程序功能: 用温度传感器DS18B20读取外界温度,然后用单片机读取传感器里面的两个装 有温度值的寄存器温度.最后用单片机处理,将数值显示在数码管上. -Program features: DS18B20 used to read the outside temperature sensor temperature, and then use the single-chip sensor reads the temperature inside the two with the temp