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What is the full form of the RI pin on the Adafruit FONA 3G+GPS Breakout?

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What is the full form of the RI pin on the Adafruit FONA 3G+GPS Breakout?

(a) Ring Indicator

(b) Right Indicator

(c) Right Impersonation

(d) Rig Indicator

This question was posed to me by my college director while I was bunking the class.

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

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Best answer
Right choice is (a) Ring Indicator

Best explanation: The Adafruit FONA 3G+GPS Breakout has an RI pin which acts as a interrupt out pin for it. When a call is received on the module this pin becomes LOW, and is HIGH by default. Furthermore, it can also be used as an indicator for SMS.

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