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Which interface does SD.h depend on for communication between the SD Card Module and the Arduino?

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Which interface does SD.h depend on for communication between the SD Card Module and the Arduino?

(a) SPI

(b) I2C

(c) USB

(d) TTL

I have been asked this question in semester exam.

This interesting question is from Standard Libraries topic in section Arduino Programming of Arduino

1 Answer

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The correct answer is (a) SPI

Explanation: The SD.h library for communication between SD Card Modules and Arduinos use SPI (Serial Peripheral Interface) for establishing communications. The SPI is a synchronous Serial Communication Protocol which is used for short distance communications between microcontrollers and devices like SD Card Readers, shift resistors, etc.

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