diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..9a81de6
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+Unittest.h
diff --git a/AFArray.h b/AFArray.h
index ab543c0..3370004 100644
--- a/AFArray.h
+++ b/AFArray.h
@@ -1,13 +1,20 @@
-#ifndef AFArray_H
-#define AFArray_H
+#ifndef AFARRAY_H
+#define AFARRAY_H
 
+#include "ArduinoBoardManager/ArduinoBoardManager.h"
 #include "GenericIterator.h"
 
 #define INIT_DIMENSION 20
-#define MAX_LENGTH_ARRAY 160
+#define OFFSET_SRAM 100
 
 template <typename T> class AFArray : public GenericIterator<T>{
 
+  private:
+
+    static unsigned int MAX_LENGTH_ARRAY;
+
+    static unsigned int get_free_ram();
+
   protected:
 
     T* arr;
@@ -26,23 +33,23 @@ template <typename T> class AFArray : public GenericIterator<T>{
 
     AFArray();
 
-    AFArray(AFArray<T>*);
+    AFArray(const AFArray<T>*);
 
-    AFArray(T*, const unsigned int);
+    AFArray(const T*, const unsigned int);
 
     ~AFArray();
 
     //Some useful functions
 
-    AFArray<unsigned int>& find(T);
+    AFArray<unsigned int>& find(const T);
 
     AFArray<T>& slice(const unsigned int, const unsigned int, const unsigned int = 1);
 
     T* to_array(int * = -1);
 
-    bool add(T);
+    bool add(const T);
 
-    bool set(const unsigned int, T);
+    bool set(const unsigned int, const T);
 
     AFArray<T>& get_from_indexes(AFArray<unsigned int>&);
 
@@ -52,7 +59,7 @@ template <typename T> class AFArray : public GenericIterator<T>{
 
     unsigned int size();
 
-    unsigned int n_occurrences (T);
+    unsigned int n_occurrences (const T);
 
     bool is_full();
 
@@ -74,22 +81,26 @@ template <typename T> class AFArray : public GenericIterator<T>{
 
     AFArray<T>& operator=(AFArray<T>&);
 
-    AFArray<T>& operator+(T);
+    AFArray<T>& operator+(const T);
 
     AFArray<T>& operator+(AFArray<T>&);
 
-    AFArray<T>& operator+=(T);
+    AFArray<T>& operator+=(const T);
 
     AFArray<T>& operator+=(AFArray<T>&);
 
 };
 
+template <class T>
+unsigned int AFArray<T>::MAX_LENGTH_ARRAY;
+
 template <class T>
 void AFArray<T>::init(){
   arr = new T[real_len = INIT_DIMENSION];
   n = 0;
   index = 0;
   GenericIterator<T>::index_iterator = 0;
+  MAX_LENGTH_ARRAY = ArduinoBoardManager::SRAM_SIZE / 2;
 }
 
 template <class T>
@@ -101,7 +112,7 @@ void inline AFArray<T>::incr(){
 
 template <class T>
 void AFArray<T>::amortize(){
-  if (real_len == MAX_LENGTH_ARRAY)
+  if (real_len == MAX_LENGTH_ARRAY || get_free_ram() < OFFSET_SRAM)
     return;
   T copy_arr[real_len];
   for (unsigned int i=0; i<n; i++){
@@ -143,12 +154,12 @@ AFArray<T>::AFArray(){
 }
 
 template <class T>
-AFArray<T>::AFArray(AFArray<T>* acopy){
+AFArray<T>::AFArray(const AFArray<T>* acopy){
   (*this) = (*acopy);
 }
 
 template <class T>
-AFArray<T>::AFArray(T* acopy, const unsigned int len){
+AFArray<T>::AFArray(const T* acopy, const unsigned int len){
   init();
   for (unsigned int i=0; i<len; i++){
     add(acopy[i]);
@@ -173,7 +184,7 @@ bool AFArray<T>::add(T el){
 }
 
 template <class T>
-bool AFArray<T>::set(const unsigned int index, T el){
+bool AFArray<T>::set(const unsigned int index, const T el){
   if (!is_valid_index(index))
     return false;
   arr[index] = el;
@@ -192,7 +203,7 @@ unsigned int AFArray<T>::size(){
 }
 
 template <class T>
-unsigned int AFArray<T>::n_occurrences (T el){
+unsigned int AFArray<T>::n_occurrences (const T el){
   return find(el).size();
 }
 
@@ -202,7 +213,7 @@ bool AFArray<T>::is_full(){
 }
 
 template <class T>
-AFArray<unsigned int>& AFArray<T>::find(T el){
+AFArray<unsigned int>& AFArray<T>::find(const T el){
   AFArray<unsigned int> index_list;
   for (unsigned int i=0; i<size(); i++){
     if (el == arr[i])
@@ -242,7 +253,7 @@ AFArray<T>& AFArray<T>::operator=(AFArray<T>& el){
 }
 
 template <class T>
-AFArray<T>& AFArray<T>::operator+(T el){
+AFArray<T>& AFArray<T>::operator+(const T el){
   add(el);
   return *this;
 }
@@ -262,7 +273,7 @@ AFArray<T>& AFArray<T>::operator+=(AFArray<T>& el){
 }
 
 template <class T>
-AFArray<T>& AFArray<T>::operator+=(T el){
+AFArray<T>& AFArray<T>::operator+=(const T el){
   (*this) = (*this) + el;
   return *this;
 }
@@ -316,4 +327,11 @@ T* AFArray<T>::to_array(int *len){
   return buffer;
 }
 
+template <class T>
+unsigned int AFArray<T>::get_free_ram(){
+  extern int __heap_start, *__brkval;
+  int v;
+  return (int) &v - (__brkval == 0 ? (int) &__heap_start : (int) __brkval);
+}
+
 #endif
diff --git a/AFArrayType.h b/AFArrayType.h
new file mode 100644
index 0000000..50ae237
--- /dev/null
+++ b/AFArrayType.h
@@ -0,0 +1,218 @@
+#ifndef AFARRAYTYPE_H
+#define AFARRAYTYPE_H
+
+#include <Arduino.h>
+#include "AFArray.h"
+
+class AFALong : public AFArray<long>{
+
+  public:
+
+    AFALong& operator=(AFArray<long>&);
+
+};
+
+AFALong& AFALong::operator=(AFArray<long>& el){
+  AFArray<long>::operator=(el);
+  return *this;
+}
+
+class AFAULong : public AFArray<unsigned long>{
+
+  public:
+
+    AFAULong& operator=(AFArray<unsigned long>&);
+
+};
+
+AFAULong& AFAULong::operator=(AFArray<unsigned long>& el){
+  AFArray<unsigned long>::operator=(el);
+  return *this;
+}
+
+class AFAInt : public AFArray<int>{
+
+  public:
+
+    AFAInt& operator=(AFArray<int>&);
+
+};
+
+AFAInt& AFAInt::operator=(AFArray<int>& el){
+  AFArray<int>::operator=(el);
+  return *this;
+}
+
+class AFAUInt : public AFArray<unsigned int>{
+
+    public:
+
+      AFAUInt& operator=(AFArray<unsigned int>&);
+
+};
+
+AFAUInt& AFAUInt::operator=(AFArray<unsigned int>& el){
+  AFArray<unsigned int>::operator=(el);
+  return *this;
+}
+
+class AFAFloat : public AFArray<float>{
+
+  public:
+
+    AFAFloat& operator=(AFArray<float>&);
+
+};
+
+AFAFloat& AFAFloat::operator=(AFArray<float>& el){
+  AFArray<float>::operator=(el);
+  return *this;
+}
+
+class AFADouble : public AFArray<double>{
+
+  public:
+
+    AFADouble& operator=(AFArray<double>&);
+
+};
+
+AFADouble& AFADouble::operator=(AFArray<double>& el){
+  AFArray<double>::operator=(el);
+  return *this;
+}
+
+class AFAChar : public AFArray<char>{
+
+  public:
+
+    AFAChar& operator=(AFArray<char>&);
+
+};
+
+AFAChar& AFAChar::operator=(AFArray<char>& el){
+  AFArray<char>::operator=(el);
+  return *this;
+}
+
+
+class AFAString : public AFArray<String>{
+
+  public:
+
+    static AFAString& explode(const String&, const String&);
+
+    static AFAString& explode(const char, const String&);
+
+    static AFAString& explode(const char*, const String&);
+
+    static String implode(const String&, AFAString&);
+
+    static String implode(const char, AFAString&);
+
+    static String implode(const char*, AFAString&);
+
+    String implode(const String&);
+
+    String implode(const char);
+
+    String implode(const char*);
+
+    AFAString& operator=(AFArray<String>&);
+
+    //TODO:
+
+    AFAString& operator=(AFArray<int>&);
+
+    AFAString& operator=(AFArray<unsigned int>&);
+
+    AFAString& operator=(AFArray<long>&);
+
+    AFAString& operator=(AFArray<unsigned long>&);
+
+    AFAString& operator=(AFArray<float>&);
+
+    AFAString& operator=(AFArray<double>&);
+
+    AFAString& operator=(AFArray<char>&);
+
+};
+
+AFAString& AFAString::explode(const String& delimiter, const String& s){
+  AFAString* explosion = new AFAString;
+  String group_set = "";
+  unsigned int length = s.length(), length_del = delimiter.length(), i = 0;
+  bool is_del = false;
+  while(i < s.length()){
+    if (i+length_del-1 < length){ // delimiter?
+      unsigned int j = i, k = 0;
+      is_del = true;
+      while (k < length_del){
+        if (delimiter[k] != s[j]){
+          is_del = false;
+          break;
+        }
+        j++;
+        k++;
+      }//while
+      if (is_del){
+        explosion->add(group_set);
+        group_set = "";
+        i = i+length_del;
+        if (i >= length)
+          break;
+        is_del = false;
+      }
+    }//if
+    group_set += s[i];
+    i++;
+  }//while
+  if (group_set.length() > 0 || is_del)
+    explosion->add(group_set);
+  return *explosion;
+}
+
+AFAString& AFAString::explode(const char delimiter, const String& s){
+  return AFAString::explode(String(delimiter), s);
+}
+
+AFAString& AFAString::explode(const char* delimiter, const String& s){
+  return AFAString::explode(String(delimiter), s);
+}
+
+String AFAString::implode(const String& glue, AFAString& list){
+  if (list.size() == 0)
+    return "";
+  String glued = list[1];
+  for (unsigned int i=1; i<list.size(); i++){
+    glued += (glue + list[i]);
+  }
+  return glued;
+}
+
+String AFAString::implode(const char delimiter, AFAString& s){
+  return AFAString::implode(String(delimiter), s);
+}
+
+String AFAString::implode(const char* delimiter, AFAString& s){
+  return AFAString::implode(String(delimiter), s);
+}
+
+String AFAString::implode(const String& delimiter){
+  return AFAString::implode(delimiter, *this);
+}
+
+String AFAString::implode(const char delimiter){
+  return AFAString::implode(String(delimiter));
+}
+
+String AFAString::implode(const char* delimiter){
+  return AFAString::implode(String(delimiter));
+}
+
+AFAString& AFAString::operator=(AFArray<String>& el){
+  AFArray<String>::operator=(el);
+  return *this;
+}
+
+#endif
diff --git a/ArduinoBoardManager b/ArduinoBoardManager
new file mode 160000
index 0000000..2b7be8a
--- /dev/null
+++ b/ArduinoBoardManager
@@ -0,0 +1 @@
+Subproject commit 2b7be8a3c9a8b0ed30a3ce7cd093c98d77912804