此乃一测温程序，DS18B20为美国DALLAS公司(已被MAXIM公司并购）生产的单线数字温度传感器，可将温度信号直接转换成数字信号供单片机处理，所测温度范围-55°C～125°C-This is a measurement procedure, DS18B20 U.S. DALLAS Corporation (M & A has been MAXIM) production of one-way digital temperature sensor, the temperature