DS18B20溫度讀取及顯示

1、DS18B20溫度讀取及顯示#include#define uchar unsigned char #define uint unsigned int#define wela P2#define dula P0uchar code table=0x3f,0x06,0x5b,0x4f, 0x66,0x6d,0x7d,0x07,0x7f,0x6f;sbit DS=P37;void delay6us(uchar z)while(z-);void delayms(uchar z)uchar i,j;for(i=0;iz;i+)for(j=0;j160;j+); void init()uchar pre

2、sence=1;while(presence) DS=0;delay6us(80);/延時480us以上DS=1;delay6us(15);if(DS=0)presence=0;while(DS=0);else presence=1;uchar ds_read()uchar byt,bi;uchar i;for(i=0;i1)|(bi7);delay6us(11);return byt;void ds_write(uchar ch)uchar i;for(i=0;i=1;void DSchange()DS=1;init();ds_write(0xcc);ds_write(0x44);void

3、DSreadtempcom()DS=1;init();ds_write(0xcc);ds_write(0xbe);uint DSreadtemp()int temp=0;uchar tmh,tml;DSchange();delayms(1);DSreadtempcom();tml=ds_read();tmh=ds_read();DS=1;temp=tmh;temp=8;temp|=tml;return temp;void display(uint wendu)uchar bai,shi,ge,sfen,bfen,qfen;uchar s,tp,th,tl;uint xs,flag;flag=w

4、endu&0x8000;if(flag!=0)wendu=(wendu-1);th=wendu/256;tl=wendu%256;s=tl&0x0f;xs=0.0625*s*1000;th=4;tp=th|tl;bai=tp/100;shi=(tp%100)/10;ge=tp%10;sfen=xs/100;bfen=(xs%100)/10;qfen=xs%10; /顯示的百位十位個位以及小數(shù)點后三位wela=0;if(flag!=0)dula=0x40;/顯示負號elsedula=0x00;delayms(10);wela=1;if(bai!=0)dula=tablebai;elsedula=0x00;delayms(10);wela=2;dula=tableshi;delayms(10);wela=3;dula=tablege|0x80; /加小數(shù)點delayms(10);wela=4;dula=tablesfen;delayms(10);wela=5;dula=tablebfen;delayms(10);wela=6;dula=tableqfen;d