Arduino Mega GSM Antenova and GPS Skylab SKM53

Hello guys.I had a problem with my arduino mega,gps skm53 and a gsm shield telefonica. I couldnt get the coordinates when im combining all of those components together. If i test the mega and the gps, it works perfectly and gives the correct coordinate but if i combine it with the gsm, the gps lattitude and longitude will said 0. Can you guys help me?

Can you guys help me?

The problem is on line . . . 78.

What do you mean by the problem is on line 78?

Or maybe it is line 156.

What do you mean by line 156?

You haven't posted any code, so I'm just guessing that's where your problem. (That was another hint)

Hi I have the same problem....

I have the same answer.

POST CODE

ok the code is :

#include <SoftwareSerial.h>
#include <string.h> 
#include <TinyGPS.h>
SoftwareSerial Sim900Serial(2, 3);
byte buffer[64];                             // buffer array for data recieve over serial port
int count=0;                                 // counter for buffer array
SoftwareSerial GPS(4, 5);
TinyGPS gps;
unsigned long fix_age;
long lat, lon;
float LAT, LON;
void gpsdump(TinyGPS &gps);
bool feedgps();
void getGPS();
void setup()
{
  Sim900Serial.begin(19200);     // the SIM900 baud rate
  GPS.begin(9600);                   // GPS module baud rate  
  Serial.begin(9600);                  // the Serial port of Arduino baud rate.
  delay(500);
  Sim900_Inti();
}
 
void loop()
{
  Sim900Serial.listen();
  if (Sim900Serial.available())                     // If date is comming from from GSM shield)
  {
    while(Sim900Serial.available())              // reading data into char array 
    {
      buffer[count ]=Sim900Serial.read();  // writing data into array
      if(count == 64)break;
     }
    Serial.write(buffer,count);                     // if no data transmission ends, write buffer to hardware serial port
    Cmd_Read_Act();                               //Read the 'COMMAND' sent to SIM900 through SMS
    clearBufferArray();                               // call clearBufferArray function to clear the storaged data from the array
    count = 0;                                          // set counter of while loop to zero
 
 
  }
  if (Serial.available())                       // if data is available on hardwareserial port ==> data is comming from PC or notebook
    Sim900Serial.println(Serial.read());       // write it to the GPRS shield
}
void clearBufferArray()                             // function to clear buffer array
{
  for (int i=0; i<count;i )
    { buffer[i]=NULL;}                                // clear all index of array with command NULL
}
void Sim900_Inti(void)
{
  Sim900Serial.println("AT CMGF=1");    // Set GSM shield to sms mode
  Serial.println("AT CMGF=1");
  delay(500);
  Sim900Serial.println("AT CNMI=2,2");
  Serial.println("AT CMGF=1");
  delay(500);
}
void Cmd_Read_Act(void)                       //Function reads the SMS sent to SIM900 shield.
{ 
  char buffer2[64];
  for (int i=0; i<count;i )
  { buffer2[i]=char(buffer[i]);}  
    
  if (strstr(buffer2,"INSTRUCTABLES"))    //Comparing password entered with password stored in program  
  {
      Serial.println("Password Authenticated.");
      Serial.println("Sending reply SMS. ");
      SendTextMessage();            
  }
  
}
void SendTextMessage()
{
  
  
Sim900Serial.print("AT CMGF=1\r");    //Sending the SMS in text mode
delay(100);
Sim900Serial.println("AT CMGS = \"**********\"");//The predefined phone number
delay(100);
Sim900Serial.println("Please wait while Module calculates position");//the content of the message
delay(100);
Sim900Serial.println((char)26);//the ASCII code of the ctrl z is 26
delay(100);
Sim900Serial.println();
int counter=0;
GPS.listen();


for (;;)
{
   long lat, lon;
   unsigned long fix_age, time, date, speed, course;
   unsigned long chars;
   unsigned short sentences, failed_checksum;
   long Latitude, Longitude;
    
   // retrieves /- lat/long in 100000ths of a degree
   gps.get_position(&lat, &lon, &fix_age);
   getGPS();
   Serial.print("Latitude : ");
   Serial.print(LAT/1000000,7);
   Serial.print(" :: Longitude : ");
   Serial.println(LON/1000000,7);
   if (LAT == 0 && LON == 0)
  {
    continue;    
  } 
  counter ;
  if (counter<30)
  {
    continue;    
  }
  
  Sim900Serial.print("AT CMGF=1\r");    //Sending the SMS in text mode
  delay(100);
  Sim900Serial.println("AT CMGS = \"**********\"");//The predefined phone number
  delay(100);
  Sim900Serial.print("Latitude : ");
  Sim900Serial.print(LAT/1000000,7);
  Sim900Serial.print(" :: Longitude : ");
  Sim900Serial.println(LON/1000000,7);//the content of the message
  delay(100);
  Sim900Serial.println((char)26);//the ASCII code of the ctrl z is 26
  delay(100);
  Sim900Serial.println();
  counter=0;
  break;
 }      
}

void getGPS()
{
   bool newdata = false;
   unsigned long start = millis();
   while (millis() - start < 1000)
   {
      if (feedgps ())
      {
         newdata = true;
       }
     }
     if (newdata)
   {
      gpsdump(gps);
    }
}
bool feedgps()
{
   while (GPS.available())
 {
      if (gps.encode(GPS.read()))
        return true;
      }return 0;
}
void gpsdump(TinyGPS &gps)
{
   gps.get_position(&lat, &lon);
   LAT = lat;
   LON = lon;
   {
      feedgps(); 
    }
  }

And i try to do this project http://www.instructables.com/id/Athena-The-Global-Car-Tracking-System/step6/Programming-the-Arduino/
using GSM Shield telefonica.

geronatsios:
And i try to do this project http://www.instructables.com/id/Athena-The-Global-Car-Tracking-System/step6/Programming-the-Arduino/
using GSM Shield telefonica.

Well, forget all about that instructable. When i read this:

I have decided to use an LM7805 Voltage regulator to regulate the 12 volts input voltage to 5 volts. The LM7805 IC generates an output of 5 volts 0.5 amps. Since the GSM module can sometimes draw upto 2 Amperes of current, I have used 4 pcs of LM7805 IC to meet the requirement

then i stopped reading :astonished:

// Per.

ok well i have GSM Shield telefonica and SKM53 GPS what can be do now ??? I would like send Longitude and Latitude via GPRS....