This GSM / GPRS Shield is based on the SIM900 module from SIMCOM and comes with all the necessary connectors and components to make full use of the cellular module. It provides you with a way to communicate wirelessly via the same network infrastructure that cellphones use. With this shield you will be able to add SMS, MMS, voice, and GPRS capabilities to most standard Uno R3 boards. The SIM900 module is typically controlled via UART with the help of a particular set of AT commands (GSM 07.07, 07.05 and SIMCOM enhanced AT Commands). In addition, 12 GPIOs, 2 PWMs and an ADC input from the SIM900 have been broken out to pin headers on the shield making them easy to access.
Features / Specs
- GSM Module: SIMCom SIM900 (Refurbished Module)
- Firmware Version: 1137B10SIM900M64_ST
- DC Jack Input Voltage: 5 – 26VDC (Power source should be rated at 2A or higher)
- DC Jack Size Category: 2.1mm x 5.5mm
- DC Jack Compatibility: Mates with any opposite gender DC jack in the same size category
- Supported GSM Frequencies: 850/900/1800/1900MHz (Quad Band)
- Transmitting Power: Class 4 (2W) at GSM 850 and EGSM 900 / Class 1 (1W) at DCS 1800 and PCS 1900
- GPRS Connectivity: GPRS multi-slot class 10 (Default) / GPRS multi-slot class 8 (Optional)
- GPRS Data Transfer Speed (Max): Downlink (85.6kbps) / Uplink (42.8kbps)
- Compatible AT Command Sets: 3GPP TS 27.007,27.005 and SIMCOM Enhanced AT Commands
- Comms Interface: UART (1200bps to 115200bps)
- Firmware Upgrade: Supported via UART interface
- SIM Card Slot: Standard SIM (Micro and Nano SIM cards will require an adapter)
- Operating Current (Typical in Sleep Mode): 1.0mA
- Operating Temperature (Approx): -30℃ to +80℃
- Dimensions: ~(85mm x 57mm x 20mm)
Note on Refurbished Modules:As you may have noticed, the SIMCom modules used on these breakout boards are classified as refurbished. What this ultimately means is that the modules have been de-soldered from another device that may or may not have been in operation, and re-soldered onto the brand new breakout boards with the rest of the components being brand new as well. The modules are still fully operational and original SIMCom modules, but may have some marks and scratches on their labels (This happens during de-soldering). Any similar SIMCom module sold at this price point will almost always be using a refurbished module. Some manufacturers have even gone to the lengths of reprinting the module label so that they seem new, but if you look closely you should be able to see the original label underneath. We would like to be completely transparent regarding all the items we sell which is why we think it is important that we explain the above in such detail.
Shield Compatibility
Note: Header pins will need to be soldered into the board to attach it directly to one of the Arduino’s listed below
- Arduino Uno R3 Clone – CH340: SIM card holder does not clear the USB connector, so does not push all the way in on one corner. Can still be used.
- Arduino Uno R3 Clone: SIM card holder does not clear the USB connector, so does not push all the way in on one corner. Can still be used.
- Arduino Leonardo R3 Clone: SIM card holder does not clear the DC Jack connector, so does not push all the way in on one corner. Can still be used.