18b20测温的c语言程序/DS18B20温度传感器程序

#include <reg52.h>

#define Alarm 10

sbit Beep=P3^4

sbit DQ=P2^4 //数据传输线接单片机的相应的引脚

unsigned char tempL=0,tempH=0 //设全局变量

unsigned char flag=0

unsigned int temperature,negtemper //温度值保存在temperature里

unsigned char idata addrdat[2]={0x0,0x0}

unsigned char tab[]={0xc0,0xf9,0xa4,0xb0, /* 0 1 2 3 4 */

0x99,0x92,0x82,0xf8,0x80,0x90} /* 5 6 7 8 9 */

unsigned char tab1[]={0x40,0x79,0x24,0x30,0x19,0x12,0x02,0x78,0x00,0x10}

unsigned char dispbuf[3]={0,0,0}

unsigned char warning=30

bit on=1,off=0 -18b20