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I have a problem with my TowerPro servo. When I connect it to my Arduino board it starts to rotate from ~10° to ~170° itself. It doesn't respond to any button interrupt.

When I plug in another servo (MG90S) in the same spot it works perfectly fine. Power source for servo and microcontroller is separated. Ground is the same for all devices.

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Are you providing enough current to the servo? I've have strange behaviour before, when I wasn't supplying enough juice. – Greenonline Jan 3 at 16:46

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