基于凌阳单片机SPE061A的超声波测距程序，具有短距离测距，中距离测距和可调距离测距等三种功能，运用凌阳大学计划所提供的开发板，可以很容易实现障碍物距离的检测-Based on Sunplus SPE061A Singlechip Ultrasonic Ranging procedure, with short-distance ranging, ranging in distance from the rangefinder and adjustable three functions, t