Quad-band GPRS/GSM Shield for Arduino

Introduction

Model:Arduino_SM5100_1

Usage

This tutorial covers the GPRS/GSM SM5100B Shield: http://www.cutedigi.com/arduino-shields/quad-band-gprsgsm-shield-for-arduino-cellular-module-included.html

The shield must be powered by a wall adapter with 12V, 1A.

Hardware Jumpers Explain:

• 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.

First Tutorial

• RX jump to MRX, TX jump to MTX, and remove the atmega328P from arduino.

By doing this, we can directly monitor serial port output using the USB port. The default baud rate of SM5100B is 115200.

• Install X-CTU serial terminal console X-CTU.
• Change communication band to 7 if you are in North America. Refer to change communication band

If you see +SIND: 8, it means that it's not registered on the network:

 It could be:
   SIM card issue, card is not active, or the contact to the SIM socket is not good
   antenna cable connection issue

Second Tutorial

Now we are going to use atmega328P's UART to talk to USB, and soft serial of atmega328P to talk to Sm5100B.

Before we do that, we have to change SMB5100's data rate to 9600 as soft serial can't go to 119200. In first tutorial setup, do: AT+IPR=9600 to set the baud rate to 9600.

Now set the jumper RX to D3, and TX to D2. SO that atmega328P's UART to talk to USB and soft serial of atmega328P to talk to SM5100B:

<syntaxhighlight lang="c">

/* SparkFun Cellular Shield - Pass-Through Sample Sketch SparkFun Electronics Written by Ryan Owens CC by v3.0 3/8/10 Thanks to Ryan Owens and Sparkfun for sketch */

1. include <NewSoftSerial.h> //Include the NewSoftSerial library to send serial commands to the cellular module.
2. include <string.h> //Used for string manipulations

char incoming_char=0; //Will hold the incoming character from the Serial Port. NewSoftSerial cell(2,3); //Create a 'fake' serial port. Pin 2 is the Rx pin, pin 3 is the Tx pin. void setup() {

 //Initialize serial ports for communication.

Serial.begin(9600); cell.begin(9600); Serial.println("Starting SM5100B Communication..."); } void loop() { //If a character comes in from the cellular module... if(cell.available() >0) { incoming_char=cell.read(); //Get the character from the cellular serial port. Serial.print(incoming_char); //Print the incoming character to the terminal. } //If a character is coming from the terminal to the Arduino... if(Serial.available() >0) { incoming_char=Serial.read(); //Get the character coming from the terminal cell.print(incoming_char); //Send the character to the cellular module. } }

</syntaxhighlight>

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See Also

Other related products and resources.

Licensing

This documentation is licensed under the Creative Commons Attribution-ShareAlike License 3.0 Source code and libraries are licensed under GPL/LGPL, see source code files for details.