No logro hacer funcionar el Arduino MEGA con el shield : Shield SIM 900

La librería que estoy utilizando es la GSMSHIELD (Marcos).
En la librería descomenté las líneas que referían a utilizar el MEGA.

He buscado por todos lados y no logro encontrar un esquema que me funcione.
Si a alguien le pasó por favor que nos cuente como solucionar esto,
desde ya muchas gracias,
Saludos
Juan

I have a question on Arduino GSM is it possible to send and received voice and SMS from web (HTTP) not from Arduino

not from the on-board head-jack for headphones. Everything from web

if it possible please your advice​

12 V, 2A

What power supply are you using? What is the output current?

GSM Shield testing.
ATT: OK
RIC:
OK

DB:ELSE
ATT: OK
RIC:
OK

DB:ELSE
ATT: OK
RIC:
OK

DB:ELSE
ATT: OK
RIC:
OK

DB:CORRECT BR
ATT: OK
RIC:
OK

ATT: OK
RIC:
OK

ATT: OK
RIC: ATE0

OK

ATT: OK
RIC:
OK

ATT: OK
RIC:
OK

ATT: OK
RIC:
OK

ATT: OK
RIC:
OK

ATT: +CPMS:
RIC:
+CPMS: 2,30,2,30,2,30

OK

ATT: OK
RIC:
OK

ATT: SHUT OK
RIC:
SHUT OK

status=READY
ATT: OK
RIC:
OK

ATT: OK
RIC:
OK

ATT: OK
RIC:
+CREG: 0,1

OK

ATT: OK
RIC:
ERROR

ATT: OK
RIC:
ERROR

ATT: OK
RIC:
ERROR

ATT: OK
RIC:
ERROR

ATT: OK
RIC:
ERROR

status=ERROR
ATT: OK
RIC:
ERROR

ATT: Unknown
RIC:
ERROR

ATT: unknown
RIC:
ERROR

ATT: Not
RIC:
ERROR

ATT: 2D
RIC:
ERROR

ATT: 2d
RIC:
ERROR

ATT: 3D
RIC:
ERROR

ATT: 3d
RIC:
ERROR

ATT: OK
RIC:
ERROR

ATT: OK
RIC:
ERROR

The sketch is in the beginning of the copy, and the echo from Arduino is in the end of the following copy. Please help me to sort this out.

The Sketch:
___________________________________________________________
#include “SIM900.h”
#include
//#include “inetGSM.h”
//#include “sms.h”
//#include “call.h”
#include “gps.h”

//To change pins for Software Serial, use the two lines in GSM.cpp.

//GSM Shield for Arduino
//www.open-electronics.org
//this code is based on the example of Arduino Labs.

//Simple sketch to start a connection as client.

//InetGSM inet;
//CallGSM call;
//SMSGSM sms;
GPSGSM gps;

char lon[15];
char lat[15];
char alt[15];
char time[20];
char vel[15];
char msg1[5];
char msg2[5];

char stat;
char inSerial[20];
int i=0;
boolean started=false;

void setup()
{
//Serial connection.
Serial.begin(9600);
Serial.println(“GSM Shield testing.”);
//Start configuration of shield with baudrate.
//For http uses is raccomanded to use 4800 or slower.
if (gsm.begin(9600)) {
Serial.println(“nstatus=READY”);
gsm.forceON(); //To ensure that SIM908 is not only in charge mode
// gps.forceON();
started=true;
} else Serial.println(“nstatus=IDLE”);

if(started) {
//GPS attach
if (gps.attachGPS())
Serial.println(“status=GPSREADY”);
else Serial.println(“status=ERROR”);

delay(20000); //Time for fixing
stat=gps.getStat();
if(stat==1)
Serial.println(“NOT FIXED”);
else if(stat==0)
Serial.println(“GPS OFF”);
else if(stat==2)
Serial.println(“2D FIXED”);
else if(stat==3)
Serial.println(“3D FIXED”);
delay(5000);
//Get data from GPS
gps.getPar(lon,lat,alt,time,vel);
Serial.print(“Lon: “);
Serial.println(lon);
Serial.print(“Lat: “);
Serial.println(lat);
Serial.print(“Alt: “);
Serial.println(alt);
Serial.print(“Time: “);
Serial.println(time);
Serial.print(“Vel: “);
Serial.println(vel);
}
};

void loop()
{
//Read for new byte on serial hardware,
//and write them on NewSoftSerial.
serialhwread();
//Read for new byte on NewSoftSerial.
serialswread();
};

void serialhwread()
{
i=0;
if (Serial.available() > 0) {
while (Serial.available() > 0) {
inSerial[i]=(Serial.read());
delay(10);
i++;
}

inSerial[i]=”;
if(!strcmp(inSerial,”/END”)) {
Serial.println(“_”);
inSerial[0]=0x1a;
inSerial[1]=”;
gsm.SimpleWriteln(inSerial);
}
//Send a saved AT command using serial port.
if(!strcmp(inSerial,”TEST”)) {
Serial.println(“BATTERY TEST 1”);
gps.getBattInf(msg1,msg2);
Serial.println(msg1);
Serial.println(msg2);
Serial.println(“BATTERY TEST 2”);
gps.getBattTVol(msg1);
Serial.println(msg1);
stat=gps.getStat();
if(stat==1)
Serial.println(“NOT FIXED”);
else if(stat==0)
Serial.println(“GPS OFF”);
else if(stat==2)
Serial.println(“2D FIXED”);
else if(stat==3)
Serial.println(“3D FIXED”);
}
//Read last message saved.
if(!strcmp(inSerial,”MSG”)) {
Serial.println(msg1);
} else {
Serial.println(inSerial);
gsm.SimpleWriteln(inSerial);
}
inSerial[0]=”;
}
}

void serialswread()
{
gsm.SimpleRead();
}
_______________________________________________________________
From the Serial echo:
GSM Shield testing.
DB:NO RESP
DB:NO RESP
ATT: OK
RIC: AT

OK

DB:ELSE
ATT: OK
RIC: AT

OK

DB:CORRECT BR
ATT: OK
RIC: AT

OK

ATT: OK
RIC: AT&F

OK

ATT: OK
RIC: ATE0

OK

ATT: OK
RIC:
OK

ATT: OK
RIC:
OK

ATT: OK
RIC:
OK

ATT: OK
RIC:
OK

ATT: +CPMS:
RIC:
+CPMS: 9,20,9,20,9,20

OK

ATT: OK
RIC:
OK

ATT: SHUT OK
RIC:
SHUT OK

status=READY
ATT: OK
RIC:
OK

ATT: OK
RIC:
OK

ATT: OK
RIC:
+CREG: 0,1

OK

ATT: OK
RIC:
OK

status=GPSREADY
ATT: OK
RIC:
+CGPSSTATUS: Location Unknown

OK

ATT: Unknown
RIC:
+CGPSSTATUS: Location Unknown

OK

GPS OFF
ATT: OK
RIC:
0,0.000000,0.000000,0.000000,20150629111420.000,0,0,0.000000,0.000000
OK

ATT: OK
RIC:
0,0.000000,0.000000,0.000000,20150629111420.000,0,0,0.000000,0.000000
OK

Lon: 0.000000
Lat: 0.000000
Alt: 0.000000
Time: 20150629111420.000
Vel: 0.000000

I’ve changed the values ​​in the file Tx Rx GSM.cpp and nothing external power and is still not working.
Can you help with my problem?
Is there a library or some way to communicate the two shield?

http://www.open-electronics.org/how-to-send-and-receive-sms-with-gsmgprs-gps-shield/