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What is the use of the EN3_4 pin?

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What is the use of the EN3_4 pin?

(a) Input

(b) Output

(c) Activation

(d) Power input

I have been asked this question during an internship interview.

This key question is from Motor Driver (L293D) and Motors in portion Interfacing of Sensors, Actuators, and Other Modules of Arduino

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The correct answer is (c) Activation

The explanation is: The EN3_4 pin is used to enable a part of the IC which controls a segment of the motors connected to it. They accept 5V usually if the module has a 5V rating.

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