ds18b20温度测量c51单片机程序源代码

ID:85764 · 发表于 2015-7-15 23:35

数码管显示部分的原理图（开发板中只需要截图显示部分即可）：http://www.51hei.com/f/51hei-5.pdf

电路:ds18b20接在p2.2 数码管用8位共阴极数码管，2个573锁存详见上面的51hei单片机开发板的pdf图，本人测试成了.

程序源代码：

#include<reg51.h>
#define uchar unsigned char
#define uint unsigned int
sbit wela=P2^7;
sbit dula=P2^6;
sbit DS=P2^2;
uchar A;
uint dian;
uchar smg_change[6]={10,10,10,10,10,10};
unsigned char code duanma[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x00};
unsigned char code weima[]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf};
void delay(unsigned int a)
{
while(a--);
}
void init_tempr()
{
uchar n;
DS=1;
delay(8);
DS=0;
delay(80); //500us
DS=1;
delay(8);
n=DS;
delay(4);
}
void write_byte(uchar dat)
{
uchar i;
for(i=0;i<8;i++)
{
DS=0;
DS=dat&0x01;
delay(4);
DS=1;
dat>>=1;
}
delay(4);
}
uchar read_byte(void)
{
uchar i,value;
for(i=0;i<8;i++)
{
DS=0;
value>>=1;
DS=1;
if(DS)
value|=0x80;
delay(4);
}
return value;
}
uchar readtempr(void)
{
uint temp, a,b;
init_tempr();
write_byte(0xcc);
write_byte(0x44);
delay(300);
init_tempr();
write_byte(0xcc);
write_byte(0xbe);
a=read_byte();
b=read_byte();
temp=b;
temp<<=4;
temp+=(a&0xf0)>>4;
dian=(a&0x0f)*10*6/10;
return temp;
}
void display()
{
uchar i;
for(i=0;i<6;i++)
{
P0=0X00;
dula=1;
dula=0;
P0=weima[i];
wela=1;
wela=0;
P0=duanma[smg_change[i]];
dula=1;
dula=0;
delay(200);
}
P0=weima[1];
wela=1;
wela=0;
P0=duanma[smg_change[1]]|0x80;
dula=1;
dula=0;
delay(200);
P0=0X00;
dula=1;
dula=0;
}
void dis_deal()
{
smg_change[0]=A/10;
smg_change[1]= A%10;
smg_change[2]=dian/10 ;
smg_change[3]=dian%10 ;
}
void main()
{
while(1)
{
A=readtempr();
dis_deal();
display();
}
}

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ID:443912 · 发表于 2018-12-11 11:09

你好，为什么我这只显示了两个8啊。根本没有变化

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ds18b20温度测量c51单片机程序 源代码