Arduino MEGA 2560 and ICOMSAT SIM900 about gsm-shield-arduino

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I replied to you on issue15 at the same question.

Original comment by [email protected] on 2 Jul 2012 at 11:00

• Changed state: Invalid

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Same shit is happening to me. I am using GPRS shield with Arduino Uno. I have 
searched through every corner of the internet but couldn't make it work.

Original comment by [email protected] on 12 Nov 2012 at 1:01

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me too

Original comment by [email protected] on 30 Nov 2012 at 12:43

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Hi!

Try to use other pins for serial communication, since D2 has an other purpose. 
Arduino digital pin 2 and analon input pin A0 can be used to get the power 
status of the SIM900 module. There are 3 pins, along the ADC ports, there you 
can select one of these two ports. Put a jumper to connect the middle pin of 
the upper for A0 and to the lower to get power status on D2.

You can use D9 to power on the shield, if it's off, just take D9 to high for 
1200 ms.

I succeeded to use the shield on D0-D1 (hw-serial) and D4-D5 (sw-serial).

Good luck!

Original comment by [email protected] on 19 Jan 2013 at 5:12

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Hello there , 
I´m trying the same schema but unsuccessfully, anyone ?!

- sim900 (icomstat 1.1) w/ TX 4 e RX 5
- arduino Leonard
- library gsm
- extra power supply of 9v
but I have always the same answer below:

"Trying to force the baud-rate to 9600
ERROR: SIM900 doesn't answer. Check power and serial pins in GSM.cpp
status=IDLE"

The code is (: 

#include "SIM900.h"
#include <SoftwareSerial.h>
#include "sms.h"
SMSGSM sms;
boolean started=false;

void setup() 
{
  Serial.begin(9600);
  Serial.println("GSM Shield testing.");

  if (gsm.begin(2400)){
    Serial.println("\nstatus=READY");
    started=true;  
  }
  else Serial.println("\nstatus=IDLE");

  if(started){
    if (sms.SendSMS("Number", "SMS from Arduino"))
      Serial.println("\nSMS sent OK");
  }
};
void loop() 
{
}

Original comment by [email protected] on 7 Apr 2013 at 11:52

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Tambem não consigo fazer a biblioteca GSM funcionar no meu ARDUINO MEGA! se 
você tentar editar o arquivo .cpp da um monte de erros! como fazer funcionar 
com o arduino mega isso????


#include "SIM900.h"
#include "sms.h"
#include "SoftwareSerial.h"
#include "sms.h"
SMSGSM sms;

boolean started=false;
char smsbuffer[160];
char n[20];

int powerkey  =  5;
int statuspin =  6;
int pinState  =  0;

 int led1 = A0; 
 int led2 = A1;

void setup() 
{
  pinMode(powerkey, OUTPUT);
  pinMode(statuspin, INPUT);
  digitalWrite(powerkey, HIGH);  // set the LED on

  pinMode(led1, OUTPUT);
  digitalWrite(led1, 0);
  pinMode(led2, OUTPUT);
  digitalWrite(led2, 0);  


  //Serial connection.
  Serial.begin(9600);
  Serial.println("GSM Shield testing."); 


  //Start configuration of shield with baudrate.
  if (gsm.begin(2400)){
    Serial.println("SIM900D PRONTO");
    started=true;  
  }
  else Serial.println("SIM900D FALHA = IDLE");
  if(started){
    delsms();
  } 

   if(started){
    if (sms.SendSMS("99xxxxxx", "SISTEMA OK"))
      Serial.println("SMS ENVIADO PARA 99xxxxxx = SISTEMA OK");
  }

};

void loop() 
{
  pinState = digitalRead(statuspin);
  if(pinState==LOW)
  {
  digitalWrite(powerkey, HIGH);  // set the LED on
  delay(1000);
  digitalWrite(powerkey, LOW);
  }


  int pos=0;
  //Serial.println("Loop");

  if(started){
    pos=sms.IsSMSPresent(SMS_ALL);

    if(pos){
      Serial.println("IsSMSPresent at pos ");
      Serial.println(pos); 
      sms.GetSMS(pos,n,smsbuffer,100);
      Serial.println(n);
      Serial.println(smsbuffer);
//----------------------------------------------------------------------------- 

        if(!strcmp(smsbuffer,"a")){
          Serial.println("LED VERDE ON");
          digitalWrite(led1, HIGH);        

          if (digitalRead(led1 == HIGH)){            
            sms.SendSMS("99xxxxxx", "LED VERDE IS ON");
            Serial.println("\nSMS sent OK");
         }
        }         

//------------------------------------------------------------------------------
---            
        if(!strcmp(smsbuffer,"b")){
          Serial.println("LED VERDE OFF");
          digitalWrite(led1,LOW);

          if (digitalRead(led2 == LOW)){            
             sms.SendSMS("99xxxxxx", "LED VERDE IS OFF");
             Serial.println("\nSMS sent OK");
          }
      }
//------------------------------------------------------------------------------
---    
        if(!strcmp(smsbuffer,"oi arduino")){
          Serial.println("Andre falando oi");
          //digitalWrite(led1,LOW);

          //if (digitalRead(led2 == LOW)){            
             sms.SendSMS("99xxxxxx", "Daee, susse Sr Mion??");
             Serial.println("\nSMS sent OK");
          //}
      }
//------------------------------------------------------------------------------
---    
        if(!strcmp(smsbuffer,"vs")){
          Serial.println("Verificando saldo...");         

             sms.SendSMS("*222#", "");
             Serial.println("\nSMS sent OK");

      }
//------------------------------------------------------------------------------
---    
      delsms();

    }    

  }
};

void delsms(){
  Serial.println("Deletando SMS's Antigos...");

  for (int i=0; i<10; i++){  //do it max 10 times
      int pos=sms.IsSMSPresent(SMS_ALL);
      if (pos!=0){

        Serial.print("\nNovo SMS na posicao ");
        Serial.println(pos); 

        if (sms.DeleteSMS(pos)==1){    
          Serial.print("\nDeletando SMS da posicao ");
          Serial.println(pos);      
        }

      }
    }

}

Original comment by [email protected] on 3 Jul 2013 at 4:55

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This issue section is not longer supported.
Please check the support page www.gsmlib.org 

Original comment by [email protected] on 6 Jul 2013 at 11:27

• Changed state: Fixed

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Hello everybody icomast gsm shield v1.1 is working on adruino uno by setting 
jumpers 2 and 3 but not on arduino mega,

Original comment by [email protected] on 18 Nov 2014 at 4:55