用一片DS18B20构成测温系统，测量的温度精度达到0.1度，测量的温度的范围在－20度到＋100度之间，用8位数码管显示出来。-DS18B20 constituted by a temperature measurement system, measuring the temperature accuracy of 0.1 degrees, the temperature measurement range of-20 degrees to 100 degrees, and eight di