GSM Module SIM900A

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: 50 x 50 mm