sparkfun MG2639 Cellular Shield, Hook-Up Manual

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• 12mm Coin Cell Battery – The shield includes a socket for a 12mm
coin cell battery – used by the on-board GPS module to retain
location memory and enable faster location fixes.
• Speaker and Microphone – If you want to turn the MG2639 Shield
into an actual cell phone these become pretty important.
Suggested Reading
Before delving into this guide, there are a few subjects you should be
familiar with. Here are some tutorials you may want to check out before
continuing on:
• Serial Communication – Both the cellular and GPS modules
communicate with your Arduino over a serial UART.
• Arduino Shields – Explore all things Arduino Shields. What they are
and how to assemble them.
• Installing an Arduino Library – We’ve written an Arduino library for
this shield, if you’ve never installed a library before, check this guide
out.
Hardware Overview
Before you get to connecting the MG2639 Cellular Shield to your Arduino,
you should familiarize yourself with the features and abilities of the board.
This page serves as an overview of the shield’s components and pin-outs.
It also looks at some of the “hidden” features of the board.
Component Overview
For a quick overview, here are most of the components of interest on the
shield:
Arduino Pins Used
One of the most important characteristics of a shield are the Arduino pins
used, here’s a list of the pins used by the cellular shield:
Arduino
Pin MG2639
Function Notes
VIN Power
Supply The MG2639 requires that the Arduino be
supplied with an external power source (USB
won't cut it). This pin is disconnectable via a
jumper.
A0 RING Alert This pin will go low when a phone call is
coming in.
2 Cell UART
TX Cell module's data output (4800 baud).
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