基于51單片機的溫度報警器設(shè)計

主要實現(xiàn)：

? ? 實時溫度測量及顯示，超出溫度范圍聲光報警，上下限溫度可通過按鍵設(shè)定等功能。 本數(shù)字溫度報警器是基于51單片機及溫度傳感器DS18B20來設(shè)計的，溫度測量范圍-55到125.9攝氏度，精度為0.1攝氏度，可見測量溫度的范圍廣，精度高的特點?？赏ㄟ^按鍵設(shè)置上下限報警溫度值，報警設(shè)置范圍0~99攝氏度，默認(rèn)上限報警溫度為40℃、默認(rèn)下限報警溫度為10℃（通過程序可以更改上下限值）。報警值可設(shè)置范圍：最低上限報警值等于當(dāng)前下限報警值，最高下限報警值等于當(dāng)前上限報警值。

uint ReadTemperature();
void convdata();
void xianshi();
void sound();
void czhi();
void sdong();
void show();
void restzhi(); 
void datadisp();//
void jingque(); 
sbit SD=P0^0;	
sbit SET=P0^1; 
sbit Jian=P0^2;	
sbit Jia=P0^3;	   
sbit Md=P0^4; 
sbit p05=P0^5;
sbit p06=P0^6;
sbit p07=P0^7;
sbit CS=P3^0;	
sbit Clk=P3^1;	
sbit DATI=P3^2;	
sbit DATO=P3^2;	 
sbit DQ=P3^3;
sbit Ledzc=P3^4; 
sbit Ledrbj=P3^5; 
sbit Ledybj=P3^6;
sbit Fmbj=P3^7; 
uchar led_mod[]
=

{0xC0,0xF9,0xA4,0xB0,0x99,0x92,0x82,0xF8,0x80,0x90,0xBF,

0xff};
uchar led_com[]={0x08,0x04,0x02,0x01,0x00}; 
uchar tg=0;tflag;//
unsigned char dat0=0x00;   
unsigned char CH=0x00;  
unsigned char dis[]={0, 0, 0}; 
uchar disdata[]={0,10,0,0,0,0};
uchar shezhi[]={0,0,0,0}; 
uchar jque[]={0,0,0,0,0};
int sign=0,js,qo,temp,ywu,ybz;	
int Time=65000; //
int pbi=500,ts=0,ys=0,is=0,ll;	
uint tuxian=30,yuxian=3,temp0; 
void Delay(uint i)	
{
	while( i-- );
}
void delayt(uint time) 
{
	int j;
	for(;time>0;time--)
	for(j=0;j<100;j++);			
}	
void Init_DS18B20(void)	
{	
  uint x=0;  
  DQ=1;	
  Delay(10);  
  DQ=0;      
  Delay(80);   
  DQ=1;       
  Delay(10);
  x=DQ;       
  Delay(20);
}
unsigned char ReadOneChar(void)				 
{
  uint i=0;
  uint dat=0;
  for (i=8;i>0;i--)
  {
    DQ=0;    
    dat>>=1;
    DQ=1;  
    if(DQ);//
    dat|=0x80;
    Delay(4);
  }
  return(dat);
}
void WriteOneChar(uint dat)			 
{
  uint i=0;
  for (i=8; i>0; i--)
  {
    DQ=0;
    DQ=dat&0x01;
    Delay(5);
    DQ=1;
    dat>>=1;
  }
}
void Tmpchange(void)			
{
  Init_DS18B20();
  WriteOneChar(0xCC); 
  WriteOneChar(0x44);  
}
uint ReadTemperature(void)	
{
  uint a=0;
  uint b=0;
  uint t=0;
  float tt=0;
  Tmpchange();
  Init_DS18B20();
  WriteOneChar(0xCC); 
  WriteOneChar(0xBE);  
  a=ReadOneChar();   
  b=ReadOneChar();
  t=b;
  t<<=8;
  t=t|a;
  if(t<0x0fff)
   tflag=0;
    else
   {t=~t+1;
   tflag=1;
   }			
  t=t*(0.0625*10);	
  return(t);
}		   
unsigned char adc0832(unsigned char CH)
{
      unsigned char i,test,adval;
     adval=0x00;
     test=0x00;
     Clk=0;    
     DATI=1;
    _nop_();
    CS=0;
    _nop_();
    Clk=1;
   _nop_();
   if ( CH==0x00 )  
   {
       Clk=0;
       DATI=1;  
       _nop_();
      Clk=1;
        _nop_();
        Clk=0;
      DATI=0;  
      _nop_();
      Clk=1;
      _nop_();
    } 
    else
    {
       Clk=0;
      DATI=1; 
       _nop_();
       Clk=1;
       _nop_();
      Clk=0;
      DATI=1; 
    _nop_();
     Clk=1;
     _nop_();
    }
      Clk=0;
      DATI=1;
    for( i=0;i < 8;i++ )   
    {
       _nop_();
       adval <<=1;
       Clk=1;
       _nop_();
       Clk=0;
       if (DATO)
          adval |=0x01;
      else
          adval |=0x00;
    }
      for (i=0; i < 8; i++)   
      {
           test >>=1;
           if (DATO)
              test |=0x80;
           else 
              test |=0x00;
          _nop_();
          Clk=1;
          _nop_();
          Clk=0;
      }
           dat0=test;
      _nop_();
       CS=1;    
       DATO=1;
       Clk=1;
      return dat0;

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