单片机ds18b20温度测量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;/分别为0-9,不显示，负号Unsignedcharled110=0 x40,0 x79,0 x24,0 x30,0 x19,0 x12,0 x02,0 x78,0 x00,0 x10;/带小数点显示voiddelay(unsignedinti)/如果i是unsigendchar类型，则会

2、出现错误结果while(i-);voidInit(void)/初始化/unsignedcharflag=0;DQ=0;/单片机将DQ拉低delay(100);/精确延时大于480us小于960usDQ=1;/拉高总线delay(30);flag=DQ;稍做延时后如果flag=0则初始化成功flag=1则初始化失败/delay(20);unsignedcharRead(void)/读字节unsignedchari=0;unsignedchardat=0;for(i=8;i0;i-)DQ=0;/给脉冲信号dat=1;DQ=1;/给脉冲信号if(DQ)dat|=0 x80;delay(5);retu

3、rn(dat);voidWrite(unsignedchardat)/写字节unsignedchari=0;for(i=8;i0;i-)DQ=0;DQ=dat&0 x01;delay(5);DQ=1;dat=1;voidDisplay(unsignedinttemp)/显示程序if(temp=4;temp*=10;dis0=temp/1000;/右移4位，相当于乘0.0625，将温度化为十进制/扩大10倍，显示一位小数/千位dis1=temp%1000/100;/百位dis2=temp%1000%100/10;/十位dis3=temp%1000%100%10;/个位elsetemp=temp;

4、temp+=1;/负数/百位/十位/个位/先片选，在段选，反过来就不能正常显示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);/跳过读序号列号的操作Write(0 x44);/启动温度转换delay(100);Init();Write(0 xCC);/跳过读序号列号的操作Write(0 xBE);/读取温度寄存器等delay(100);tl=Read();/读取温度值低位th=Read();/读取温度值高位temp=th8;temp|=tl;Display(temp);U-4ktauterkp1MEN晞31s-8-3.3.PO.MACBFD.-RW+P0.6JWSppsgP2.富PZ示PZSD吕P2.釜一R2盍芯F2.5宝3P2.6M14P2蚩65ERE口sImlpsH-zds/iEffr3.S0pfn3&凰smRD1吕.FkI-LJLJ.|CO|jpp437|jpp|i|cs