GBoard - Arduino GSM SIM900 Board


  • Model: IM120411004
  • Shipping Weight: 75 g
  • 3 Units in Stock
  • Manufactured by: IteadStudio


Arduino, GSM, XBee socket, nRF24L01+, SDCard socket built-in, GBoard will add wireless XBee, nRF24L01+, SDCard as well as GSM/GPRS connectivity to your projects. It's great for anything from home automation to robot control.

Gboard is a unique Arduino board which features a SIM900 GSM/GPRS module, an XBee socket, nRF24L01+ module interface and an ATMega328P controller. This board will add wireless XBee / nRF24L01+ control as well as GSM/GPRS connectivity to your projects. It's great for anything from home automation to robot control. The possibilities are endless!

Gboard can be used as a GSM/GPRS data transfer or wireless communication project development platform. Gboard support wide range power supply and Micro SD for mass storage. There are some 3pin electronic brick/ sensor brick interface breakout on board, it offer an easy way for a quick prototyping. The board requires FTDI basic board to upload sketch, you can use our Foca board to do it. Gboard can be powered by a mini USB, power Jack.


GBoard - Arduino with GSM / GPRS / Wireless development platform

UART Setting Jumpers

The SIM900 module and XBee module communicate to ATMega328 through UART. They cannot be used with the same port at the same time, so there are two UART setting jumpers to configure the UART communication. The figure of UART setting jumpers is as below.

D0 and D1 are hardware UART ports of Arduino. D2 and D3 are digital GPIO of Arduino. There are two configurations to set the UART communication.

Description UART Setting Jumpers Connection
Hardware UART to SIM900,Software UAR to Specific ST D0(Hardware Rx of Arduino),SR D1(Hardware Tx of Arduino),XT D2(Software Rx/Tx of Arduino),XR D3(Software Rx/Tx of Arduino)
Software UART to SIM900,Hardware UART to Specific XT D0(Hardware Rx of Arduino),XR D1(Hardware Tx of Arduino),ST D2(Software Rx/Tx of Arduino),SR D3(Software Rx/Tx of Arduino)

Power and reset connection of SIM900

In the GBoard, the PWRKEY and RESET pins of SIM900 module connect to Arduino as list below.

Arduino pin SIM900 pin Enable
D6 PWR High level Active
D7 RESET High level Active


With embedded bootloader, Gboard is easy to use by Arduino IDE through Foca series. ISP of Atmega328 is broke out for download firmware easily.

The GBoard does not have a USB connection. A USB to UART adapter is required to upload sketch - we recommend the Foca FT232RL breakout board.


Microcontroller ATMega328P
Max Frequency 16MHz
RAM Capacity 2K
FLASH Capacity 32K
External Resources
  • Onboard SD socket
  • Onboard GSM/GPRS
  • Electronic Brick Interface
Power Supply
  • External 12V
  • External 24V
  • External 7V
  • External 9V
I/O Operation Level 3.3V
Board Size 89mm x 61mm
Model IM120411004
Version 1.0
Weight 75.00g
Accessories Antenna





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