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Voltage level should be used for questions that are referring to using hardware together that operates on different voltages (the "concentration" of electricity).

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Output 3.3V when setting pin to high

I would like to pass 3.3V and Ground to an component. How can I achieve such a thing? I for example would like to let a wire get 3.3V when I for example do digitalWrite(pin, HIGH). It is hard for me …
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