diff --git a/hardware/zpuino/zpu/libraries/SevenSegHW/SevenSegHW.h b/hardware/zpuino/zpu/libraries/SevenSegHW/SevenSegHW.h
index eca9e9ef118..5c641622475 100644
--- a/hardware/zpuino/zpu/libraries/SevenSegHW/SevenSegHW.h
+++ b/hardware/zpuino/zpu/libraries/SevenSegHW/SevenSegHW.h
@@ -5,7 +5,7 @@
 #include "zpuino.h"
 #endif
 
-#define SEVENSEGBASE IO_SLOT(9)
+#define SEVENSEGBASE  (this->getBaseAddress())
 #define SEVSEGDIGITO  REGISTER(SEVENSEGBASE,7)
 #define SEVSEGDIGIT1  REGISTER(SEVENSEGBASE,6)
 #define SEVSEGDIGIT2  REGISTER(SEVENSEGBASE,5)
@@ -16,39 +16,51 @@
 
 class SEVENSEGHW {
 public:
-	// Default Constructor
+    // Default Constructor
     SEVENSEGHW();
-	
-	// Set the 4 digits Int value 
+
+    // configure base address
+    void begin (int address);
+
+    // get base address
+    inline unsigned long int getBaseAddress ()
+    {
+        return this->nBaseAddress;
+    }
+
+    // Set the 4 digits Int value
     void setIntValue (unsigned int value, unsigned int pos_dot) ;
     // Set a digit value
     void setDigitValue (unsigned int value, unsigned int dot, unsigned int digit) ;
     // Set a Hexadecimal value
     void setHexValue (unsigned int value) ;
-	// Get the 4 digits Int value 
+    // Get the 4 digits Int value
     unsigned int getIntValue () ;
-	// Get a digit value 
+    // Get a digit value
     unsigned int getDigitValue (unsigned int digit) ;
     // Get Dot position
     unsigned int getDotPosition () ;
     // Set a Hexadecimal value
     void setHexValue (unsigned int value, unsigned int digit) ;
 
-	// Set Brightness
+    // Set Brightness
     void setBrightness (unsigned int value) ;
-	// Get Brightness
-	unsigned int getBrightness () ;
+    // Get Brightness
+    unsigned int getBrightness () ;
 
-	// Set Extra value
+    // Set Extra value
     void setExtra (unsigned int value);
-	// Get Extra value
-	unsigned int getExtra (); 
-	
-	
-	// enable/disable segment 
+    // Get Extra value
+    unsigned int getExtra ();
+
+
+    // enable/disable segment
     void setSegmentStatus (unsigned int enabled );
-	// get segment status 
+    // get segment status
     unsigned int getSegmentStatus ();
+
+private :
+    unsigned long int nBaseAddress;
 };
 
 #endif