diff --git a/Sketches/sketch_dec13a-LEDSequence/.vscode/arduino.json b/Sketches/sketch_dec13a-LEDSequence/.vscode/arduino.json
new file mode 100644
index 0000000..9fb1d0e
--- /dev/null
+++ b/Sketches/sketch_dec13a-LEDSequence/.vscode/arduino.json
@@ -0,0 +1,6 @@
+{
+    "programmer": "Atmel-ICE (AVR)",
+    "board": "arduino:avr:uno",
+    "port": "COM6",
+    "sketch": "sketch_dec13a-LEDSequence.ino"
+}
\ No newline at end of file
diff --git a/Sketches/sketch_dec13a-LEDSequence/.vscode/c_cpp_properties.json b/Sketches/sketch_dec13a-LEDSequence/.vscode/c_cpp_properties.json
new file mode 100644
index 0000000..b372c2b
--- /dev/null
+++ b/Sketches/sketch_dec13a-LEDSequence/.vscode/c_cpp_properties.json
@@ -0,0 +1,19 @@
+{
+    "configurations": [
+        {
+            "name": "Win32",
+            "includePath": [
+                "C:\\Program Files (x86)\\Arduino\\tools\\**",
+                "C:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\**"
+            ],
+            "forcedInclude": [
+                "C:\\Program Files (x86)\\Arduino\\hardware\\arduino\\avr\\cores\\arduino\\Arduino.h"
+            ],
+            "intelliSenseMode": "msvc-x64",
+            "compilerPath": "C:/Program Files (x86)/Microsoft Visual Studio/2017/BuildTools/VC/Tools/MSVC/14.16.27023/bin/Hostx64/x64/cl.exe",
+            "cStandard": "c11",
+            "cppStandard": "c++17"
+        }
+    ],
+    "version": 4
+}
\ No newline at end of file
diff --git a/Sketches/sketch_dec13a-LEDSequence/sketch_dec13a-LEDSequence.ino b/Sketches/sketch_dec13a-LEDSequence/sketch_dec13a-LEDSequence.ino
new file mode 100644
index 0000000..2a260c2
--- /dev/null
+++ b/Sketches/sketch_dec13a-LEDSequence/sketch_dec13a-LEDSequence.ino
@@ -0,0 +1,95 @@
+/**
+ * Pins som LED er koblet til.
+ * Pins som har variabel med navn _EXT blir brukt som ekstra-LED når det er
+ * totalt 8 LEDs.
+ */
+int LED_GRN = 8;
+int LED_GRN_EXT = 2;
+int LED_RED = 9;
+int LED_RED_EXT = 3;
+int LED_BLU = 10;
+int LED_BLU_EXT = 4;
+int LED_YEL = 11;
+int LED_YEL_EXT = 5;
+
+/**
+ *
+ */
+int outputPins[] = {
+    LED_GRN,
+    LED_RED,
+    LED_BLU,
+    LED_YEL
+};
+
+/**
+ * Array for 8 LEDs
+ */
+// int outputPins[] = {LED_GRN, LED_RED, LED_BLU, LED_YEL, LED_GRN_EXT, LED_RED_EXT, LED_BLU_EXT, LED_YEL_EXT};
+int outputCount = sizeof(outputPins) / sizeof(int);
+
+void setup()
+{
+    /**
+     * Sett LED pins til output
+     */
+    for(int i = 0; i < (outputCount); i++)
+    {
+        pinMode(outputPins[i], OUTPUT);
+    }
+
+    // Debugging.
+    Serial.begin(9600);
+}
+/**
+ * Max nummer før den resetter og starter på nytt.
+ */
+int sequence[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
+
+/**
+ * Dette array-et blir brukt når det er 8 LED :)
+ */
+// int sequence[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175, 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191, 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239, 240, 241, 242, 243, 244, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255};
+
+/**
+ * Max index på sekvens-arrayet.
+ */
+int maxSequence = (sizeof(sequence) / sizeof(int));
+/**
+ * Tracker array index som er relevant i loopen
+ */
+int index = 0;
+void loop()
+{
+    /**
+     * Hent int fra sekvens array basert på index.
+     */
+    int currentNum = sequence[index];
+
+    Serial.println(currentNum);
+
+    /**
+     * Les hvilke bit som er aktive i byte-verdien av int og sett
+     * relevant LED til å lyse basert på verdi av bit.
+     *
+     * Loopen gjør følgende:
+     * - Sjekker `currentNum` som er int'et som er konvertert til byte
+     * - `i` blir brukt som index i outputPins.
+     *   Indexen blir også brukt til å finne det relevante bittet i denne "interasjonen" av loopen
+     * - Slår på LEDen som skal "mappe til" bit'et.
+     */
+    for (int i = 0; i < outputCount; i++) {
+        bool shouldGlow = bitRead(currentNum, i) == 1;
+        digitalWrite(outputPins[i], shouldGlow ? 255 : 0);
+    }
+
+    /**
+     * Inkrement `index` som brukes som index i array: `sequence[]`
+     */
+    index++;
+    if (index > maxSequence) {
+        index = 0;
+    }
+
+    delay(750);
+}