FONA pinouts

[last updated: 2018-07-30]
go to: FONA HOME
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This info mostly extracted from Adafruit tutorial:
(link to:) Adafruit tutorial

• On FONA-1 shield, when board is powered up, blue LED on FONA blinks 'fast', about 0.8 sec/blink. Once connected to cell network, it slows to about 1.2 sec/blink.
• On FONA-2 breakout, blue LED on constant when FONA is powered up.
  red LED blinks slow, then fast, maybe after cell signal is acquired?
• Both the Mega (w/ 7-12v or USB-B) and the FONA (w/ 3.7v LiPo battery) must be powered
• The FONA Vio pin must be connected to a voltage reference, to define the voltage levels of its Tx & Rx signals. Use either 5v or 3v as needed by the MCU that you're using.

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