超声波测距仿真图，程序运行正确！！ #INCLUDE #DEFINE UCHAR UNSIGNED CHAR #DEFINE ULONG UNSIGNED LONG #DEFINE UINT UNSIGNED INT SBIT OUT=P3^7; //发射 SBIT IN=P3^2; //接收 SBIT ON=P1^1; //启动 SBIT OFF=P1^0; //停止