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OpenMV4 H7可以用3个舵机，OpenMV3 M7和 OpenMV4 H7 Plus都只能用2个舵机。
那买了拓展板可以用么？
OpenMV 舵机扩展板可以额外控制8个舵机。
教程： https://singtown.com/learn/50057/
