超声波热表极易受到外界干扰，主要原因是分辨率较低，本文提出三种方法提高精度。-Ultrasonic heat meter vulnerable to outside interference, mainly due to lower resolution, this paper proposes three methods to improve accuracy.

基于RT-thread嵌入式操作系统的框架，以GP21为核心的热量表系统开发代码，包括热量传感器计算、应用程序调度、EPD显示程序和存储程序共5部分-Based on the RT-thread embedded operating system framework, GP21 as the core of the heat meter system development code, including heat sensor calculation, application scheduli