Which port on any Arduino board should be connected to the Key Port on the Adafruit FONA 3G+GPS Breakout?(a) Any Digital Pin(b) Vcc(c) Gnd(d) Any Analog PinThis question was posed to me during an interview.My question is from Adafruit FONA 3G+GPS Breakout topic in section Interfacing of Sensors, Actuators, and Other Modules of Arduino

Which port on any Arduino board should be connected to the Key Port on

1.	Which port on any Arduino board should be connected to the Key Port on the Adafruit FONA 3G+GPS Breakout?(a) Any Digital Pin(b) Vcc(c) Gnd(d) Any Analog PinThis question was posed to me during an interview.My question is from Adafruit FONA 3G+GPS Breakout topic in section Interfacing of Sensors, Actuators, and Other Modules of Arduino
Answer» The correct choice is (C) Gnd The explanation: TheAdafruit FONA 3G+GPS Breakout’s Key pin should be always connected to the Gnd Pin on any Arduino Board. This pin provides the function of the power on/off INDICATOR. When you would like to shutdown the board, CONNECT the pin to the Gnd of the Arduino Board for about 3 to 5 seconds. However for prolonged use usage of theAdafruit FONA 3G+GPS Breakout ONE needs to permanently connect this pin to the Gnd of the Arduino.

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