two modes if no humidity sensor available

src/Heating.h

@@ -9,10 +9,13 @@
 
 class Heating {
 public:
-    void init(Temperature* tempsensor);
+    void init(Temperature* tempsensor, unsigned mode);
+
+    enum MODES {TIME, HUMIDITY};
 private:
     Ticker mHeizungTicker;
     Ticker mLuefterTicker;
+    Ticker mTurnOffTicker;
 
     bool mFanWaiting;
 };