GSM Modem with Arduino UNO

How to send an SMS using GSM Modem connected to Arduino UNO

Components Required:

1. Arduino UNO

2. GSM/GPRS Modem (In this I have used SIM900 Module)

3. PC/Laptop

4. Connecting wires and USB cable for connecting Arduino to PC.

Connection Diagram:
For Code Without using Library files:

For Code With Using Library files:

Because the library files for GSM Shield are defined with software serial with Rx as Pin2 and Tx as Pin3 by default, which we can change if we require in the GSM.cpp file inside the library folder.

Code:
Without using Library files:

void setup()
{
  Serial.begin(2400);  //Baud rate of the GSM/GPRS Module 
  Serial.print("\r");
  delay(1000);                  
  Serial.print("AT+CMGF=1\r");    
  delay(1000);
  Serial.print("AT+CMGS=\"+91944xxxxxx8\"\r");    //Number to which you want to send the sms
  delay(1000);
  Serial.print("Test SMS -Jay\r");   //The text of the message to be sent
  delay(1000);
  Serial.write(0x1A);
  delay(1000); 
}
void loop()
{
}


With using GSM Library file:

#include "SIM900.h"

#include <SoftwareSerial.h>

#include "sms.h"

SMSGSM sms;

void setup()

{

  Serial.begin(9600);

  Serial.println("GSM Testing to send SMS");

  if (gsm.begin(2400)){

    Serial.println("\nstatus=READY");

    started=true; 

  }

  else Serial.println("\nstatus=IDLE");

 

  if(started){

    if (sms.SendSMS("+919********8", "Arduino SMS"))// number to which you want to send the sms and the sms text//

    Serial.println("\nSMS sent OK");

  }

};

void loop()

{

};

Note: 
The GSM Library can be downloaded from the link below:
https://code.google.com/p/gsm-shield-arduino/downloads/list

Video Demo of the Project:

Credits:
Marco Martines and Boris Landoni for the GSM/GPRS Library for SIM900 GSM Module