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What kind of input does the DC pin accept?

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What kind of input does the DC pin accept?

(a) Analog

(b) Digital

(c) PCM

(d) TDM

The question was posed to me by my school principal while I was bunking the class.

I need to ask this question from OLED Display Module in portion Interfacing of Sensors, Actuators, and Other Modules of Arduino

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The correct option is (b) Digital

To explain I would say: The DC pin of the Nokia 5110 Graphical DIsplay Module accepts only binary input wherein 0 means that sending 0 or a logical LOW signal will prime the module to accept system commands while sending a 1 or a logical HIGH signal will prime the module to accept actual display data.

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