通过STM32来读取外部数字温度传感器的温度，来得到较为准确的环境温度，用单总线技术，通过它来实现STM32和外部温度传感器（DS18B20）的通信，并把从温度传感器得到的温度显示在TFTLCD模块上(To read through the external digital temperature sensor STM32 temperature, to get more accurate temperature by single bus technology, through which t