diff --git a/globoSonda/examples/globoSonda/globoSonda.ino b/globoSonda/examples/globoSonda/globoSonda.ino
index 952b20a..7fcdfc2 100644
--- a/globoSonda/examples/globoSonda/globoSonda.ino
+++ b/globoSonda/examples/globoSonda/globoSonda.ino
@@ -1,7 +1,7 @@
 
 //librerias externas--------------------
 #include <avr/power.h>
-#include <SD.h>
+//#include <SD.h>
 
 #include "stdio.h"
 /*
diff --git a/globoSonda/src/ArchivoSD.cpp b/globoSonda/src/ArchivoSD.cpp
index 5563019..378f3a1 100644
--- a/globoSonda/src/ArchivoSD.cpp
+++ b/globoSonda/src/ArchivoSD.cpp
@@ -1,4 +1,4 @@
-#include <SD.h>
+
 #include "ArchivoSD.h"
 
 const char * colNames[] = {"Milis", "TempExt", "Hum", "TempInt", "Alt", "Pres", "AcelX", "AcelY", "AcelZ", "MagX", "MagY", "MagZ", "gpsVal", "nSatelites", "PDOP", "HDOP", "VDOP" , "Fecha", "lat", "lon", "Alt(GPS)", "Direccion", "Velocidad"  };
diff --git a/globoSonda/src/ArchivoSD.h b/globoSonda/src/ArchivoSD.h
index 8017859..5a23c08 100644
--- a/globoSonda/src/ArchivoSD.h
+++ b/globoSonda/src/ArchivoSD.h
@@ -1,6 +1,7 @@
 
 #ifndef ArchivoSD_define
 #define ArchivoSD_define 1
+#include <SD.h>
 #include "utiles.h"
 
 #define TIMER_SMS_DATA 60000//cada 1 min
diff --git a/globoSonda/src/ReporteManager.cpp b/globoSonda/src/ReporteManager.cpp
index 82e4776..7f45ca2 100644
--- a/globoSonda/src/ReporteManager.cpp
+++ b/globoSonda/src/ReporteManager.cpp
@@ -1,4 +1,3 @@
-#include <SD.h>
 #include "ArchivoSD.h"
 #include "Sim808Manager.h"
 
diff --git a/globoSonda/src/SIM808Manager.cpp b/globoSonda/src/SIM808Manager.cpp
index 82c913d..94abfdb 100644
--- a/globoSonda/src/SIM808Manager.cpp
+++ b/globoSonda/src/SIM808Manager.cpp
@@ -236,13 +236,13 @@ char* Sim808Manager::recibe()
   return buff;
 }
 
-void Sim808Manager::envia(char* dat)
+void Sim808Manager::envia(const char* dat)
 {
   pSeria->println(dat);
   //Utiles::printCOM(dat);
 }
 
-void Sim808Manager::enviaSolo(char* dat, int  ndata)
+void Sim808Manager::enviaSolo(const char* dat, int  ndata)
 {
   for ( int i = 0; i < ndata; i++)
   {
diff --git a/globoSonda/src/SIM808Manager.h b/globoSonda/src/SIM808Manager.h
index 0092571..1039de4 100644
--- a/globoSonda/src/SIM808Manager.h
+++ b/globoSonda/src/SIM808Manager.h
@@ -51,7 +51,7 @@ class Sim808Manager
   public:
     Sim808Manager();
 
-    bool inicia(HardwareSerial *mySerial, int powerKey = -1, int baud=0);
+    bool inicia(HardwareSerial *mySerial, int powerKey, int baud);//int powerKey = -1, int baud=0
 
     bool EnviaSMS(char* tlf, char *sms);
 
@@ -63,7 +63,7 @@ class Sim808Manager
     DataGPSSimManager* GetGPS();
     
     //envio de datos
-   bool IniciaNetwork(const char* apn = 0, const char* userName = 0, const char* passWord = 0);
+   bool IniciaNetwork(const char* apn, const char* userName , const char* passWord);
    bool  connect(ProtocolSimManager ptl, const char* host, int port);
    bool send(char* str, int len);
    char* recibeDatos();
@@ -78,8 +78,8 @@ class Sim808Manager
     bool iniciaSIM();
 
     char* recibe();
-    void envia(char* dat);
-    void enviaSolo(char* dat, int  ndata);
+    void envia(const char* dat);
+    void enviaSolo(const char* dat, int  ndata);
     bool CheckAt();
     void enciende();
     bool reciveOK();
diff --git a/globoSonda/src/StatusManager.h b/globoSonda/src/StatusManager.h
index fffaac5..12fcb14 100644
--- a/globoSonda/src/StatusManager.h
+++ b/globoSonda/src/StatusManager.h
@@ -14,7 +14,7 @@ class StatusManager
     int ledGPS;
     int ledSMS;
   public:
-    StatusManager(int pinLedSD = -1, int pinLedGPS = -1, int pinLedSMS = -1);
+    StatusManager(int pinLedSD , int pinLedGPS, int pinLedSMS);
     void EmpiezaInicio();
     void FinInicio();
     void SetStatusSD(bool ok);
diff --git a/globoSonda/src/utiles.cpp b/globoSonda/src/utiles.cpp
index 8acd27f..f900f60 100644
--- a/globoSonda/src/utiles.cpp
+++ b/globoSonda/src/utiles.cpp
@@ -21,13 +21,13 @@ bool Utiles::isTime( unsigned long *tt, unsigned long timer)
   return true;
 }
 
-void Utiles::printCOM(char *line)
+void Utiles::printCOM(const char *line)
 {
   if(UtilesDebug)
     Serial.println(line);
 
 }
-void Utiles::printCOM2(char *line)
+void Utiles::printCOM2(const char *line)
 {
   if(UtilesDebug)
     Serial.print(line);
diff --git a/globoSonda/src/utiles.h b/globoSonda/src/utiles.h
index 40c2724..1b8b3fb 100644
--- a/globoSonda/src/utiles.h
+++ b/globoSonda/src/utiles.h
@@ -24,8 +24,8 @@ class Utiles
     /*
        Para imprimir por el puerto COM si esta en modo DEBUG
     */
-    static void printCOM(char *line);
-    static void printCOM2(char *line);
+    static void printCOM(const char *line);
+    static void printCOM2(const char *line);
 
 };