动态数码管显示基于51单片机，简单而且高效。初学者可参考(Dynamic digital tube display based on 51 single chip microcomputer)

用于C语言硬件编程，HC-SR04超声波_原理图，对于编程实现其功能提供支持。(It is used for C language hardware programming, hc-sr04 ultrasonic-schematic diagram, and provides support for programming and realizing its functions.)