diff --git a/Tree/Tree.ino b/Tree/Tree.ino
new file mode 100644
index 0000000..605ccb6
--- /dev/null
+++ b/Tree/Tree.ino
@@ -0,0 +1,38 @@
+/*
+  Rick van Lieshout 
+  24-12-2015
+  LICENSE: MIT
+*/
+
+const int DELAYTIME = 100;
+const int NUMBEROFPINS = 11; 
+const int pinArray[NUMBEROFPINS] = {0,1,2,3,4,5,6,7,8,9,10};
+
+void setup() {
+  //initiate pins
+  for (int thisPin = 0; thisPin < NUMBEROFPINS; thisPin++) {
+    pinMode(pinArray[thisPin], OUTPUT);
+  }
+}
+
+void loop() {
+  // loop from the lowest pin to the highest:
+  for (int thisPin = 0; thisPin < NUMBEROFPINS; thisPin++) {
+    // turn the led on:
+    digitalWrite(pinArray[thisPin], HIGH);
+    // wait for a bit
+    delay(DELAYTIME);
+    // turn the led off:
+    digitalWrite(pinArray[thisPin], LOW);
+
+  }
+  // loop from the highest pin to the lowest:
+  for (int thisPin = NUMBEROFPINS - 1; thisPin >= 0; thisPin--) {
+    // turn the led on:
+    digitalWrite(pinArray[thisPin], HIGH);
+    // wait for a bit
+    delay(DELAYTIME);
+    // turn the led off:
+    digitalWrite(pinArray[thisPin], LOW);
+  }
+}