The GPRS/GSM Shield provides you a way to use the GSM cell phone network to receive data from a remote location. The shield allows you to achieve this via any of the three methods:

• Short Message Service
• Audio
• GPRS Service

The GPRS Shield is compatible with all boards which have the same form factor (and pinout) as a standard Arduino Board. The GPRS Shield is configured and controlled via its UART using simple AT commands. Based on the SIM900 module from SIMCOM, the GPRS Shield is like a cell phone. Besides the communications features, the GPRS Shield has 12 GPIOs, 2 PWMs and an ADC.

Note:

• Because SIM900 peak current more than 2A. This shield must work with a external DC9V power supply.
• If you are using MEGA2560. Just need to connect the middle pins of RX and TX jumpers to RX1 TX1 on Arduino Mega 2560. And change the code setting.

Features

• Based on SIMCom's SIM900 Module
• Quad-Band 850 / 900/ 1800 / 1900 MHz - would work on GSM networks in all countries across the world.
• Control via AT commands - Standard Commands: GSM 07.07 & 07.05 | Enhanced Commands: SIMCOM AT Commands.
• Short Message Service - so that you can send small amounts of data over the network (ASCII or raw hexadecimal).
• Embedded TCP/UDP stack - allows you to upload data to a web server.
• Speaker and Headphone jacks - so that you can send DTMF signals or play recording like an answering machine.
• SIM Card holder and GSM Antenna - present onboard.
• 12 GPIOs, 2 PWMs and an ADC (all 2.8 volt logic) - to augment your Arduino.
• Low power consumption - 1.5mA(sleep mode)
• Industrial Temperature Range - -40°C to +85 °C

Document:

• Schematic
• Datasheet
• Test code
• AT Command Manual