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What signal should be sent to the RESET pin of the Adafruit FONA 3G+GPS Breakout in order to perform a Hard Reset of the module?

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What signal should be sent to the RESET pin of the Adafruit FONA 3G+GPS Breakout in order to perform a Hard Reset of the module?

(a) 100ms LOW Signal

(b) Continuous HIGH Signal

(c) 100ms HIGH Signal

(d) Continuous LOW Signal

I got this question during an interview.

My question is from Adafruit FONA 3G+GPS Breakout in division Interfacing of Sensors, Actuators, and Other Modules of Arduino

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Right choice is (a) 100ms LOW Signal

Explanation: The RESET Pin on the  Adafruit FONA 3G+GPS Breakout should only be used when some software issue has been created due to some configuration error. It completely hard resets the board erasing every manual configuration.

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