用DS18B20测量室温并在数码管上显示。 用中断方式读取四个独立式按键的键值，同时用D1~D4四个LED的点亮来指示k1~K4四个按键的按下-DS18B20 measured at room temperature and used in the digital tube display. With interruption of the way to read the four stand-alone keypad keys, D1 ~ D4 simultaneously with fo