这个文件虽然内容不复杂，但是有仿真和程序代码，利用的是常见的51单片机实现超声波探测，对超声波探测不熟悉的朋友，绝对是一个好东西-Although the contents of this document are not complicated, but there are simulation and program code, it is common to use 51 MCU ultrasonic detection, ultrasonic detection are not fami