温度控制程序

#include<reg52.h>

#define uchar unsigned char

#define uint unsigned int

uchar i;

uchar n=0;

int nowtemp;

int highest=900;

int lowest=700;

sbit p20=P2^0;

sbit p30=P3^0;

bit k=0;

bit u=0;

bit j=0;

uchar code wendu[]="0123456789";//利用一个温度表解决温度显示乱码

sbit DQ = P2^1; //定义 ds18B20 总线 IO

void delay(uchar z) //延时子函数

{

uchar x,y;

lcdrw=0;

P1=com;

delay(5);

lcden=1;

delay(5);

lcden=0;

}

void write_date(uchar date) //写入数据函数

{

lcdrs=1;

lcdrw=0;

P1=date;

delay(1);

delay(1);

lcden=0;

}

write_com(0x0c); //开显示;

write_com(0x06); //显示光标移动设置

write_com(0x80); //设置数据地址指针

}

void write_one(char *p)

{

unsigned char i;

write_com(0x80);

for(i=0;p[i]!=0;i++)

{

write_date(p[i]);

void write_two(char *p)

write_com(0x80+0x40);

for(i=0;p[i]!=0;i++)

{

write_date(p[i]);

delay(10);

}

}

write_int(int num)

{

unsigned int bai,shi,ge,xiaoshu; //这里的 num,shi,ge,xiaoshu 必须用

unsigned char d;

else d=0x2B;

if(num<0)num=-num;

bai=num/1000;

shi=num%1000/100;

ge=num%1000%100/10;

write_date(0x2e); //写入小数点

write_date(wendu[xiaoshu]);

write_date(0xDF);

write_date(0x43);

}

void tmpDelay(int num) //延时函数

{

while(num--) ;

}

DQ = 1; //拉高总线

tmpDelay(14);

x=DQ; //稍做延时后 如果 x=0 则初始化成功 x=1 则初始化失败

tmpDelay(20);

}

unsigned char ReadOneChar()//读一个字节

{

unsigned char i=0;

unsigned char dat = 0;

for (i=8;i>0;i--)

{