51单片机+DS18B20+数码管显示+超温提示+Proteus仿真

51单片机+DS18B20+数码管显示+超温提示+Proteus仿真

  • Proteus仿真
    在这里插入图片描述

实例代码

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#include <reg52.h>

#define uchar unsigned char
#define uint unsigned int

sbit we1 = P3^0;
sbit we2 = P3^1;
sbit we3 = P3^2;
sbit we4 = P3^3;
sbit DS = P1^0;

sbit D1 = P3^6;
sbit D2 = P3^7;

uchar qian=0,bai=0,shi=0,ge=0;
uint temp;             // variable of temperature

void delay2(uchar x);    //x\*0.14MS
void dsreset(void);       //send reset and initialization command
bit tmpreadbit(void);       //read a bit
uchar tmpread(void);   //read a byte date
void tmpwritebyte(uchar dat);   //write a byte to ds18b20
void tmpchange(void);  //DS18B20 begin change
uint tmp();               //get the temperature
void fenli(uint temp);	  //分离温度函数
void display(uchar qian,uchar bai,uchar shi,uchar ge);//显示函数
//共阳数码管
uchar code table[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e,0x7f};

void main()
{
	int wendu;
	we1=1;
	we2=1;
	we3=1;
	we4=1;
	
	while(1)
	{
		tmpchange();
		wendu = tmp(); 
		if(wendu>1000){D1=1;D2=0;}
		
		if(wendu<1000){D2=1;D1=0;}
		fenli(wendu);
		
		we1=1;
		P2=table[qian];
		delay2(20);
		we1=0;

		we2=1;
		P2=table[bai];
		delay2(20);
		we2=0;

		we3=1;
		P2=table[shi] & 0x7f;
		delay2(20);
		we3=0;

		we4=1;
		P2=table[ge];
		delay2(20);
		we4=0;	
	}
}

void fenli(uint temp)
{
	qian=temp/1000;
	
	bai=temp/100%10;	//百
	
	shi=temp%100/10;	//十

	ge=temp%10;	//个
}

void delay2(uchar x)    //x\*0.14MS
{
 unsigned char i;
  while(x--)
 {
  for (i = 0; i<13; i++) {}
 }
}

void dsreset(void)       //send reset and initialization command
{						  //发送复位和初始化命令
  uint i;
  DS=0;
  i=103;
  while(i>0)i--;
  DS=1;
  i=4;
  while(i>0)i--;
}

bit tmpreadbit(void)       //read a bit
{
   uint i;
   bit dat;
   DS=0;i++;          //i++ for delay
   DS=1;i++;i++;
   dat=DS;
   i=8;while(i>0)i--;
   return (dat);
}

uchar tmpread(void)   //read a byte date
{
  uchar i,j,dat;
  dat=0;
  for(i=1;i<=8;i++)
  {
    j=tmpreadbit();
    dat=(j<<7)|(dat>>1);   //读出的数据最低位在最前面，这样刚好一个字节在DAT里
  }
  return(dat);
}

void tmpwritebyte(uchar dat)   //write a byte to ds18b20
{
  uint i;
  uchar j;
  bit testb;
  for(j=1;j<=8;j++)
  {
    testb=dat&0x01;
    dat=dat>>1;
    if(testb)     //write 1
    {
      DS=0;
      i++;i++;
      DS=1;
      i=8;while(i>0)i--;
    }
    else
    {
      DS=0;       //write 0
      i=8;while(i>0)i--;
      DS=1;
      i++;i++;
    }

  }
}

void tmpchange(void)  //DS18B20 begin change
{
  dsreset();
  delay2(1);
  tmpwritebyte(0xcc);  // address all drivers on bus
  tmpwritebyte(0x44);  // initiates a single temperature conversion
}

uint tmp()               //get the temperature
{
  float tt;
  uchar a,b;
  dsreset();
  delay2(1);
  tmpwritebyte(0xcc);
  tmpwritebyte(0xbe);
  a=tmpread();		   //低字节
  b=tmpread();		   //高字节
  temp=b;
  temp<<=8;             //two byte compose a int variable
  temp=temp|a;
  tt=temp\*0.0625;
  temp=tt\*10+0.5;		//0.5四舍五入作
  return temp;
}


仿真资源和源码下载

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提取码：kvn1