单片机ds18b20温度检测电路仿真设计带源码

yxlk · 发表于 2018-12-26 07:30

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单片机ds18b20温度检测电路仿真设计带源码

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分享一个ds18b20传感器检测环境温度，数码管显示并且超过一定温度蜂鸣器蜂鸣报警，下面是部分电路仿真图。
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51单片机源程序：

#include <reg52.h>
#define uchar unsigned char
#define uint unsigned int
sbit DS=P2^2;          //define inteRFace
uint temp;          // variable of temperature
uchar flag1;          // sign of the result positive or negative
sbit wela1=P2^4;             //段选信号的锁存器控制
sbit wela2=P2^5;
sbit wela3=P2^6;             //段选信号的锁存器控制
sbit wela4=P2^7;             //位选信号的锁存器控制
sbit beep=P2^3;
unsigned char code table[]={0xC0,0xf9,0xa4,0xb0,0x99,0x92,0x82,
                     0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e};
unsigned char code table1[]={0xbf,0x86,0xdb,0xcf,0xe6,0xed,0xfd,
                     0x87,0xff,0xef};

void delay(uint count)    //delay
{
  uint i;
  while(count)
  {
i=200;
while(i>0)
i--;
count--;
  }
}
void dsreset(void)    //send reset and initialization command
{
  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();
  delay(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();
  delay(1);
  tmpwritebyte(0xcc);
  tmpwritebyte(0xbe);
  a=tmpread();
  b=tmpread();
  temp=b;
  temp<<=8;          //two byte  compose a int variable
  temp=temp|a;
  tt=temp*0.0625;
  temp=tt*10+0.5;
  return temp;
}

void display(uint temp)                      //显示程序
{

uchar A1,A2,A2t,A3;
A1=temp/100;
A2t=temp%100;

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