Schematics of GPRS/GSM Arduino Shield:
This is an Arduino Shield for SM5100 quad-band GSM/GPRS module. The module is included.
Two jumpers can be used to select if the SM5100 module is talking to soft serial port, serial port of arduino, or USB.
J1 and J2 are used to choose how RX/TX of SM5100B is going to connected to Arduino.
RX/TX is the RX/TX of SM5100B module.
MTX/MRX is the TX/RX of Atmega328.
D3 and D2 are the I/O of Atmega328 if soft serial is used.
Connect RX to MRX, and remove atmega328, so USB port of arduino can be used to directly to talk to SM5100B.
Connect RX to MTX, and keep atmega328, so SM5100B can talk to the MCU.
USA providers are all on 850/1900Mhz and pratically all the rest of the world uses 900/1800Mhz.
Solid SM5100B GSM/GPRS module: a miniature, single-side board, quad-band GSM 850/EGSM 900/DCS 1800/PCS 1900 module, ready for integration in various kinds of Fix wireless phones and other wireless devices.
Normal range: -10°C to +55°C (full compliant)
Storage: -40°C to +85°C
35.0X39.0X2.9 mm (typical)
VBAT: 3.3V to 4.2V range, 3.6V typical.
Off mode: <100uA
Sleep mode: <2.0mA
Idle mode: <7.0mA (average)
Communication mode: 350 mA (average,GSM)
Communication mode: 2000mA (Typical peak during TX slot,GSM)
Li-ion Battery charging management and interface (OPTION)
Li-ion Battery charging management is included. The charger interface is provided on 60-pin connector. (only for 3.7V Li-ion Battery)
EGSM900 +GSM850+ DCS1800+PCS1900
Class 4 (2W) for EGSM900/GSM850
Class 1 (1W) for DCS1800/PCS1900
Supported SIM card
3V/1.8V SIM card. (auto recognise)
4x6 keyboard interface is provided
UART0 interface with flow control
Up to 460 kbps
Full hardware flow control signals (+3.0V) are provided on 60 pins.
UART1 interface without flow control
2-Wire UART interface
Up to 460 kbps
Support standard SPI interface