DS18B20数字温度计是DALLAS公司生产的1－Wire，即单总线器件，具有线路简单，体积小的特点。因此用它来组成一个测温系统，具有线路简单，在一根通信线，可以挂很多这样的数字温度计，十分方便。

-DS18B20 digital thermometer is DALLAS company produces the 1-Wire, namely single bus, with lines, simple device small volume features. Therefore use it to form a temperature measurement system, with simple line, at a telecommunication lines, can hang many of these digital thermometer, very convenient