超声波测距程序 完整工程 能实现距离测量 单位为米 传感器为 hy—srf05 单片机为s12xs128 开发环境为 cw5.1-Ultrasonic ranging program complete works to achieve distance measurement units in meters sensor for of hy-srf05 microcontrollers for s12xs128 development environment cw5.1