Error while sending message using gsm sim900a module interfaced with arduino uno

Question

The code used for interfacing the gsm module with arduino for sending a message is as follows :-

#include <GSM.h>
#define PINNUMBER ""
// initialize the library instance
GSM gsmAccess; // include a 'true' parameter for debug enabled
GSM_SMS sms;
// char array of the telephone number to send SMS
// change the number 1-212-555-1212 to a number
// you have access to
char remoteNumber[20]= "12125551212"; 
// char array of the message
char txtMsg[200]="Test";
void setup()
{
 // initialize serial communications
 Serial.begin(9600);
 Serial.println("SMS Messages Sender");
 // connection state
 boolean notConnected = true;
 // Start GSM shield
 // If your SIM has PIN, pass it as a parameter of begin() in quotes
 while(notConnected)
 {
 if(gsmAccess.begin(PINNUMBER)==GSM_READY)
 notConnected = false;
 else
 {
 Serial.println("Not connected");
 delay(1000);
 }
 }
 Serial.println("GSM initialized");
 sendSMS();
}
void loop()
{
// nothing to see here
}
void sendSMS(){
 Serial.print("Message to mobile number: ");
 Serial.println(remoteNumber);
 // sms text
 Serial.println("SENDING");
 Serial.println();
 Serial.println("Message:");
 Serial.println(txtMsg);
 // send the message
 sms.beginSMS(remoteNumber);
 sms.print(txtMsg);
 sms.endSMS(); 
 Serial.println("\nCOMPLETE!\n"); 
}

the error is found on the 3rd line GSM_SMS sms; as GSM_SMS is not a name type. what point am i missing here...??

thank you in advance.

• Peter Bloomfield: Which version of the Arduino IDE are you using?

Answer 1

Update your IDE software. You need IDE 1.0.4 or later. I copied your code into my 1.0.5 IDE and compiled it without any error. So it is most probably your version of the Arduino IDE.