diff --git a/FlippR-Driver/src/input/Detector.h b/FlippR-Driver/src/input/Detector.h
index 00bcf11..7feec1a 100644
--- a/FlippR-Driver/src/input/Detector.h
+++ b/FlippR-Driver/src/input/Detector.h
@@ -17,8 +17,7 @@
 #include <thread>
 #include <map>
 
-#include "../utilities/GPIOInterface.h"
-
+#include "../utilities/GPIOInterface.hpp"
 #include "InputEvent.h"
 #include "InputEventNotifier.h"
 
diff --git a/FlippR-Driver/src/utilities/GPIOInterface.cpp b/FlippR-Driver/src/utilities/GPIOInterface.cpp
deleted file mode 100644
index cd20e47..0000000
--- a/FlippR-Driver/src/utilities/GPIOInterface.cpp
+++ /dev/null
@@ -1,48 +0,0 @@
-
-/*
- * GPIOInterface.cpp
- *
- *  Created on: May 17, 2018
- *      Author: Andreas Schneider, Johannes Wendel, Jonas Zeunert, Rafael Vinci, Dr. Franca Rupprecht
- */
-
-#include "GPIOInterface.h"
-
-#include "../lib/wiringPi/wiringPi.h"
-
-GPIOInterface::GPIOInterface(std::string config_path)
-{
-}
-
-GPIOInterface::~GPIOInterface()
-{
-}
-
-bool GPIOInterface::read_input_data()
-{
-  return read_input_pin(input_data_address);
-}
-
-void GPIOInterface::write_input_row(char data)
-{
-  write_pin(input_row_address, data & 0b001);
-  write_pin(input_row_address, data & 0b010);
-  write_pin(input_row_address, data & 0b100);
-}
-
-void GPIOInterface::write_input_col(char data)
-{
-  write_pin(input_col_address, data & 0b001);
-  write_pin(input_col_address, data & 0b010);
-  write_pin(input_col_address, data & 0b100);
-}
-
-void GPIOInterface::write_pin(char address, bool data)
-{
-  digitalWrite(address, data);
-}
-
-bool GPIOInterface::read_input_pin(char address)
-{
-  return digitalRead(address);
-}
diff --git a/FlippR-Driver/src/utilities/GPIOInterface.h b/FlippR-Driver/src/utilities/GPIOInterface.h
deleted file mode 100644
index 0eba47b..0000000
--- a/FlippR-Driver/src/utilities/GPIOInterface.h
+++ /dev/null
@@ -1,48 +0,0 @@
-/*
- * GPIOInterface.hpp
- *
- * Responsible for communicating with the actual GPIO hardware.
- *
- * Gets a JSON file with following style:
- * TODO
- *
- *  Created on: May 6, 2018
- *      Author: Andreas Schneider, Johannes Wendel, Jonas Zeunert, Rafael Vinci, Dr. Franca Rupprecht
- */
-
-#ifndef SRC_UTILITIES_GPIOINTERFACE_H_
-#define SRC_UTILITIES_GPIOINTERFACE_H_
-
-#include <fstream>
-
-#include "../lib/json/json.hpp"
-
-using namespace nlohmann;
-
-class GPIOInterface
-{
-public:
-  GPIOInterface(std::string config_path);
-  ~GPIOInterface();
-
-  void write_input_row(char data);
-  void write_input_col(char data);
-  bool read_input_data();
-
-private:
-  static void write_pin(char address, bool data);
-  static bool read_input_pin(char address);
-
-private:
-  json config;
-
-  char input_row_address;
-  char input_col_address;
-  char input_data_address;
-
-};
-
-
-
-
-#endif /* SRC_UTILITIES_GPIOINTERFACE_H_ */
diff --git a/FlippR-Driver/src/utilities/GPIOInterface.hpp b/FlippR-Driver/src/utilities/GPIOInterface.hpp
new file mode 100644
index 0000000..43db3e2
--- /dev/null
+++ b/FlippR-Driver/src/utilities/GPIOInterface.hpp
@@ -0,0 +1,46 @@
+/*
+ * GPIOInterface.hpp
+ *
+ * Responsible for communicating with the actual GPIO hardware.
+ *
+ * Gets a JSON file with following style:
+ * TODO
+ *
+ *  Created on: May 6, 2018
+ *      Author: Andreas Schneider, Johannes Wendel, Jonas Zeunert, Rafael Vinci, Dr. Franca Rupprecht
+ */
+
+#ifndef SRC_UTILITIES_GPIOINTERFACE_HPP_
+#define SRC_UTILITIES_GPIOINTERFACE_HPP_
+
+#include <fstream>
+
+#include "../lib/json/json.hpp"
+#include "../lib/wiringPi/wiringPi.h"
+
+using namespace nlohmann;
+
+class GPIOInterface
+{
+public:
+  GPIOInterface(std::string config_path) = 0;
+  ~GPIOInterface();
+
+  static void write_pin(char address, char data)
+  {
+    digitalWrite(address, data);
+  }
+
+  static bool read_pin(char address)
+  {
+    return digitalRead(address);
+  }
+
+protected:
+  json config;
+};
+
+
+
+
+#endif /* SRC_UTILITIES_GPIOINTERFACE_HPP_ */
diff --git a/FlippR-Driver/src/utilities/InputGPIOInterface.cpp b/FlippR-Driver/src/utilities/InputGPIOInterface.cpp
new file mode 100644
index 0000000..db57142
--- /dev/null
+++ b/FlippR-Driver/src/utilities/InputGPIOInterface.cpp
@@ -0,0 +1,32 @@
+/*
+ * InputGPIOInterface.cpp
+ *
+ *  Created on: May 31, 2018
+ *      Author: Andreas Schneider, Johannes Wendel, Jonas Zeunert, Rafael Vinci, Dr. Franca Rupprecht
+ */
+#include "InputGPIOInterface.h"
+
+
+class InputGPIOInterface
+{
+
+bool InputGPIOInterface::read_input_data()
+{
+  return read_pin(this->input_data_address);
+}
+
+void InputGPIOInterface::write_input_row(char data)
+{
+  write_pin(this->input_row_address, data & 0b001);
+  write_pin(this->input_row_address, data & 0b010);
+  write_pin(this->input_row_address, data & 0b100);
+}
+
+void InputGPIOInterface::write_input_col(char data)
+{
+  write_pin(this->input_col_address, data & 0b001);
+  write_pin(this->input_col_address, data & 0b010);
+  write_pin(this->input_col_address, data & 0b100);
+}
+
+};
diff --git a/FlippR-Driver/src/utilities/InputGPIOInterface.h b/FlippR-Driver/src/utilities/InputGPIOInterface.h
new file mode 100644
index 0000000..0c8cabe
--- /dev/null
+++ b/FlippR-Driver/src/utilities/InputGPIOInterface.h
@@ -0,0 +1,29 @@
+/*
+ * InputGPIOInterface.h
+ *
+ *  Created on: May 31, 2018
+ *      Author: Andreas Schneider, Johannes Wendel, Jonas Zeunert, Rafael Vinci, Dr. Franca Rupprecht
+ */
+
+#ifndef SRC_UTILITIES_INPUTGPIOINTERFACE_H_
+#define SRC_UTILITIES_INPUTGPIOINTERFACE_H_
+
+#include "GPIOInterface.hpp"
+
+class InputGPIOInterface : GPIOInterface
+{
+public:
+
+  void write_input_row(char data);
+  void write_input_col(char data);
+  bool read_input_data();
+
+private:
+  char input_row_address;
+  char input_col_address;
+  char input_data_address;
+};
+
+
+
+#endif /* SRC_UTILITIES_INPUTGPIOINTERFACE_H_ */
diff --git a/FlippR-Driver/src/utilities/OutputGPIOInterface.h b/FlippR-Driver/src/utilities/OutputGPIOInterface.h
new file mode 100644
index 0000000..3b64b6e
--- /dev/null
+++ b/FlippR-Driver/src/utilities/OutputGPIOInterface.h
@@ -0,0 +1,19 @@
+/*
+ * OutputGPIOInterface.h
+ *
+ *  Created on: May 31, 2018
+ *      Author: Andreas Schneider, Johannes Wendel, Jonas Zeunert, Rafael Vinci, Dr. Franca Rupprecht
+ */
+
+#ifndef SRC_UTILITIES_OUTPUTGPIOINTERFACE_H_
+#define SRC_UTILITIES_OUTPUTGPIOINTERFACE_H_
+
+#include "GPIOInterface.hpp"
+
+class OutputGPIOInterface : GPIOInterface
+{
+
+};
+
+
+#endif /* SRC_UTILITIES_OUTPUTGPIOINTERFACE_H_ */