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怎么用超声波测距
https://singtown.com/product/50448/openmv-distance-shield/
有直接的测距扩展板。
我当时考虑过超声波， 但是分离收发的体积大，放不到扩展板上，如果是收发一体的，生产起来还麻烦，还贵。 超声波是靠时间脉宽长度测距的方式，太慢了，靠中断代码处理太麻烦。
直接用ToF测距，超级方便。