domanda tecnica su spegnere un PIN

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mi serve solo una domanda tecnica quando io uso   digitalwrite(13, low)  per spegnere un led il pin 13 fisicamente viene messo massa??
mi interesserebbe sapere come spegnere una porta, in modo che il led è massa(gnd) e niente.
praticamente la porta non deve ne essere high ne  low
si può fare?

ne high ne low quindi tri-state. definisci il pin come input.

ciao
qp


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