Merge remote-tracking branch 'origin/Marlin_v1' into Marlin_v1

Marlin/Configuration.h

 
 //automatic temperature: just for testing, this is very dangerous, keep disabled!
 // not working yet.
-//Erik: the settings currently depend dramatically on skeinforge39 or 41.
 //#define AUTOTEMP
-#define AUTOTEMP_MIN 190
-#define AUTOTEMP_MAX 260
-#define AUTOTEMP_FACTOR 1000.  //current target temperature= min+largest buffered espeeds)*FACTOR
+#ifdef AUTOTEMP
+  #define AUTOTEMP_OLDWEIGHT 0.98
+#endif
 
 
 const int dropsegments=5; //everything with less than this number of steps will be ignored as move and joined with the next movement

Marlin/Marlin.pde

       break;
     case 109: 
     {// M109 - Wait for extruder heater to reach target.
-        LCD_MESSAGEPGM("Heating...");
-        autotemp_enabled=false;
+        LCD_MESSAGEPGM("Heating...");   
+        #ifdef AUTOTEMP
+          autotemp_enabled=false;
+        #endif
         if (code_seen('S')) setTargetHotend0(code_value());
         #ifdef AUTOTEMP
           if (code_seen('S')) autotemp_min=code_value();

Marlin/planner.cpp

 #ifdef AUTOTEMP
 void getHighESpeed()
 {
+  static float oldt=0;
   if(!autotemp_enabled)
     return;
   if(degTargetHotend0()+2<autotemp_min)  //probably temperature set to zero.
   }
    
   float g=autotemp_min+high*autotemp_factor;
-  float t=constrain(autotemp_min,g,autotemp_max);
+  float t=g;
+  if(t<autotemp_min)
+    t=autotemp_min;
+  if(t>autotemp_max)
+    t=autotemp_max;
+  if(oldt>t)
+  {
+    t=AUTOTEMP_OLDWEIGHT*oldt+(1-AUTOTEMP_OLDWEIGHT)*t;
+  }
+  oldt=t;
   setTargetHotend0(t);
-  SERIAL_ECHO_START;
-  SERIAL_ECHOPAIR("highe",high);
-  SERIAL_ECHOPAIR(" t",t);
-  SERIAL_ECHOLN("");
+//   SERIAL_ECHO_START;
+//   SERIAL_ECHOPAIR("highe",high);
+//   SERIAL_ECHOPAIR(" t",t);
+//   SERIAL_ECHOLN("");
 }
 #endif