Problem including SD.h library

Projects Programming
1

Hi,

I'm trying to get consumption information from my electricity meter and to store it on the SD card embedded on the Ethernet shield.
I managed to get consumption information from my electricity meter and to display it through serial monitor adding the UTC timestamp.
The problem happens when I include SD.h library. I just manage to display the end of the consumption frame.
Could you help me?

Here is my source code :

//include Téléinformation
#include <SoftwareSerial.h>

//include RTC
#include <Wire.h>
#include "RTClib.h"

//include SD
//#include <SD.h>
#include <SPI.h>

//Variable globale pour le module RTC
RTC_DS1307 RTC;

//Variable de récupération du compteur1
SoftwareSerial cptSerial_1(2, 3);

/*
//Variable SD
Sd2Card card;
SdVolume volume;
SdFile root;
File myfile;
*/


/******************************* Setup *******************************/
//Setup Global
void setup() {
        setupRTC();
        //setupSD();
        Serial.begin(1200);     // opens serial port, sets data rate to 1200 bps
        cptSerial_1.begin(1200);
}

//Setup RTC module
void setupRTC()
{
 Wire.begin();
 RTC.begin();
 if (! RTC.isrunning()) 
 {
   Serial.println("RTC is NOT running!");
   // following line sets the RTC to the date & time this sketch was compiled
   // RTC.adjust(DateTime(__DATE__, __TIME__));
 }
}

/******************************* Main *******************************/
void loop() {
  Serial.println(getTeleInfo(cptSerial_1));
}

String getTeleInfo(SoftwareSerial &cptSerial)
{
  char tmp=' ';
  String ReturnValue = String("");

  //Attendre la fin de la trame en cours
  while (tmp!=char(2))
  {
    if (cptSerial.available()) 
    {
      tmp=cptSerial.read() & 0x7F;
    }
  }
  
  //une fois char(2) passé, attendre char(10)
  while (tmp!=char(10))
  {
    if (cptSerial.available()) 
    {
      tmp=cptSerial.read() & 0x7F;
    }
  }

  //Récupérer la Trame en remplaçant les char(10) par des ';'
  while (tmp!=char(2))
  {
    //Attendre le prochain caractère
    while (!cptSerial.available()) 
    {}
    if(cptSerial.available())
    {
      tmp=cptSerial.read() & 0x7F;
    }
    
    //Remplacer les Char(10) par ";"
    if(tmp==char(10))
    {
      ReturnValue = ReturnValue + ';';
    }
    else
    {
      //Eliminer les caractères inutiles
      if(tmp > 31) // and tmp < 127)
      {
        ReturnValue = ReturnValue + tmp;
      }
    }
  }
  //Intégrer la date à la sortie
  ReturnValue = ReturnValue + ";" + RTC.now().unixtime() + " UTC";
  return ReturnValue;
}

Here is the result without including SD.h

ADCO 031128380698 H;OPTARIF HC.. <;ISOUSC 45 ?;HCHC 000000000 F;HCHP 000000000 S;PTEC HP.. ;IINST 000 W;IMAX 000 ?;PAPP 00000 !;HHPHC A ,;MOTDETAT 000000 B;1353536567 UTC
ADCO 031128380698 H;OPTARIF HC.. <;ISOUSC 45 ?;HCHC 000000000 F;HCHP 000000000 S;PTEC HP.. ;IINST 000 W;IMAX 000 ?;PAPP 00000 !;HHPHC A ,;MOTDETAT 000000 B;1353536570 UTC
ADCO 031128380698 H;OPTARIF HC.. <;ISOUSC 45 ?;HCHC 000000000 F;HCHP 000000000 S;PTEC HP.. ;IINST 000 W;IMAX 000 ?;PAPP 00000 !;HHPHC A ,;MOTDETAT 000000 B;1353536574 UTC

And the result with SD.h includes

,;MOTDETAT 000000 B;1353536669 UTC
,;MOTDETAT 000000 B;1353536672 UTC
,;MOTDETAT 000000 B;1353536675 UTC

I'm using the assembly that is described here (in french) : blog.cquad.eu/2012/02/02/recuperer-la-teleinformation-avec-un-arduino/

Adrien

2

If that is an Uno, you are probably running out of SRAM. There is not enough memory to return that string from that call when you add the SD library.

3

You can use the SD library OR you can shoot yourself in the foot using the String class. Your choice.

4

You're right SurferTim, I’m using an ARDUINO UNO with ethernet shield.

So I just have to stop using String Library and replace it by characters arrays.

Thank you all. I going to test that.

Adrien