Quick Overview
Raspberry PI GSM Add-on is customized for Raspberry Pi interface based on SIM900 quad-band GSM/GPRS module.
Details
Raspberry PI GSM Add-on is customized for Raspberry Pi interface based on SIM900 quad-band GSM/GPRS module. AT commands can be sent via the serial port on Raspberry Pi, thus functions such as dialing and answering calls, sending and receiving messages and surfing on line can be realized. Moreover, the module supports powering-on and resetting via software.
Features
Quad-Band 850/ 900/ 1800/ 1900 MHz
GPRS multi-slot class 10/8GPRS mobile station class B
Compliant to GSM phase 2/2+Class 4 (2 W @850/ 900 MHz)
Class 1 (1 W @ 1800/1900MHz)
Control via AT commands (GSM 07.07 ,07.05 and SIMCOM enhanced AT Commands)
Low power consumption: 1.5mA(sleep mode)
Operation temperature: -40°C to +85 °C
Specifications
PCB size 73.8mm X 70mm X 1.6mm
Input voltage 5V
Interface UART
Baud rate 9600 (default)
Electrical characteristics
Parameter Min. Typical Max. Unit
Supply voltage - 5 5.5 VDC
Current consumption (average) - 500 - mA
Instantaneous current consumption - - 2 A
Pinmap
Raspberry PI interfaces
Raspberry Pi Pin N.O. Pin name Pin of SIM900 ModuleDescription
11 GPIO0 SIM900-PWERKEY Powering-on key via software
12 GPIO1 SIM900-RST Resetting key via software
13 GPIO2 -
15 GPIO3 -
16 GPIO4 -
18 GPIO5 -
22 GPIO6 -
7 GPIO7 -
3 SDA0 -
5 SCL0 -
24 CE0 -
26 CE1 -
19 MOSI -
21 MISO -
23 SCLK -
8 TXD SIM900_RX Receiving end for SIM900 serial port
10 RXD SIM900_TX Sending end for SIM900 serial port
2 +5V -
1 +3.3V -
6 GND -
Other interfaces
Pin name Description
DR Receiving end for SIM900 debugging serial port
DT Sending end for SIM900 debugging serial port
VBAT SIM900 supply 4.2V
G Ground
V Electronic brick interface supply pin 3.3V
Indicators
PWR
Power: When there is normal supply to the board, the indicator keeps on.
STATUS
SIM900 status: When SIM900 works normally, the indicator keeps on.
NET
SIM900 network status: used to indicate network status, the working status of the indicator is as below:
Network indicator status SIM900 working status
OFF SIM900 does not work
64ms on/800ms off SIM900 does not find network
64ms on/3000ms off SIM900 registers the network
64ms on/300ms off GPRS communicates
Keys
SIM900-PWRKEY
SIM900 powering-on key: Keep pressing the key for more than 1 second, SIM900 will be powered on; keep pressing the key for more than 1 second after the board is powered on, SIM900 will be powered off.
SIM900-RST
SIM900 resetting key: press the key, SIM900 will be reset.
Note
The module does not support hot swapping.
Packing List
Raspberry PI GSM Add-on x 1
Antenna x 1