c - Necessidade resistor de pull-down - Stack Overflow em Português
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Pull-Down Resistor: What is it (And How Does it Work)? | Electrical4U
Pull up e Pull down no Arduino: Entenda como funciona - MakerHero
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Funny Electronics: What is Pull Down resistor ? How does Pull Down Resistor Works ?
Resistor pull-up – Wikipédia, a enciclopédia livre
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Resistor pull-up e pull-down - Mundo Projetado
