SIM900A GSM/GPRS Module (Raspberry Pi & Arduino Compatible)

This SIM900 GSM / GPRS Module is useful for using a cell phone network to talk to your microcontrollers wirelessly. Just wire it up to your microcontroller and you'll have quad-band GSM network access anywhere in the world! Pop in a GSM simcard to send/receive calls and messages from your projects like you would with a cell phone. There are three protocols you can use to send messages: Short Message Service, Audio, or GPRS Service.

Specifications:

• Supports standard size GSM sim cards
• Chipset: SIM900A
• Quad-Band 850 / 900/ 1800 / 1900 MHz (works on GSM networks in any country)
• The module is configured and controlled using simple AT commands via the onboard UART:
• Standard Commands: GSM 07.07 & 07.05
• Enhanced Commands: SIMCOM AT Commands
• Has 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.
• Physical Features:
• External GSM Antenna with SMA connector
• SIM Card holder (Flip Style)
• Call Indicator LED
• Onboard Serial RS232 interface foreasy debugging (3 pins on the left, see diagram for how to wire to an RS232 connector)
• Onboard reset and restart solder points
• Additional antenna can be added with IPX mini connector
• Yellow Logic Level Select Pins: select between 5V and 3.3V interface (yellow pins)
• Power Wires (red and black)

• SIM900A Serial Port Output Terminal    
• Power Voltage (to be attached across the red and black wires): 5V DC (1A or higher is recommended)
• Arduino & Raspberry Pi Compatible
• Built in surge protection & SMF05C chip onboard for electrostatic protection
• Dimensions: 2" x 2"