diff --git a/arduino_scripts/Test-Arduino-Timetable/Test-Arduino-Timetable.ino b/arduino_scripts/Test-Arduino-Timetable/Test-Arduino-Timetable.ino
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+++ b/arduino_scripts/Test-Arduino-Timetable/Test-Arduino-Timetable.ino
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+/*
+  Reading a serial ASCII-encoded string.
+
+ This sketch demonstrates the Serial parseInt() function.
+ It looks for an ASCII string of comma-separated values.
+ It parses them into ints, and uses those to fade an RGB LED.
+
+ Circuit: Common-Cathode RGB LED wired like so:
+ * Red anode: digital pin 3
+ * Green anode: digital pin 5
+ * Blue anode: digital pin 6
+ * Cathode : GND
+
+ created 13 Apr 2012
+ by Tom Igoe
+ 
+ modified 14 Mar 2016
+ by Arturo Guadalupi
+
+ This example code is in the public domain.
+ */
+
+
+void setup() {
+  // initialize serial:
+  Serial.begin(9600);
+  // make the pins outputs:
+  pinMode(LED_BUILTIN, OUTPUT);
+  digitalWrite(LED_BUILTIN, LOW);
+}
+
+void loop() {
+    char inByte = Serial.read(); // read the incoming data
+    if (inByte=='o'){
+      digitalWrite(LED_BUILTIN, LOW);
+    } else if (inByte=='c'){
+      digitalWrite(LED_BUILTIN, HIGH);
+    }
+  
+}
+