说明：  ds1820汇编程序 美国DALLAS公司生产的单线数字温度传感器DS1820,可把温度信号直接转换成串行数字信号供微机处理。由于每片DS1820含有唯一的硅串行数所以在一条总线上可挂接任意多个DS1820芯片。从DS1820读出的信息或写入DS1820的信息，仅需要一根口线（单线接口）。读写及温度变换功率来源于数据总线，总线本身也可以向所挂接的DS1820供电，而无需额外电源。DS1820提供九位温度读数，构成多点温度检测系统而无需任何外围硬件。
(ds1820 assembler DALLAS U.S. company produces single-line digital temperature sensor DS1820, the temperature signal can be directly converted into serial digital signals for computer processing. Because each DS1820 contains a unique silicon serial number  so a bus can be mounted any number of DS1820 chips. From the DS1820 to read out the information or write to DS1820 information, I only need one line (one-way interface). Read and write and temperature transform power from the data bus, the bus itself can also be articulated by the DS1820 to the power supply, and no additional power supply. DS1820 provides nine temperature readings constitute a multi-point temperature detection system without any external hardware.)