diff --git a/FlippR-Driver/contrib/uml/OutputItem_SequenceDiagram.puml b/FlippR-Driver/contrib/uml/OutputItem_SequenceDiagram.puml
new file mode 100644
index 0000000..5d4ce05
--- /dev/null
+++ b/FlippR-Driver/contrib/uml/OutputItem_SequenceDiagram.puml
@@ -0,0 +1,13 @@
+@startuml
+Sound -> GPIOInterface:activate()
+GPIOInterface --> GPIOInterface:setAddress()
+GPIOInterface --> GPIOInterface:setDataPin(1)
+GPIOInterface -> Sound:done
+Sound --> Sound:sleep_for()
+Sound -> GPIOInterface:deactivate()
+GPIOInterface --> GPIOInterface:setAddress()
+GPIOInterface --> GPIOInterface:setDataPin(0)
+GPIOInterface -> Sound:done
+
+
+@enduml
\ No newline at end of file
diff --git a/FlippR-Driver/src/output/items/IOutputItem.h b/FlippR-Driver/src/output/items/IItem.h
similarity index 87%
rename from FlippR-Driver/src/output/items/IOutputItem.h
rename to FlippR-Driver/src/output/items/IItem.h
index 5f2c064..03e0942 100644
--- a/FlippR-Driver/src/output/items/IOutputItem.h
+++ b/FlippR-Driver/src/output/items/IItem.h
@@ -16,10 +16,10 @@ namespace output
 namespace items
 {
 
-class IOutputItem
+class IItem
 {
 public:
-  virtual ~IOutputItem();
+  virtual ~IItem();
   virtual void activate() = 0;
   virtual void deactivate() = 0;
 };
diff --git a/FlippR-Driver/src/output/items/OutputItem.cpp b/FlippR-Driver/src/output/items/Item.cpp
similarity index 96%
rename from FlippR-Driver/src/output/items/OutputItem.cpp
rename to FlippR-Driver/src/output/items/Item.cpp
index 1af53ea..2bc2bb5 100644
--- a/FlippR-Driver/src/output/items/OutputItem.cpp
+++ b/FlippR-Driver/src/output/items/Item.cpp
@@ -2,7 +2,7 @@
 // Created by rhetenor on 21.11.18.
 //
 
-#include "OutputItem.h"
+#include "Item.h"
 
 namespace flippR_driver
 {
diff --git a/FlippR-Driver/src/output/items/OutputItem.h b/FlippR-Driver/src/output/items/Item.h
similarity index 97%
rename from FlippR-Driver/src/output/items/OutputItem.h
rename to FlippR-Driver/src/output/items/Item.h
index f892f60..c541762 100644
--- a/FlippR-Driver/src/output/items/OutputItem.h
+++ b/FlippR-Driver/src/output/items/Item.h
@@ -8,7 +8,7 @@
 #ifndef _SRC_OUTPUT_CABINETITEM_H_
 #define _SRC_OUTPUT_CABINETITEM_H_
 
-#include "IOutputItem.h"
+#include "IItem.h"
 
 #include "utility/IOutputGPIOInterface.h"
 
diff --git a/FlippR-Driver/src/output/items/Lamp.h b/FlippR-Driver/src/output/items/Lamp.h
index 5574b3f..a8a8494 100644
--- a/FlippR-Driver/src/output/items/Lamp.h
+++ b/FlippR-Driver/src/output/items/Lamp.h
@@ -8,7 +8,7 @@
 #ifndef _SRC_OUTPUT_LAMP_H_
 #define _SRC_OUTPUT_LAMP_H_
 
-#include "OutputItem.h"
+#include "Item.h"
 #include "output/items/ILamp.h"
 
 namespace flippR_driver
diff --git a/FlippR-Driver/src/output/items/Solenoid.h b/FlippR-Driver/src/output/items/Solenoid.h
index 02a4cb1..03b6334 100644
--- a/FlippR-Driver/src/output/items/Solenoid.h
+++ b/FlippR-Driver/src/output/items/Solenoid.h
@@ -9,7 +9,7 @@
 #define _SRC_OUTPUT_SOLENOID_H_
 
 #include "output/items/ISolenoid.h"
-#include "OutputItem.h"
+#include "Item.h"
 
 #include <future>
 #include <chrono>
diff --git a/FlippR-Driver/src/output/items/Sound.h b/FlippR-Driver/src/output/items/Sound.h
index 07cae11..f5909f0 100644
--- a/FlippR-Driver/src/output/items/Sound.h
+++ b/FlippR-Driver/src/output/items/Sound.h
@@ -9,7 +9,7 @@
 #define _SRC_OUTPUT_SOUND_H_
 
 #include "output/items/ISound.h"
-#include "OutputItem.h"
+#include "Item.h"
 
 #include <memory>
 #include <string>
diff --git a/FlippR-Driver/src/utility/GPIOInterface.h b/FlippR-Driver/src/utility/GPIOInterface.h
index 70ce909..c6e62b8 100644
--- a/FlippR-Driver/src/utility/GPIOInterface.h
+++ b/FlippR-Driver/src/utility/GPIOInterface.h
@@ -26,7 +26,7 @@ public:
   GPIOInterface();
   virtual ~GPIOInterface() {};
 
-/* todo ???? */
+protected:
   static void initialize_input_pin(char address);
 
   static void initialize_output_pin(char address);
@@ -37,6 +37,9 @@ public:
 
 public:
   static std::once_flag GPIO_LIB_INITIALIZED;
+
+private:
+  unsigned int pin_base;
 };
 
 }
diff --git a/FlippR-Driver/src/utility/IOutputGPIOInterface.h b/FlippR-Driver/src/utility/IOutputGPIOInterface.h
index d633d54..a04d196 100644
--- a/FlippR-Driver/src/utility/IOutputGPIOInterface.h
+++ b/FlippR-Driver/src/utility/IOutputGPIOInterface.h
@@ -7,7 +7,7 @@
 
 #include "IOutputGPIOInterface.h"
 
-#include "output/items/IOutputItem.h"
+#include "output/items/IItem.h"
 
 #include <memory>
 
@@ -24,8 +24,8 @@ public:
   void activate_pin(int i2c_address, int pin);
   void deactivate_pin(int i2c_address, int pin);
 
-  void activate_output_item(output::items::IOutputItem *item);
-  void deactivate_output_item(output::items::IOutputItem *item);
+  void activate_output_item(output::items::IItem *item);
+  void deactivate_output_item(output::items::IItem *item);
 
   //Display gpio interface!
 };
diff --git a/FlippR-Driver/src/utility/InputGPIOInterface.cpp b/FlippR-Driver/src/utility/InputGPIOInterface.cpp
index 1553667..90d0cbf 100644
--- a/FlippR-Driver/src/utility/InputGPIOInterface.cpp
+++ b/FlippR-Driver/src/utility/InputGPIOInterface.cpp
@@ -20,9 +20,9 @@ namespace utility
 
 using namespace nlohmann;
 
-InputGPIOInterface::InputGPIOInterface(std::istream &input_config_stream)
+InputGPIOInterface::InputGPIOInterface(std::istream &input_config)
 {
-  init_members(input_config_stream);
+  init_members(input_config);
 
   init_pins();
 }
diff --git a/FlippR-Driver/src/utility/InputGPIOInterface.h b/FlippR-Driver/src/utility/InputGPIOInterface.h
index 2e0cc3b..5f392ca 100644
--- a/FlippR-Driver/src/utility/InputGPIOInterface.h
+++ b/FlippR-Driver/src/utility/InputGPIOInterface.h
@@ -20,7 +20,7 @@ namespace utility
 class InputGPIOInterface : public IInputGPIOInterface, GPIOInterface
 {
 public:
-  InputGPIOInterface(std::istream &input_config_stream);
+  InputGPIOInterface(std::istream &input_config);
   bool read_data(char pin);
 
 private:
diff --git a/FlippR-Driver/src/utility/OutputGpioInterface.cpp b/FlippR-Driver/src/utility/OutputGPIOInterface.cpp
similarity index 50%
rename from FlippR-Driver/src/utility/OutputGpioInterface.cpp
rename to FlippR-Driver/src/utility/OutputGPIOInterface.cpp
index 133b897..753e61a 100644
--- a/FlippR-Driver/src/utility/OutputGpioInterface.cpp
+++ b/FlippR-Driver/src/utility/OutputGPIOInterface.cpp
@@ -13,6 +13,25 @@ namespace utility
 {
 using namespace output::items;
 
+OutputGPIOInterface::OutputGPIOInterface(std::istream &output_config_stream)
+{
+  json output_config;
+  output_config_stream >> output_config;
+
+  parse_pin_bases(output_config);
+
+  initialize_i2c_addresses(output_config);
+
+  initialize_pins();
+}
+
+void OutputGPIOInterface::initialize_i2c_addresses(json &output_config)
+{
+  mcp23017Setup(i2c_address_driver_board, parse_i2c_address_driver_board(output_config));
+  mcp23017Setup(i2c_address_sounds, parse_i2c_address_sound_board(output_config));
+  mcp23017Setup(pin_base_displays, parse_i2c_address_display_board(output_config));
+}
+
 void OutputGPIOInterface::activate_output_item(IOutputItem *item)
 {
   std::lock_guard<std::mutex> guard(output_item_mutex);
diff --git a/FlippR-Driver/src/utility/OutputGPIOInterface.h b/FlippR-Driver/src/utility/OutputGPIOInterface.h
index c8979b5..678cacc 100644
--- a/FlippR-Driver/src/utility/OutputGPIOInterface.h
+++ b/FlippR-Driver/src/utility/OutputGPIOInterface.h
@@ -25,6 +25,8 @@ class OutputGPIOInterface : public GPIOInterface
 {
 
 public:
+  OutputGPIOInterface(std::istream &output_config_stream);
+
   virtual ~OutputGPIOInterface() = default;
 
   void activate(output::items::ISound *sound);
@@ -37,9 +39,28 @@ public:
 
   void write_display(output::items::IDisplay &display);
 
+private:
+  void parse_pin_bases(json &output_config_stream);
+  void initialize_i2c_addresses(json &output_config);
+
+  char parse_i2c_address_driver_board(json &output_config_stream);
+  char parse_i2c_address_sound_board(json &output_config_stream);
+  char parse_i2c_address_display_board(json &output_config_stream);
+
+  void initialize_pins();
+
+  void activate(output::items::IOutputItem outputItem);
+
 private:
   std::mutex output_item_mutex;
 
+  unsigned int pin_base_driver_board;
+  unsigned int pin_base_sounds;
+  unsigned int pin_base_displays;
+
+
+
+
 };
 
 }