diff --git a/src/knx_facade.h b/src/knx_facade.h
index d059a17..5328ac9 100644
--- a/src/knx_facade.h
+++ b/src/knx_facade.h
@@ -31,7 +31,7 @@ template <class P, class B> class KnxFacade : private SaveRestore
         manufacturerId(0xfa);
         _bau.addSaveRestore(this);
     }
-    
+
     virtual ~KnxFacade()
     {
         if (_bauPtr)
@@ -61,27 +61,27 @@ template <class P, class B> class KnxFacade : private SaveRestore
     {
         return _bau.enabled();
     }
-    
+
     void enabled(bool value)
     {
         _bau.enabled(true);
     }
-    
+
     bool progMode()
     {
         return _bau.deviceObject().progMode();
     }
-    
+
     void progMode(bool value)
     {
         _bau.deviceObject().progMode(value);
     }
-    
+
     bool configured()
     {
         return _bau.configured();
     }
-    
+
     /**
      * returns HIGH if led is active on HIGH, LOW otherwise
      */
@@ -89,7 +89,7 @@ template <class P, class B> class KnxFacade : private SaveRestore
     {
         return _ledPinActiveOn;
     }
-    
+
     /**
      * Sets if the programming led is active on HIGH or LOW. 
      * 
@@ -99,42 +99,60 @@ template <class P, class B> class KnxFacade : private SaveRestore
     {
         _ledPinActiveOn = value;
     }
-    
+
     uint32_t ledPin()
     {
         return _ledPin;
     }
-    
+
     void ledPin(uint32_t value)
     {
         _ledPin = value;
     }
-    
+
+    /**
+     * returns RISING if interrupt is created in a rising signal, FALLING otherwise
+     */
+    uint32_t buttonPinInterruptOn()
+    {
+        return _buttonPinInterruptOn;
+    }
+
+    /**
+     * Sets if the programming button creates a RISING or a FALLING signal. 
+     * 
+     * Set to RISING for GPIO--BUTTON--VDD or to FALLING for GPIO--BUTTON--GND
+     */
+    void buttonPinInterruptOn(uint32_t value)
+    {
+        _buttonPinInterruptOn = value;
+    }
+
     uint32_t buttonPin()
     {
         return _buttonPin;
     }
-    
+
     void buttonPin(uint32_t value)
     {
         _buttonPin = value;
     }
-    
+
     void readMemory()
     {
         _bau.readMemory();
     }
-    
+
     void writeMemory()
     {
         _bau.writeMemory();
     }
-    
+
     uint16_t induvidualAddress()
     {
         return _bau.deviceObject().induvidualAddress();
     }
-    
+
     void loop()
     {
         if (progMode() != _progLedState)
@@ -158,32 +176,32 @@ template <class P, class B> class KnxFacade : private SaveRestore
         }
         _bau.loop();
     }
-    
+
     void manufacturerId(uint16_t value)
     {
         _bau.deviceObject().manufacturerId(value);
     }
-    
+
     void bauNumber(uint32_t value)
     {
         _bau.deviceObject().bauNumber(value);
     }
-    
+
     void orderNumber(const char* value)
     {
         _bau.deviceObject().orderNumber(value);
     }
-    
+
     void hardwareType(uint8_t* value)
     {
         _bau.deviceObject().hardwareType(value);
     }
-    
+
     void version(uint16_t value)
     {
         _bau.deviceObject().version(value);
     }
-    
+
     void start()
     {
         pinMode(_ledPin, OUTPUT);
@@ -192,20 +210,20 @@ template <class P, class B> class KnxFacade : private SaveRestore
 
         pinMode(_buttonPin, INPUT_PULLUP);
 
-        attachInterrupt(_buttonPin, buttonUp, RISING);
+        attachInterrupt(_buttonPin, buttonUp, _buttonPinInterruptOn);
         enabled(true);
     }
-    
+
     void setSaveCallback(saveRestoreCallback func)
     {
         _saveCallback = func;
     }
-    
+
     void setRestoreCallback(saveRestoreCallback func)
     {
         _restoreCallback = func;
     }
-    
+
     uint8_t* paramData(uint32_t addr)
     {
         if (!_bau.configured())
@@ -213,7 +231,7 @@ template <class P, class B> class KnxFacade : private SaveRestore
 
         return _bau.parameters().data(addr);
     }
-    
+
     uint8_t paramByte(uint32_t addr)
     {
         if (!_bau.configured())
@@ -229,7 +247,7 @@ template <class P, class B> class KnxFacade : private SaveRestore
 
         return _bau.parameters().getWord(addr);
     }
-    
+
     uint32_t paramInt(uint32_t addr)
     {
         if (!_bau.configured())
@@ -237,12 +255,12 @@ template <class P, class B> class KnxFacade : private SaveRestore
 
         return _bau.parameters().getInt(addr);
     }
-    
+
     GroupObject& getGroupObject(uint16_t goNr)
     {
         return _bau.groupObjectTable().get(goNr);
     }
-    
+
     void restart(uint16_t individualAddress)
     {
         _bau.restartRequest(individualAddress);
@@ -252,14 +270,15 @@ template <class P, class B> class KnxFacade : private SaveRestore
     P* _platformPtr = 0;
     B* _bauPtr = 0;
     B& _bau;
-	uint32_t _ledPinActiveOn = LOW;
+    uint32_t _ledPinActiveOn = LOW;
     uint32_t _ledPin = LED_BUILTIN;
+    uint32_t _buttonPinInterruptOn = RISING;
     uint32_t _buttonPin = 0;
     saveRestoreCallback _saveCallback = 0;
     saveRestoreCallback _restoreCallback = 0;
     bool _toogleProgMode = false;
     bool _progLedState = false;
-    
+
     uint8_t* save(uint8_t* buffer)
     {
         if (_saveCallback != 0)
@@ -267,7 +286,7 @@ template <class P, class B> class KnxFacade : private SaveRestore
 
         return buffer;
     }
-    
+
     uint8_t* restore(uint8_t* buffer)
     {
         if (_restoreCallback != 0)