说明：  本实验采用DS18B20（数字测温芯片）作为温度传感器，结果在1602 LCD上显示。下载试验程序后，在LCD上当前室温以及单位℃。
(Used in this experiment DS18B20 (digital temperature measurement chip) as a temperature sensor, the results shown in the 1602 LCD. Download the test procedure, in the current room temperature as well as the LCD units ℃.)