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The Arduino GSM Shield connects your Arduino to the internet using the GPRS wireless network. Just plug this module onto your Arduino board, plug in a SIM card from an operator offering GPRS coverage and follow a few simple instructions to start controlling your world through the internet. You can also make/receive voice calls (you will need an external speaker and microphone circuit) and send/receive SMS messages.
Arduino Uno on pins 2, 3 (Software Serial) and 7 (reset)The shield uses digital pins 2 and 3 for software serial communication with the M10 and pin 7 (reset) on the Arduino UNO. See these notes for working with an Arduino Mega, Mega ADK, or Leonardo.
The M10 radio modem is a Quad-band GSM/GPRS modem that works at the following frequencies: GSM850MHz, GSM900MHz, DCS1800MHz and PCS1900MHz. It supports TCP/UDP and HTTP protocols through a GPRS connection. GPRS maximum data downlink and uplink transfer speed is 85.6 kbps.
To interface with the cellular network, the board requires a SIM card provided by a network operator.
The most recent revision of the board uses the 1.0 pinout on rev 3 of the Arduino Uno board.
The micro to nano SIM adapter is included in the box.
It is recommended to power the board with an external power supply that can provide between 700mA and 1000mA. Powering an Arduino and the GSM shield from a USB connection is not recommended, as USB cannot provide the required current when the modem is in heavy use.
The modem can pull up to 2A of current at peak usage, which can occur during data transmission. This current is provided through the large orange capacitor on the board's surface.
The shield contains a number of status LEDs:
- On: shows that the Shield is getting power.
- Status: switches on when the modem is powered and data is being transferred to/from the GSM/GPRS network.
- Net: blinks when the modem is communicating with the radio network.
The shield comes with a on-board audio jack as well, and it can be used for both microphone and line inputs. It is also possible to make voice calls. You don’t need to add a speaker and microphone.
There are two small buttons on the shield. The button labeled "Reset" is tied to the Arduino reset pin. When pressed, it will restart the sketch. The button labeled "Power" is connected to the modem and will power the modem on and off.