diff --git a/README.MD b/README.MD
new file mode 100644
index 0000000..5170b2e
--- /dev/null
+++ b/README.MD
@@ -0,0 +1,16 @@
+## Kabelbelegung 3D Drucker RFID: ##
+
+Steckerpin Farbe Beschreibung (Pin am LCD/Adrino)
+1,2 Rot, Orange: +5V (5V)
+3 Grau (unused)
+4 Weiss (pin A0)
+5 Rosa (pin 10)
+6 Braunweiss (oder Baby Blau bei Display seite)  (pin 8)
+7 Braun (pin 7)
+8 Lila (pin 5)
+9 Blau (pin 4)
+10 Gruen (pin 6)
+11 Gelb (pin 9)
+12 Türkis (unused)
+13,14 Schwarz, Schwarzweiss: GND (GND)
+
diff --git a/T11_RFID_Tutorial_Sketch/T11_RFID_Tutorial_Sketch.ino b/T11_RFID_Tutorial_Sketch/T11_RFID_Tutorial_Sketch.ino
index 76210f8..939d962 100644
--- a/T11_RFID_Tutorial_Sketch/T11_RFID_Tutorial_Sketch.ino
+++ b/T11_RFID_Tutorial_Sketch/T11_RFID_Tutorial_Sketch.ino
@@ -1,8 +1,15 @@
+//#define PRINTER //uncomment for 3d-Printer (cooldown functions)
+
 #include <SPI.h>
 #include <LiquidCrystal.h>
 #include <EEPROM.h>
 #include <MFRC522.h>
 
+#ifdef PRINTER
+  #define BTN_FANPROBE                 A3
+  #define FANOFFVALUE                  50 //adc value for fan
+  boolean flag_switchOff = false; //set true-> loop switches output off if possible
+#endif
 
 #define BTN_PIN                 A0      // lcd buttons are Voltage-Divider analog
 #define LCD_BACKLIGHT           10
@@ -40,6 +47,7 @@ int displayCardsIndex = -1;
 int displayCardsIndexLast = -1;
 boolean cardsshow=false;
 
+
 void setup() {
   pinMode(10, OUTPUT);  // LCD backlight
   pinMode(A4, OUTPUT);  // relais 1
@@ -159,8 +167,20 @@ void handleCards(long currentMillis) {
       } else {
         // if we are locked, we switch out Output
         
-        if(outputOn) {          
-          set_output(false);
+        if(outputOn) {
+          #ifdef PRINTER
+            if (!flag_switchOff){
+              flag_switchOff=true;
+              lcd.clear();
+              lcd.print("Wartet auf");
+              lcd.setCursor(0, 1);
+              lcd.print("Luefter");
+            }else{
+              flag_switchOff=false; //cancel switchoff
+            }
+          #else
+            set_output(false);
+          #endif
         } else {
           add_log(&(mfrc522.uid));
           set_output(true);
@@ -214,6 +234,7 @@ void loop() {
 
   handleCards(currentMillis);
 
+
   if(readButtons() == 1 && !cardsshow) { //select button shows log, if not showing cards atm
     displayLogIndex++;
     displayLogIndex %= 10;
@@ -295,6 +316,40 @@ void loop() {
       lcd_print_home();
     }
   }
+
+  #ifdef PRINTER
+    int fanvalue=analogRead(BTN_FANPROBE);
+    Serial.println(fanvalue);
+    if (flag_switchOff){
+      if (readButtons()!=0){ //any buttons pressed
+        abortSwitchoff();
+      }
+      if (!fanActive()){
+        set_output(false);
+        flag_switchOff=false;
+      }
+    }
+  #endif
 }
 
+#ifdef PRINTER
+bool fanActive()
+{
+  int fanvalue=analogRead(BTN_FANPROBE);
+  Serial.println(fanvalue);
+  if (fanvalue<FANOFFVALUE){
+    return false;
+  }else{
+    return true;
+  }
+}
+
+void abortSwitchoff(){
+  flag_switchOff=false;
+  lcd.clear();
+  lcd.print("Ausschalten");
+  lcd.setCursor(0, 1);
+  lcd.print("Abgebrochen");
+}
+#endif