DS18b20是热敏电阻吗

#include#include#defineuintunsignedint#defineucharunsignedcharsbitD=P3^5;sbitLED_EN_PORT=P2^5;sbitDAC_ADC_EN_PORT=P3^7;/*定义发光二极管及ADC、DAC、时钟的锁存器有效脚LE*/ucharcodetable[]={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90}; //段选ucharcodeable[]={0x7f,0xbf,0xdf,0xef,0xf7,0xfb,0xfd,0xfe};uinttemp;voiddelay(uintz);voidinit_ds18b20(void);ReadOneChar();WriteOneChar(uchardat);ReadTemperature(void);voiddelay(unsignedintz){ while(z--);}voidinit_ds18b20(void) //初始化{ unsignedcharx=0; D=1;//DQ复位 delay(8);//稍做延时 D=0;//单片机将DQ拉低 delay(80);//精确延时大于480us D=1;//拉高总线 delay(14); x=D;//稍做延时后如果x=0则初始化成功x=1则初始化失败 delay(20);}ReadOneChar(){ unsignedchari=0; unsignedchardat=0; for(i=8;i>0;i--){ D=0;//给脉冲信号 dat>>=1; D=1;//给脉冲信号 if(D)dat|=0x80; delay(4); } return(dat);}WriteOneChar(uchardat){ unsignedchari=0; for(i=8;i>0;i--){ D=0; D=dat&0x01; delay(5); D=1; dat>>=1; }}ReadTemperature(void){ unsignedchara=0; unsignedcharb=0; unsignedintt=0; floattt=0;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);//读取温度寄存器等（共可读9个寄存器）前两个就是温度 a=ReadOneChar(); b=ReadOneChar(); t=b; t<<=8; t=t|a; tt=t*0.0625;//将温度的高位与低位合并 t=tt*100.5;//对结果进行4舍5入 return(t);}/*1MS为单位的延时程序*/voiddelay_1ms(ucharx){ucharj;while(x--){for(j=0;j<125;j){;}}}voiddisplay(){ P2=0XDF; P0= table[temp/100]; delay_1ms(1);P2=0XBF;P0= table[(temp0/10)]&0x7f;delay_1ms(1); P2=0X7f;P0=table[temp]; delay_1ms(1);}voidmain(){ LED_EN_PORT=0;/*关闭发光二极管显示*/DAC_ADC_EN_PORT=0;/*关闭数码管以为的所有通道*/ while(1){temp=ReadTemperature();display(); } }数码管三位显示温度可以参考下呵呵希望对你有帮助