Comparison of GSM overlays
| Specification |
A-GSM Shield |
Ardiuno GSM Shield |
SparkFun SM5100B Shield |
|---|---|---|---|
| GSM chipset | Quectel M85 | Quectel M10 | SM5100B |
| GSM standard |
850 900 1800 1900 MHz |
850 900 1800 1900 MHz |
850 900 1800 1900 MHz |
| Built-in antenna | YES | YES | NO |
| Output of the external antenna | YES | YES | through the SM5100B module |
| Dual SIM | Yeah. (single standby) | NO | NO |
| Built-in USB interface | YES (UART - USB) | NO | NO |
| Support for 3.3V and 5V | YES | YES | ?? |
| Connections to Arduino | YES | YES | YES |
| UART RxD interface, TxD | YES | YES | YES |
| Reset modem - interface | YES | NO | NO |
| ON/OFF modem - interface | YES | YES | NO |
| Reset Arduino - interface |
YES | YES | NO |
| Reset modem - button |
YES | NO | NO |
| ON/OFF modem - button |
YES | YES | NO |
| Reset Arduino - button |
YES | YES | YES |
| Additional interfaces | YES | YES | NO |
| MicroSD connector | YES | NO | NO |
| Audio jack output |
YES (2 x 3.5 mm stereo) |
NO | NO |
| Audio power | 700 mW RBM | ~ 100 mW RMS | ?? |
| Switching power source | YES | YES | NO |
| VIN supply voltage | 5 - 38 V (3 jumper selectable power supply modes) | 5 - 20 V | 5 - 20 V (SPX29302) |
| External power port | Yeah. (microUSB) | NO | NO |
| Example code for Arduino |
YES (with DTMF) |
YES | NO |
| Example code for RaspberryPi |
YES (with DTMF) |
NO | NO |
| Dimensions | 84 x 53,34 mm | 101.5 x 53.50 mm | 76 x 55 mm |
| Place of manufacture | EU (Romania) | EU (Italy) | China / USA |
| Design / Manufacturer | R&D Software Solutions | Arduino | SparkFun |