diff --git a/software/BinaryCalculator.ino b/software/BinaryCalculator.ino
new file mode 100644
index 0000000..9cef924
--- /dev/null
+++ b/software/BinaryCalculator.ino
@@ -0,0 +1,305 @@
+// Buttons
+const int buttonFirstRow = A0;
+const int buttonSecondRow = A1;
+const int buttonAdd = A2;
+const int buttonSub = A3;
+const int buttonXXX = A4;
+
+const byte debounceLevel = 5;
+
+// LED Matrix
+const int driverFirstRow = 7;
+const int driverSecondRow = 6;
+const int driverResultRow = 5;
+
+const int driverBit0Column = 8;
+const int driverBit1Column = 9;
+const int driverBit2Column = 10;
+const int driverBit3Column = 11;
+const int driverBit4Column = 12;
+
+// Calculator Variables
+byte FirstValue = 0;
+byte SecondValue = 0;
+byte ResultValue = 0;
+
+// Matrix Variables
+byte ActiveRow = 0;  // 0 = FirstRow, 1 = SecondRow, 2 = ResultRow
+
+// Timer Variables
+unsigned long currentMillis;
+unsigned long previousMillis;
+
+// Button debounce
+byte buttonFirstRowDebounceCounter = 0;
+byte buttonSecondRowDebounceCounter = 0;
+byte buttonAddDebounceCounter = 0;
+byte buttonSubDebounceCounter = 0;
+byte buttonXXXDebounceCounter = 0;
+
+// Button States
+bool buttonFirstRowPressed = false;
+bool buttonSecondRowPressed = false;
+bool buttonAddPressed = false;
+bool buttonSubPressed = false;
+bool buttonXXXPressed = false;
+
+//
+unsigned int startupCounter = 1;
+
+//
+// Setup Routine (started o)
+// 
+
+void setup() {
+  // Setup Buttons
+  pinMode(buttonFirstRow, INPUT_PULLUP);
+  pinMode(buttonSecondRow, INPUT_PULLUP);
+  pinMode(buttonAdd, INPUT_PULLUP);
+  pinMode(buttonSub, INPUT_PULLUP);
+  pinMode(buttonXXX, INPUT_PULLUP);
+
+  // Setup LED Matrix
+  pinMode(driverFirstRow, OUTPUT);
+  digitalWrite(driverFirstRow, LOW);
+  pinMode(driverSecondRow, OUTPUT);
+  digitalWrite(driverSecondRow, LOW);
+  pinMode(driverResultRow, OUTPUT);
+  digitalWrite(driverResultRow, LOW);
+  pinMode(driverBit0Column, OUTPUT);
+  digitalWrite(driverBit0Column, LOW);
+  pinMode(driverBit1Column, OUTPUT);
+  digitalWrite(driverBit1Column, LOW);
+  pinMode(driverBit2Column, OUTPUT);
+  digitalWrite(driverBit2Column, LOW);
+  pinMode(driverBit3Column, OUTPUT);
+  digitalWrite(driverBit3Column, LOW);
+  pinMode(driverBit4Column, OUTPUT);
+  digitalWrite(driverBit4Column, LOW);
+
+  // save current Timestamp to start first Task in 10ms
+  previousMillis = millis(); 
+}
+
+//
+// Main Program (Loop)
+//
+
+void loop() {
+  // get current Timestamp
+  currentMillis = millis(); 
+
+  // Enter this Statement if 10ms difference between both timestamps
+  if ((unsigned long)(currentMillis - previousMillis) >= 3) {
+
+    if (startupCounter > 0) {
+      
+      StartupAnimationTask();
+    } else {
+      // Check if any button is pressed
+      ButtonTask();
+    }
+
+    // Update LED Matrix
+    LEDMatrixTask();    
+
+    // save current Timestamp to trigger next Task in 10ms
+    previousMillis = currentMillis;
+  }
+}
+
+//
+// SubRoutines
+//
+
+void ButtonTask() {
+  //
+  ReadButtonsDebounced();
+
+  if (buttonFirstRowPressed) {
+    buttonFirstRowPressed = false;
+    FirstValue++;
+    if (FirstValue > 0x0F) {
+      FirstValue = 0;
+    }
+  } 
+
+  if (buttonSecondRowPressed) {
+    buttonSecondRowPressed = false;
+    SecondValue++;
+    if (SecondValue > 0x0F) {
+      SecondValue = 0;
+    }
+  } 
+
+  if (buttonAddPressed) {
+    buttonAddPressed = false;
+    ResultValue = FirstValue + SecondValue;
+  }
+
+  if (buttonSubPressed) {
+    buttonSubPressed = false;
+    ResultValue = FirstValue - SecondValue;
+  }
+
+  if (buttonXXXPressed) {
+    buttonXXXPressed = false;
+    // Program here your own function
+    ResultValue = FirstValue xor SecondValue;
+  }
+}
+
+void ReadButtonsDebounced() {
+  // First Row Button
+  if (digitalRead(buttonFirstRow) == LOW) {
+    if (buttonFirstRowDebounceCounter < debounceLevel) {
+      buttonFirstRowDebounceCounter++;
+    }
+  } else {
+    if (buttonFirstRowDebounceCounter >= debounceLevel) {
+      buttonFirstRowPressed = true;
+    }
+    buttonFirstRowDebounceCounter = 0;
+  }
+
+  // Second Row Button
+  if (digitalRead(buttonSecondRow) == LOW) {
+    if (buttonSecondRowDebounceCounter < debounceLevel) {
+      buttonSecondRowDebounceCounter++;
+    }
+  } else {
+    if (buttonSecondRowDebounceCounter >= debounceLevel) {
+      buttonSecondRowPressed = true;
+    }
+    buttonSecondRowDebounceCounter = 0;
+  }
+
+  // Add Button
+  if (digitalRead(buttonAdd) == LOW) {
+    if (buttonAddDebounceCounter < debounceLevel) {
+      buttonAddDebounceCounter++;
+    }
+  } else {
+    if (buttonAddDebounceCounter >= debounceLevel) {
+      buttonAddPressed = true;
+    }
+    buttonAddDebounceCounter = 0;
+  }
+
+  // Sub Button
+  if (digitalRead(buttonSub) == LOW) {
+    if (buttonSubDebounceCounter < debounceLevel) {
+      buttonSubDebounceCounter++;
+    }
+  } else {
+    if (buttonSubDebounceCounter >= debounceLevel) {
+      buttonSubPressed = true;
+    }
+    buttonSubDebounceCounter = 0;
+  }
+
+  // XXX Button
+  if (digitalRead(buttonXXX) == LOW) {
+    if (buttonXXXDebounceCounter < debounceLevel) {
+      buttonXXXDebounceCounter++;
+    }
+  } else {
+    if (buttonXXXDebounceCounter >= debounceLevel) {
+      buttonXXXPressed = true;
+    }
+    buttonXXXDebounceCounter = 0;
+  }
+}
+
+void LEDMatrixTask() {
+  if (ActiveRow == 0) {
+    DisplayValueInRow(driverFirstRow, FirstValue);
+    ActiveRow = 1;
+  } else if (ActiveRow == 1) {
+    DisplayValueInRow(driverSecondRow, SecondValue);    
+    ActiveRow = 2;
+  } else {
+    DisplayValueInRow(driverResultRow, ResultValue);
+    ActiveRow = 0;
+  }
+}
+
+void DisplayValueInRow(int row, byte value) {
+  // disable all rows
+  digitalWrite(driverFirstRow, LOW);
+  digitalWrite(driverSecondRow, LOW);
+  digitalWrite(driverResultRow, LOW);
+  
+  // set new value
+  if (bitRead(value,0) == 1) {
+    digitalWrite(driverBit0Column, HIGH);
+  } else {
+    digitalWrite(driverBit0Column, LOW);
+  }
+  if (bitRead(value,1) == 1) {
+    digitalWrite(driverBit1Column, HIGH);
+  } else {
+    digitalWrite(driverBit1Column, LOW);
+  }
+  if (bitRead(value,2) == 1) {
+    digitalWrite(driverBit2Column, HIGH);
+  } else {
+    digitalWrite(driverBit2Column, LOW);
+  }
+  if (bitRead(value,3) == 1) {
+    digitalWrite(driverBit3Column, HIGH);
+  } else {
+    digitalWrite(driverBit3Column, LOW);
+  }
+  if (bitRead(value,4) == 1) {
+    digitalWrite(driverBit4Column, HIGH);
+  } else {
+    digitalWrite(driverBit4Column, LOW);
+  }
+  
+  // enable row
+  digitalWrite(row, HIGH);
+}
+
+void StartupAnimation() {
+  startupCounter++;
+
+  if (startupCounter < 150) {
+    FirstValue = 15;
+    SecondValue = 0;
+    ResultValue = 0;
+  } else if (startupCounter < 300) {
+    FirstValue = 0;
+    SecondValue = 15;
+    ResultValue = 0;
+  } else if (startupCounter < 450) {
+    FirstValue = 0;
+    SecondValue = 0;
+    ResultValue = 31;
+  } else if (startupCounter < 600) {
+    FirstValue = 1;
+    SecondValue = 1;
+    ResultValue = 1;
+  } else if (startupCounter < 750) {
+    FirstValue = 2;
+    SecondValue = 2;
+    ResultValue = 2;
+  } else if (startupCounter < 900) {
+    FirstValue = 4;
+    SecondValue = 4;
+    ResultValue = 4;
+  } else if (startupCounter < 1050) {
+    FirstValue = 8;
+    SecondValue = 8;
+    ResultValue = 8;
+  } else if (startupCounter < 1200) {
+    FirstValue = 0;
+    SecondValue = 0;
+    ResultValue = 16;
+  } else if (startupCounter < 1350) {
+    FirstValue = 0;
+    SecondValue = 0;
+    ResultValue = 0;
+    startupCounter = 0;
+  }
+}