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標(biāo)題: 18b20+數(shù)碼管溫度顯示 [打印本頁(yè)]

作者: LIZAN66 時(shí)間: 2017-7-28 16:24
標(biāo)題: 18b20+數(shù)碼管溫度顯示
#include<reg52.h>
#define uint unsigned int
#define uchar unsigned char
sbit d=P3^7; //定義18B20數(shù)據(jù)腳
uchar code wu[]={0x7f,0xbf,0xdf,0xef,0xf7,0xfb,0xfd,0xfe}; //數(shù)碼管位選
uchar code du[]={
0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,  //數(shù)碼管段選
0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10,
0xff,0xbf
};
uchar str[5];
void delayms(int z)
{
uint y;
for(;z>0;z--)
for(y=110;y>0;y--);
}
void display(uchar d1,uchar d2)  //顯示函數(shù)
{
P1=wu[d1];
P0=du[d2];
delayms(1);
P0=0xff;
}
void delay(int z)
{
while(z--);
}

  /************** 初始化b20********** */
void reset()
{
d=1;
delay(8);
d=0;
delay(85);
d=1;
delay(35);
}
/************** 寫(xiě)一個(gè)字節(jié) ************/
void write_b20(uchar dat)
{
uchar i;
for(i=0;i<8;i++)
{
  d=0;
  d=dat&0x01;
  delay(5);
  d=1;
  dat>>=1;
}
delay(4);
}
/***************  讀一個(gè)字節(jié) *****************/
uchar read_b20()
{
uchar i,dat;
for(i=0;i<8;i++)
  {
  d=1;
d=0;
  dat>>=1;
  d=1;
  if(d==1)
  dat|=0x80;
  delay(4);
  }
  return dat;
}
/********** 啟動(dòng)溫度轉(zhuǎn)換 ************/
void write_com()
{
reset();
write_b20(0xcc);
write_b20(0x44);
}
/*************** 讀溫度 *****************/
int read_temper()
{
int temper;
uchar a,b;
reset();
write_b20(0xcc);
write_b20(0xbe);
EA=0;
a=read_b20();
b=read_b20();
EA=1;
temper=b;
temper<<=8;
temper|=a;
temper*=0.625;
return temper;
}
void main()
{
int temper;
uchar i,j;
ES=1;

while(1)
  {
write_com();
  for(j=0;j<150;j++)
  {
for(i=0;i<5;i++)
display(i,str[i]); //數(shù)碼管掃描
  }
  temper=read_temper();
  if(temper<0)
{
str[4]=21;
temper=~temper+1;
}
  else
{
str[4]=20;    //第五位數(shù)碼管不顯示
}
str[3]=temper/1000;
str[2]=temper/100%10;
str[1]=temper/10%10+10; //顯示數(shù)字帶小數(shù)點(diǎn)
str[0]=temper%10;

  }
}

作者: yang1114 時(shí)間: 2019-3-18 15:05
求原理圖

作者: yang1114 時(shí)間: 2019-3-18 15:07
求原理圖大哥

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