayOneChar(2, 1, ASCII[11]);
DisplayOneChar(3, 1, ASCII[11]);
DisplayOneChar(4, 1, ASCII[12]); //顯示M
}
else
{
disbuff[0]=S%1000/100;
disbuff[1]=S%1000%100/10;
disbuff[2]=S%1000%10 %10;
DisplayOneChar(0, 1, ASCII[disbuff[0]]);
DisplayOneChar(1, 1, ASCII[10]); //顯示點(diǎn)
DisplayOneChar(2, 1, ASCII[disbuff[1]]);
DisplayOneChar(3, 1, ASCII[disbuff[2]]);
DisplayOneChar(4, 1, ASCII[12]); //顯示M
self[0]=high/10;
self[1]=high%10;
self[2]=low/10;
self[3]=low%10;
DisplayOneChar(5, 0, ASCII[self[0]]);
DisplayOneChar(6, 0, ASCII[self[1]]);
DisplayOneChar(12, 0, ASCII[self[2]]);
DisplayOneChar(13, 0, ASCII[self[3]]);
}
}
void zd0() interrupt 1 //T0中斷用來(lái)計(jì)數(shù)器溢出,超過(guò)測(cè)距范圍
{
flag=1; //中斷溢出標(biāo)志
}
void StartModule() //啟動(dòng)模塊
{
Trig=1; //啟動(dòng)一次模塊
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
_nop_();
Trig=0;
}
void button()
{
if(K1==0)
{
delay(30);
if(K1==0)
{
flag2=~flag2;
}
}
if(K2==0)
{
delay(20);
if(K2==0)
{
if(flag2==0)
{
high++;
if(high>=100) high=20;
}
else
{
low++;
if(low>=high) low=high;
}
}
}
if(K3==0)
{
delay(20);
if(K3==0)
{
if(flag2==0)
{
high--;
if(high<=low) high=low;
}
else
{
low--;
if(low<=5) low=5;
}
}
}
if(flag2==0)
{
DisplayOneChar(4, 0, 42);
DisplayOneChar(11, 0, 58);
}
else
{
DisplayOneChar(4, 0, 58);
DisplayOneChar(11, 0, 42);
}
}
void delayms(unsigned int ms)
{
unsigned char i=100,j;
for(;ms;ms--)
{
while(--i)
{
j=10;
while(--j);
}
}
}
void bibu()
{
if(tj>=low&&tj<=high)
{
long d=0;
for(d=0;d<=300;d++)
{
BUZZ=1;
delay(100);
BUZZ=0;
}
}
if(tj<low)
{
long d=0;
for(d=0;d<=800;d++)
{
BUZZ=1;
delay(100);
BUZZ=0;
}
}
}
void main(void)
{
TMOD=0x01; //設(shè)T0為方式1，GATE=1；
TH0=0;
TL0=0;
ET0=1; //允許T0中斷
EA=1; //開(kāi)啟總中斷
InitLcd1602();
LcdShowStr(0,0,PuZh);
while(1)
{
StartModule();
while(!Echo); //當(dāng)RX為零時(shí)等待
TR0=1; //開(kāi)啟計(jì)數(shù)
while(Echo); //當(dāng)RX為1計(jì)數(shù)并等待
TR0=0; //關(guān)閉計(jì)數(shù)
Conut(); //計(jì)算
delayms(80);
bibu();
button();
}
}

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