51单片机数字温度计程序

1、#includedefineuchaiunsignedchardefineumtunsignedmtsbitDS=P2A2;/defineinterfaceuiiittemp;/variableoftemperatureuchaiflagl;/signoftheresultpositiveornegativesbitdula=P2A6;sbitwela=P2A7;unsignedcharcodetable=0 x3f,0 x06,0 x5b,0 x4f,0 x66.0 x6d.0 x7d,0 x07,0 x7f.0 x6f0 x77.0 x7c,0 x39,0 x5e.0 x79,0 x71;

2、/带小数点的unsignedcharcodetablel=0 xbf.0 x86.0 xdb,0 xcf0 xe6,0 xed,0 xfd,0 x87,0 xff,0 xef;不带小数点的voiddelay(uintcount)/delayuiiiti;wliile(count)1=200;wlule(i0)i-Scount;voiddsreset(void)/sendresetandmitializationcoininand/DS18B20复位，初始化函数uiiiti;DS=0;1=103;wliile(i0)i;DS=1;1=4;wliile(i0)i;bittmpreadbit(voi

3、d)/readabit/读1位数据函数uiiiti;bitdat;DS=0;i+;/i+fordelayDS=l;i+;i+;dat=DS;i=8;wliile(i0)i-;return(dat);uchaitmpread(void)/readabytedate/读一个字节数据函数uchaiij,dat;dat=O:fbr(i=i;i=8;i+)j=tmpreadbitQ;dat=(j7)|(datl);读出的数据最低位在最前面，这样刚好一个字节在dat里retum(dat);voidtmpwritebyte(uchardat)/writeabytetodsl8b20/7向DS18B20写一个

4、字节数据函数umti;uchaij;bittestb;for(j=l;j0)i-;elseDS=0;/write0i=8;wliile(i0)i-;DS=1;i+;i+;voidtmpchange(void)/DS18B20begmchange/DS18B20开始获取温度并转换dsresetQ;delay(l);tmpwiitebyte(Oxcc);/addressalldriversonbustmpwiitebyte(0 x44);/nutiatesasingletempeiatureconversionumttmpQ/getthetemperatuie/读取寄存器中存储的温度数据float

5、tt;uchaia,b;dsreset();delay(l);tmpwritebyte(Oxcc);tmpwritebyte(Oxbe);a=tmpreadQ;b=tmpieadQ;temp=b;temp=8;/twobytecomposeaiiitvaiiabletemp=temp|a;tt=temp*0.0625;/温度在寄存器中为12位，分辨率为0.0625temp=tt*10+0.5/乘以10表示小数点后面只取1位，加0.5是四舍五入returntemp;voidreadiomQ/readtheserial/读ROMuchaisnhsii2;dsreset();delay(l);tmp

6、writebyte(0 x33);snl=tmpieadQ;sn2=tmpieadQ;voiddelaylOmsQ/delayuchaia,b;fbi(a=10;a0;a)fbi(b=60;b0;b-);_voiddisplav(umttemp)/显示程序uchaiAl,A2,A2t,A3;Al=temp/100;A2t=temp%100;A2=A2t/10;A3=A2t%10;dula=0;PO=tableAl;显示百位dula=l;dula=0;wela=0;P0=0 x7e;wela=l;wela=O;delay(l);dula=O;P0=tablelA2;显示十位diila=l;dula=O;wela=O;P0=0 x7d;wela=l;wela=O;delay(l);P0=tableA3;显示个位diila=