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diff --git a/Design/~$Layout.xlsx b/Design/~$Layout.xlsx
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diff --git a/firmware/keyboard/keyboard.ino b/firmware/keyboard/keyboard.ino
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+++ b/firmware/keyboard/keyboard.ino
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+#include <Keypad.h>
+
+const byte ROWS = 4; // Four rows
+const byte COLS = 3; // Three columns
+// Define the Keymap
+char keys[ROWS][COLS] = {
+  {'1','2','3'},
+  {'4','5','6'},
+  {'7','8','9'},
+  {'#','0','*'}
+};
+// Connect keypad ROW0, ROW1, ROW2 and ROW3 to these Arduino pins.
+byte rowPins[ROWS] = { 9, 8, 7, 6 };
+// Connect keypad COL0, COL1 and COL2 to these Arduino pins.
+byte colPins[COLS] = { 12, 11, 10 }; 
+
+// Create the Keypad
+Keypad kpd = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
+
+#define ledpin 13
+
+void setup()
+{
+  pinMode(ledpin,OUTPUT);
+  digitalWrite(ledpin, HIGH);
+  Serial.begin(9600);
+}
+
+void loop()
+{
+  char key = kpd.getKey();
+  if(key)  // Check for a valid key.
+  {
+    switch (key)
+    {
+      case '*':
+        digitalWrite(ledpin, LOW);
+        break;
+      case '#':
+        digitalWrite(ledpin, HIGH);
+        break;
+      default:
+        Serial.println(key);
+    }
+  }
+}