AVR单片机实验：基于DS18B20的多点温度测量，本实例中我们实现对并接在同一总线上的两个DS18B20的其中一个进行温度读取。-AVR microcontroller experiment: the DS18B20-based multi-point temperature measurement, this instance, one reads the temperature of the DS18B20 and then on the same bus.