ds18b20温度传感器

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1、最小的温度显示程序 -c51(2010-12-0700:45:27)转载标签：杂谈分类：51单片机#include#includesbitDQ=P2^0;bit presence;unsignedchartempl,temph;chararray[10]={0x7e,0x48,0x3d,0x6d,0x4b,0x67,0x73,0x4c,0x7f,0x4f};voidDelay(unsignedintnum)//可定义延时{ while(--num);}bitInit_DS18B

2、20(void){     DQ=1;     //DQ复位    Delay(8);   //稍做延时    DQ=0;     //单片机将DQ拉低    Delay(90);  //精确延时大于480us    DQ=1;      //拉高总线    Delay(8);    presence=DQ;   //如果=0则初始化成功=1则初始化失败    Delay(100);    DQ=1;       return(presence);//返回信号，0=presence,1=nopresence}u

3、nsignedintReadOneChar(void){unsignedchari=0;unsignedchardat=70;for(i=8;i>0;i--) {   DQ=0;//给脉冲信号   dat>>=1;//位右移   DQ=1;//给脉冲信号等待传感器返回脉冲   if(DQ)    dat

4、=0x80;   Delay(4); }   return(dat);}voidWriteOneChar(unsignedchardat){ unsignedchari=0; for(i=8;i>0;i--) 

5、{   DQ=0;   DQ=dat&0x01;   Delay(5);   DQ=1;   dat>>=1; }}voidRead_Temperature(void){    Init_DS18B20();    WriteOneChar(0xcc); //跳过读序号列号的操作    WriteOneChar(0x44); //启动温度转换    Init_DS18B20();    WriteOneChar(0xCC); //跳过读序号列号的操作    WriteOneChar(0xBE); //读取温度寄

6、存器    templ=ReadOneChar();  //温度低8位    temph=ReadOneChar();  7//温度高8位}voidmain(){floattemp;chara;   Init_DS18B20();   WriteOneChar(0xcc);   WriteOneChar(0x44);  //启动温度转换   Init_DS18B20();   WriteOneChar(0xcc);   WriteOneChar(0xbe);  //读取温度寄存器   templ=ReadOne

7、Char();  //温度低8位      temph=ReadOneChar();      //温度高8位   temph&=0x07;   temp=((templ>>4)

8、(temph<<4));   temp+=(templ&0x0f)*0.0625;   a=temp/10;   P1=array[a];   a=temp-10*a;   P0=array[a];}/*DS18b20温度传感器p3.4作为数据传输口晶振：11.0592M*/#includesbitDQ=7P3^4;

9、inttemperature;voiddelay(intus){ints;for(s=0;s>=1;DQ=1;if(DQ)u

10、=0x8000;delay(4);}return(u);}voidwrite(uns

11、ignedcharku){inti=0;for(i=0;i<8;i++){DQ=0;DQ7=ku&0x01;delay(3);DQ=1;ku>>=1;}}voidread0(void){//inttemperature;unsignedinttp;unsignedintlsb;rst();write(0xCC);write(0x44);rst();write(0xCC);write(0