單片機(jī)ds18b20溫度測(cè)量proteus仿真

1、#includesbitDQ=P3八0;unsignedinttemp;unsignedchardis4=0,0,0,0;unsignedcharled=0 xc0,0 xf9,0 xa4,0 xb0,0 x99,0 x92,0 x82,0 xf8,0 x80,0 x90,0 x88,0 xff,0 xbf;/分別為0-9,不顯示，負(fù)號(hào)Unsignedcharled110=0 x40,0 x79,0 x24,0 x30,0 x19,0 x12,0 x02,0 x78,0 x00,0 x10;/帶小數(shù)點(diǎn)顯示voiddelay(unsignedinti)/如果i是unsigendchar類(lèi)型，則會(huì)

2、出現(xiàn)錯(cuò)誤結(jié)果while(i-);voidInit(void)/初始化/unsignedcharflag=0;DQ=0;/單片機(jī)將DQ拉低delay(100);/精確延時(shí)大于480us小于960usDQ=1;/拉高總線(xiàn)delay(30);flag=DQ;稍做延時(shí)后如果flag=0則初始化成功flag=1則初始化失敗/delay(20);unsignedcharRead(void)/讀字節(jié)unsignedchari=0;unsignedchardat=0;for(i=8;i0;i-)DQ=0;/給脈沖信號(hào)dat=1;DQ=1;/給脈沖信號(hào)if(DQ)dat|=0 x80;delay(5);retu

3、rn(dat);voidWrite(unsignedchardat)/寫(xiě)字節(jié)unsignedchari=0;for(i=8;i0;i-)DQ=0;DQ=dat&0 x01;delay(5);DQ=1;dat=1;voidDisplay(unsignedinttemp)/顯示程序if(temp=4;temp*=10;dis0=temp/1000;/右移4位，相當(dāng)于乘0.0625，將溫度化為十進(jìn)制/擴(kuò)大10倍，顯示一位小數(shù)/千位dis1=temp%1000/100;/百位dis2=temp%1000%100/10;/十位dis3=temp%1000%100%10;/個(gè)位elsetemp=temp;

4、temp+=1;/負(fù)數(shù)/百位/十位/個(gè)位/先片選，在段選，反過(guò)來(lái)就不能正常顯示temp=4;dis0=0 x0c;dis1=temp%100/10;dis2=temp%100%10;dis3=0;P2=0 x01;P0=leddis0;delay(200);delay(200);P2=0 x02;P0=leddis1;delay(200);delay(200);P2=0 x04;P0=led1dis2;delay(200);delay(200);P2=0 x08;P0=leddis3;delay(200);delay(200);main()unsignedchartl=0,th=0;while

5、(1)Init();Write(0 xCC);/跳過(guò)讀序號(hào)列號(hào)的操作Write(0 x44);/啟動(dòng)溫度轉(zhuǎn)換delay(100);Init();Write(0 xCC);/跳過(guò)讀序號(hào)列號(hào)的操作Write(0 xBE);/讀取溫度寄存器等delay(100);tl=Read();/讀取溫度值低位th=Read();/讀取溫度值高位temp=th8;temp|=tl;Display(temp);U-4ktauterkp1MEN晞31s-8-3.3.PO.MACBFD.-RW+P0.6JWSppsgP2.富PZ示PZSD呂P2.釜一R2盍芯F2.5寶3P2.6M14P2蚩65ERE口sImlpsH-zds/iEffr3.S0pfn3&凰smRD1呂.FkI-LJLJ.|CO|jpp437|jpp|i|cs