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Is OTG a requirement? Or just good to have?

I have a bunch of C3-mini boards and it would be great to finally use them for something more interesting than a temperature sensor.

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Not really a requirement, you won't see USB section on the GUI. The capibaraZero is designed to support almost every device that support Arduino Wiring framework, so if a device doesn't support a feature, it will be hidden in GUI

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