Merge pull request #1328 from DinoMesina/development

Some corrections and new features

Marlin/Configuration.h

@@ -148,6 +148,7 @@
 #ifdef PIDTEMP
   //#define PID_DEBUG // Sends debug data to the serial port.
   //#define PID_OPENLOOP 1 // Puts PID in open loop. M104/M140 sets the output power from 0 to PID_MAX
+  //#define SLOW_PWM_HEATERS // PWM with very low frequency (circa 0.125Hz=8s) and miminum state time of circa 1s usefoul for heater drived by relay
   #define PID_FUNCTIONAL_RANGE 10 // If the temperature difference between the target temperature and the actual temperature
                                   // is more then PID_FUNCTIONAL_RANGE then the PID will be shut off and the heater will be set to min/max.
   #define PID_INTEGRAL_DRIVE_MAX PID_MAX  //limit for the integral term
@@ -564,7 +565,7 @@ const bool Z_MAX_ENDSTOP_INVERTING = true; // set to true to invert the logic of
 
 // The Elefu RA Board Control Panel
 // http://www.elefu.com/index.php?route=product/product&product_id=53
-// REMEMBER TO INSTALL LiquidCrystal_I2C.h in your ARUDINO library folder: https://github.com/kiyoshigawa/LiquidCrystal_I2C
+// REMEMBER TO INSTALL LiquidCrystal_I2C.h in your ARDUINO library folder: https://github.com/kiyoshigawa/LiquidCrystal_I2C
 //#define RA_CONTROL_PANEL
 
 //automatic expansion

Marlin/example_configurations/SCARA/Configuration.h

@@ -571,7 +571,7 @@ const bool Z_MAX_ENDSTOP_INVERTING = true; // set to true to invert the logic of
 
 // The Elefu RA Board Control Panel
 // http://www.elefu.com/index.php?route=product/product&product_id=53
-// REMEMBER TO INSTALL LiquidCrystal_I2C.h in your ARUDINO library folder: https://github.com/kiyoshigawa/LiquidCrystal_I2C
+// REMEMBER TO INSTALL LiquidCrystal_I2C.h in your ARDUINO library folder: https://github.com/kiyoshigawa/LiquidCrystal_I2C
 //#define RA_CONTROL_PANEL
 
 //automatic expansion

Marlin/example_configurations/delta/Configuration.h

@@ -475,7 +475,7 @@ const bool Z_MAX_ENDSTOP_INVERTING = true; // set to true to invert the logic of
 
 // The Elefu RA Board Control Panel
 // http://www.elefu.com/index.php?route=product/product&product_id=53
-// REMEMBER TO INSTALL LiquidCrystal_I2C.h in your ARUDINO library folder: https://github.com/kiyoshigawa/LiquidCrystal_I2C
+// REMEMBER TO INSTALL LiquidCrystal_I2C.h in your ARDUINO library folder: https://github.com/kiyoshigawa/LiquidCrystal_I2C
 //#define RA_CONTROL_PANEL
 
 // Delta calibration menu

Marlin/example_configurations/makibox/Configuration.h

@@ -543,7 +543,7 @@ const bool Z_MAX_ENDSTOP_INVERTING = true; // set to true to invert the logic of
 
 // The Elefu RA Board Control Panel
 // http://www.elefu.com/index.php?route=product/product&product_id=53
-// REMEMBER TO INSTALL LiquidCrystal_I2C.h in your ARUDINO library folder: https://github.com/kiyoshigawa/LiquidCrystal_I2C
+// REMEMBER TO INSTALL LiquidCrystal_I2C.h in your ARDUINO library folder: https://github.com/kiyoshigawa/LiquidCrystal_I2C
 //#define RA_CONTROL_PANEL
 
 //automatic expansion

Marlin/example_configurations/tvrrug/Round2/Configuration.h

@@ -557,7 +557,7 @@ const bool Z_MAX_ENDSTOP_INVERTING = true; // set to true to invert the logic of
 
 // The Elefu RA Board Control Panel
 // http://www.elefu.com/index.php?route=product/product&product_id=53
-// REMEMBER TO INSTALL LiquidCrystal_I2C.h in your ARUDINO library folder: https://github.com/kiyoshigawa/LiquidCrystal_I2C
+// REMEMBER TO INSTALL LiquidCrystal_I2C.h in your ARDUINO library folder: https://github.com/kiyoshigawa/LiquidCrystal_I2C
 //#define RA_CONTROL_PANEL
 
 //automatic expansion

Marlin/language_it.h

@@ -15,37 +15,37 @@
 #define MSG_AUTOSTART                       "Autostart"
 #define MSG_DISABLE_STEPPERS                "Disabilita Motori"
 #define MSG_AUTO_HOME                       "Auto Home"
-#define MSG_SET_HOME_OFFSETS                "Set home offsets"
+#define MSG_SET_HOME_OFFSETS                "Setta offset home"
 #define MSG_SET_ORIGIN                      "Imposta Origine"
 #define MSG_PREHEAT_PLA                     "Preriscalda PLA"
 #define MSG_PREHEAT_PLA0                    "Preriscalda PLA 1"
 #define MSG_PREHEAT_PLA1                    "Preriscalda PLA 2"
 #define MSG_PREHEAT_PLA2                    "Preriscalda PLA 3"
-#define MSG_PREHEAT_PLA012                  "Preris. PLA Tutto"
-#define MSG_PREHEAT_PLA_BEDONLY             "Preri. PLA Piatto"
-#define MSG_PREHEAT_PLA_SETTINGS            "Preris. PLA Conf"
+#define MSG_PREHEAT_PLA012                  "Prer. PLA Tutto"
+#define MSG_PREHEAT_PLA_BEDONLY             "Prer. PLA Piatto"
+#define MSG_PREHEAT_PLA_SETTINGS            "Config. prer. PLA"
 #define MSG_PREHEAT_ABS                     "Preriscalda ABS"
 #define MSG_PREHEAT_ABS0                    "Preriscalda ABS 1"
 #define MSG_PREHEAT_ABS1                    "Preriscalda ABS 2"
 #define MSG_PREHEAT_ABS2                    "Preriscalda ABS 3"
-#define MSG_PREHEAT_ABS012                  "Preris. ABS Tutto"
-#define MSG_PREHEAT_ABS_BEDONLY             "Preri. ABS Piatto"
-#define MSG_PREHEAT_ABS_SETTINGS            "Preris. ABS Conf"
+#define MSG_PREHEAT_ABS012                  "Prer. ABS Tutto"
+#define MSG_PREHEAT_ABS_BEDONLY             "Prer. ABS Piatto"
+#define MSG_PREHEAT_ABS_SETTINGS            "Config. prer. ABS"
 #define MSG_COOLDOWN                        "Raffredda"
-#define MSG_SWITCH_PS_ON                    "Switch Power On"
-#define MSG_SWITCH_PS_OFF                   "Switch Power Off"
+#define MSG_SWITCH_PS_ON                    "Accendi aliment."
+#define MSG_SWITCH_PS_OFF                   "Spegni aliment."
 #define MSG_EXTRUDE                         "Estrudi"
 #define MSG_RETRACT                         "Ritrai"
 #define MSG_MOVE_AXIS                       "Muovi Asse"
-#define MSG_MOVE_X                          "Move X"
-#define MSG_MOVE_Y                          "Move Y"
-#define MSG_MOVE_Z                          "Move Z"
-#define MSG_MOVE_E                          "Extruder"
-#define MSG_MOVE_E1                         "Extruder2"
-#define MSG_MOVE_E2                         "Extruder3"
-#define MSG_MOVE_01MM                       "Move 0.1mm"
-#define MSG_MOVE_1MM                        "Move 1mm"
-#define MSG_MOVE_10MM                       "Move 10mm"
+#define MSG_MOVE_X                          "Muovi X"
+#define MSG_MOVE_Y                          "Muovi Y"
+#define MSG_MOVE_Z                          "Muovi Z"
+#define MSG_MOVE_E                          "Estrusore"
+#define MSG_MOVE_E1                         "Estrusore 2"
+#define MSG_MOVE_E2                         "Estrusore 3"
+#define MSG_MOVE_01MM                       "Muovi di 0.1mm"
+#define MSG_MOVE_1MM                        "Muovi di   1mm"
+#define MSG_MOVE_10MM                       "Muovi di  10mm"
 #define MSG_SPEED                           "Velcità"
 #define MSG_NOZZLE                          "Ugello"
 #define MSG_NOZZLE1                         "Ugello2"
@@ -61,13 +61,13 @@
 #define MSG_MAX                             " \002 Max:"
 #define MSG_FACTOR                          " \002 Fact:"
 #define MSG_AUTOTEMP                        "Autotemp"
-#define MSG_ON                              "On "
-#define MSG_OFF                             "Off"
+#define MSG_ON                              "ON "
+#define MSG_OFF                             "OFF"
 #define MSG_PID_P                           "PID-P"
 #define MSG_PID_I                           "PID-I"
 #define MSG_PID_D                           "PID-D"
 #define MSG_PID_C                           "PID-C"
-#define MSG_ACC                             "Accel"
+#define MSG_ACC                             "Accel."
 #define MSG_VXY_JERK                        "Vxy-jerk"
 #define MSG_VZ_JERK                         "Vz-jerk"
 #define MSG_VE_JERK                         "Ve-jerk"
@@ -87,11 +87,11 @@
 #define MSG_TEMPERATURE                     "Temperatura"
 #define MSG_MOTION                          "Movimento"
 #define MSG_VOLUMETRIC                      "Filament"
-#define MSG_VOLUMETRIC_ENABLED		        "E in mm3"
-#define MSG_FILAMENT_SIZE_EXTRUDER_0        "Fil. Dia. 1"
-#define MSG_FILAMENT_SIZE_EXTRUDER_1        "Fil. Dia. 2"
-#define MSG_FILAMENT_SIZE_EXTRUDER_2        "Fil. Dia. 3"
-#define MSG_CONTRAST                        "LCD contrast"
+#define MSG_VOLUMETRIC_ENABLED		        "E in mm³"
+#define MSG_FILAMENT_SIZE_EXTRUDER_0        "Diam. filo 1"
+#define MSG_FILAMENT_SIZE_EXTRUDER_1        "Diam. filo 2"
+#define MSG_FILAMENT_SIZE_EXTRUDER_2        "Diam. filo 3"
+#define MSG_CONTRAST                        "Contrasto LCD"
 #define MSG_STORE_EPROM                     "Salva in EEPROM"
 #define MSG_LOAD_EPROM                      "Carica da EEPROM"
 #define MSG_RESTORE_FAILSAFE                "Impostaz. default"
@@ -100,17 +100,17 @@
 #define MSG_PREPARE                         "Prepara"
 #define MSG_TUNE                            "Adatta"
 #define MSG_PAUSE_PRINT                     "Pausa"
-#define MSG_RESUME_PRINT                    "Riprendi Stampa"
-#define MSG_STOP_PRINT                      "Arresta Stampa"
+#define MSG_RESUME_PRINT                    "Riprendi stampa"
+#define MSG_STOP_PRINT                      "Arresta stampa"
 #define MSG_CARD_MENU                       "SD Card Menu"
 #define MSG_NO_CARD                         "No SD Card"
 #define MSG_DWELL                           "Sospensione..."
 #define MSG_USERWAIT                        "Attendi Utente..."
 #define MSG_RESUMING                        "Riprendi Stampa"
-#define MSG_PRINT_ABORTED                   "Print aborted"
-#define MSG_NO_MOVE                         "Nessun Movimento."
-#define MSG_KILLED                          "UCCISO. "
-#define MSG_STOPPED                         "ARRESTATO. "
+#define MSG_PRINT_ABORTED                   "Stampa abortita"
+#define MSG_NO_MOVE                         "Nessun Movimento"
+#define MSG_KILLED                          "UCCISO "
+#define MSG_STOPPED                         "ARRESTATO "
 #define MSG_CONTROL_RETRACT                 "Ritrai mm"
 #define MSG_CONTROL_RETRACT_SWAP            "Scamb. Ritrai mm"
 #define MSG_CONTROL_RETRACTF                "Ritrai  V"
@@ -128,16 +128,16 @@
 #define MSG_BABYSTEP_X                      "Babystep X"
 #define MSG_BABYSTEP_Y                      "Babystep Y"
 #define MSG_BABYSTEP_Z                      "Babystep Z"
-#define MSG_ENDSTOP_ABORT                   "Endstop abort"
+#define MSG_ENDSTOP_ABORT                   "Finecorsa abort"
 
 #define MSG_RECTRACT                        "Ritrai"
 
 #ifdef DELTA_CALIBRATION_MENU
-    #define MSG_DELTA_CALIBRATE             "Delta Calibration"
-    #define MSG_DELTA_CALIBRATE_X           "Calibrate X"
-    #define MSG_DELTA_CALIBRATE_Y           "Calibrate Y"
-    #define MSG_DELTA_CALIBRATE_Z           "Calibrate Z"
-    #define MSG_DELTA_CALIBRATE_CENTER      "Calibrate Center"
+    #define MSG_DELTA_CALIBRATE             "Calibraz. Delta"
+    #define MSG_DELTA_CALIBRATE_X           "Calibra X"
+    #define MSG_DELTA_CALIBRATE_Y           "Calibra Y"
+    #define MSG_DELTA_CALIBRATE_Z           "Calibra Z"
+    #define MSG_DELTA_CALIBRATE_CENTER      "Calibra Center"
 #endif // DELTA_CALIBRATION_MENU
 
 #endif // LANGUAGE_IT_H

Marlin/temperature.cpp

@@ -497,7 +497,7 @@ void manage_heater()
     SERIAL_ECHO(" iTerm ");
     SERIAL_ECHO(iTerm[e]);
     SERIAL_ECHO(" dTerm ");
-    SERIAL_ECHOLN(dTerm[e]);  
+    SERIAL_ECHOLN(dTerm[e]);
     #endif //PID_DEBUG
   #else /* PID off */
     pid_output = 0;
@@ -1221,68 +1221,311 @@ ISR(TIMER0_COMPB_vect)
   static unsigned char temp_state = 10;
   static unsigned char pwm_count = (1 << SOFT_PWM_SCALE);
   static unsigned char soft_pwm_0;
-  #if (EXTRUDERS > 1) || defined(HEATERS_PARALLEL)
+#ifdef SLOW_PWM_HEATERS
+  static unsigned char slow_pwm_count = 0;
+  static unsigned char state_heater_0 = 0;
+  static unsigned char state_timer_heater_0 = 0;
+#endif 
+#if (EXTRUDERS > 1) || defined(HEATERS_PARALLEL)
   static unsigned char soft_pwm_1;
-  #endif
-  #if EXTRUDERS > 2
+#ifdef SLOW_PWM_HEATERS
+  static unsigned char state_heater_1 = 0;
+  static unsigned char state_timer_heater_1 = 0;
+#endif 
+#endif
+#if EXTRUDERS > 2
   static unsigned char soft_pwm_2;
-  #endif
-  #if HEATER_BED_PIN > -1
+#ifdef SLOW_PWM_HEATERS
+  static unsigned char state_heater_2 = 0;
+  static unsigned char state_timer_heater_2 = 0;
+#endif 
+#endif
+#if HEATER_BED_PIN > -1
   static unsigned char soft_pwm_b;
-  #endif
+#ifdef SLOW_PWM_HEATERS
+  static unsigned char state_heater_b = 0;
+  static unsigned char state_timer_heater_b = 0;
+#endif 
+#endif
   
-  #if defined(FILWIDTH_PIN) &&(FILWIDTH_PIN > -1)
-   static unsigned long raw_filwidth_value = 0;  //added for filament width sensor
-  #endif
+#if defined(FILWIDTH_PIN) &&(FILWIDTH_PIN > -1)
+  static unsigned long raw_filwidth_value = 0;  //added for filament width sensor
+#endif
   
+#ifndef SLOW_PWM_HEATERS
+  /*
+   * standard PWM modulation
+   */
   if(pwm_count == 0){
     soft_pwm_0 = soft_pwm[0];
     if(soft_pwm_0 > 0) { 
       WRITE(HEATER_0_PIN,1);
-      #ifdef HEATERS_PARALLEL
+#ifdef HEATERS_PARALLEL
       WRITE(HEATER_1_PIN,1);
-      #endif
+#endif
     } else WRITE(HEATER_0_PIN,0);
-	
-    #if EXTRUDERS > 1
+    
+#if EXTRUDERS > 1
     soft_pwm_1 = soft_pwm[1];
     if(soft_pwm_1 > 0) WRITE(HEATER_1_PIN,1); else WRITE(HEATER_1_PIN,0);
-    #endif
-    #if EXTRUDERS > 2
+#endif
+#if EXTRUDERS > 2
     soft_pwm_2 = soft_pwm[2];
     if(soft_pwm_2 > 0) WRITE(HEATER_2_PIN,1); else WRITE(HEATER_2_PIN,0);
-    #endif
-    #if defined(HEATER_BED_PIN) && HEATER_BED_PIN > -1
+#endif
+#if defined(HEATER_BED_PIN) && HEATER_BED_PIN > -1
     soft_pwm_b = soft_pwm_bed;
     if(soft_pwm_b > 0) WRITE(HEATER_BED_PIN,1); else WRITE(HEATER_BED_PIN,0);
-    #endif
-    #ifdef FAN_SOFT_PWM
+#endif
+#ifdef FAN_SOFT_PWM
     soft_pwm_fan = fanSpeedSoftPwm / 2;
     if(soft_pwm_fan > 0) WRITE(FAN_PIN,1); else WRITE(FAN_PIN,0);
-    #endif
+#endif
   }
   if(soft_pwm_0 < pwm_count) { 
-      WRITE(HEATER_0_PIN,0);
-      #ifdef HEATERS_PARALLEL
-      WRITE(HEATER_1_PIN,0);
-      #endif
-    }
-  #if EXTRUDERS > 1
+    WRITE(HEATER_0_PIN,0);
+#ifdef HEATERS_PARALLEL
+    WRITE(HEATER_1_PIN,0);
+#endif
+  }
+#if EXTRUDERS > 1
   if(soft_pwm_1 < pwm_count) WRITE(HEATER_1_PIN,0);
-  #endif
-  #if EXTRUDERS > 2
+#endif
+#if EXTRUDERS > 2
   if(soft_pwm_2 < pwm_count) WRITE(HEATER_2_PIN,0);
-  #endif
-  #if defined(HEATER_BED_PIN) && HEATER_BED_PIN > -1
+#endif
+#if defined(HEATER_BED_PIN) && HEATER_BED_PIN > -1
   if(soft_pwm_b < pwm_count) WRITE(HEATER_BED_PIN,0);
-  #endif
-  #ifdef FAN_SOFT_PWM
+#endif
+#ifdef FAN_SOFT_PWM
   if(soft_pwm_fan < pwm_count) WRITE(FAN_PIN,0);
-  #endif
+#endif
+  
+  pwm_count += (1 << SOFT_PWM_SCALE);
+  pwm_count &= 0x7f;
+  
+#else //ifndef SLOW_PWM_HEATERS
+  /*
+   * SLOW PWM HEATERS
+   *
+   * for heaters drived by relay
+   */
+#ifndef MIN_STATE_TIME
+#define MIN_STATE_TIME 16 // MIN_STATE_TIME * 65.5 = time in milliseconds
+#endif
+  if (slow_pwm_count == 0) {
+    // EXTRUDER 0 
+    soft_pwm_0 = soft_pwm[0];
+    if (soft_pwm_0 > 0) {
+      // turn ON heather only if the minimum time is up 
+      if (state_timer_heater_0 == 0) { 
+	// if change state set timer 
+	if (state_heater_0 == 0) {
+	  state_timer_heater_0 = MIN_STATE_TIME;
+	}
+	state_heater_0 = 1;
+	WRITE(HEATER_0_PIN, 1);
+#ifdef HEATERS_PARALLEL
+	WRITE(HEATER_1_PIN, 1);
+#endif
+      }
+    } else {
+      // turn OFF heather only if the minimum time is up 
+      if (state_timer_heater_0 == 0) {
+	// if change state set timer 
+	if (state_heater_0 == 1) {
+	  state_timer_heater_0 = MIN_STATE_TIME;
+	}
+	state_heater_0 = 0;
+	WRITE(HEATER_0_PIN, 0);
+#ifdef HEATERS_PARALLEL
+	WRITE(HEATER_1_PIN, 0);
+#endif
+      }
+    }
+    
+#if EXTRUDERS > 1
+    // EXTRUDER 1
+    soft_pwm_1 = soft_pwm[1];
+    if (soft_pwm_1 > 0) {
+      // turn ON heather only if the minimum time is up 
+      if (state_timer_heater_1 == 0) { 
+	// if change state set timer 
+	if (state_heater_1 == 0) {
+	  state_timer_heater_1 = MIN_STATE_TIME;
+	}
+	state_heater_1 = 1;
+	WRITE(HEATER_1_PIN, 1);
+      }
+    } else {
+      // turn OFF heather only if the minimum time is up 
+      if (state_timer_heater_1 == 0) {
+	// if change state set timer 
+	if (state_heater_1 == 1) {
+	  state_timer_heater_1 = MIN_STATE_TIME;
+	}
+	state_heater_1 = 0;
+	WRITE(HEATER_1_PIN, 0);
+      }
+    }
+#endif
+    
+#if EXTRUDERS > 2
+    // EXTRUDER 2
+    soft_pwm_2 = soft_pwm[2];
+    if (soft_pwm_2 > 0) {
+      // turn ON heather only if the minimum time is up 
+      if (state_timer_heater_2 == 0) { 
+	// if change state set timer 
+	if (state_heater_2 == 0) {
+	  state_timer_heater_2 = MIN_STATE_TIME;
+	}
+	state_heater_2 = 1;
+	WRITE(HEATER_2_PIN, 1);
+      }
+    } else {
+      // turn OFF heather only if the minimum time is up 
+      if (state_timer_heater_2 == 0) {
+	// if change state set timer 
+	if (state_heater_2 == 1) {
+	  state_timer_heater_2 = MIN_STATE_TIME;
+	}
+	state_heater_2 = 0;
+	WRITE(HEATER_2_PIN, 0);
+      }
+    }
+#endif
+    
+#if defined(HEATER_BED_PIN) && HEATER_BED_PIN > -1
+    // BED
+    soft_pwm_b = soft_pwm_bed;
+    if (soft_pwm_b > 0) {
+      // turn ON heather only if the minimum time is up 
+      if (state_timer_heater_b == 0) { 
+	// if change state set timer 
+	if (state_heater_b == 0) {
+	  state_timer_heater_b = MIN_STATE_TIME;
+	}
+	state_heater_b = 1;
+	WRITE(HEATER_BED_PIN, 1);
+      }
+    } else {
+      // turn OFF heather only if the minimum time is up 
+      if (state_timer_heater_b == 0) {
+	// if change state set timer 
+	if (state_heater_b == 1) {
+	  state_timer_heater_b = MIN_STATE_TIME;
+	}
+	state_heater_b = 0;
+	WRITE(HEATER_BED_PIN, 0);
+      }
+    }
+#endif
+  } // if (slow_pwm_count == 0)
+  
+  // EXTRUDER 0 
+  if (soft_pwm_0 < slow_pwm_count) {
+    // turn OFF heather only if the minimum time is up 
+    if (state_timer_heater_0 == 0) { 
+      // if change state set timer 
+      if (state_heater_0 == 1) {
+	state_timer_heater_0 = MIN_STATE_TIME;
+      }
+      state_heater_0 = 0;
+      WRITE(HEATER_0_PIN, 0);
+#ifdef HEATERS_PARALLEL
+      WRITE(HEATER_1_PIN, 0);
+#endif
+    }
+  }
+    
+#if EXTRUDERS > 1
+  // EXTRUDER 1 
+  if (soft_pwm_1 < slow_pwm_count) {
+    // turn OFF heather only if the minimum time is up 
+    if (state_timer_heater_1 == 0) { 
+      // if change state set timer 
+      if (state_heater_1 == 1) {
+	state_timer_heater_1 = MIN_STATE_TIME;
+      }
+      state_heater_1 = 0;
+      WRITE(HEATER_1_PIN, 0);
+    }
+  }
+#endif
+  
+#if EXTRUDERS > 2
+  // EXTRUDER 2
+  if (soft_pwm_2 < slow_pwm_count) {
+    // turn OFF heather only if the minimum time is up 
+    if (state_timer_heater_2 == 0) { 
+      // if change state set timer 
+      if (state_heater_2 == 1) {
+	state_timer_heater_2 = MIN_STATE_TIME;
+      }
+      state_heater_2 = 0;
+      WRITE(HEATER_2_PIN, 0);
+    }
+  }
+#endif
+  
+#if defined(HEATER_BED_PIN) && HEATER_BED_PIN > -1
+  // BED
+  if (soft_pwm_b < slow_pwm_count) {
+    // turn OFF heather only if the minimum time is up 
+    if (state_timer_heater_b == 0) { 
+      // if change state set timer 
+      if (state_heater_b == 1) {
+	state_timer_heater_b = MIN_STATE_TIME;
+      }
+      state_heater_b = 0;
+      WRITE(HEATER_BED_PIN, 0);
+    }
+  }
+#endif
+  
+#ifdef FAN_SOFT_PWM
+  if (pwm_count == 0){
+    soft_pwm_fan = fanSpeedSoftPwm / 2;
+    if (soft_pwm_fan > 0) WRITE(FAN_PIN,1); else WRITE(FAN_PIN,0);
+  }
+  if (soft_pwm_fan < pwm_count) WRITE(FAN_PIN,0);
+#endif
   
   pwm_count += (1 << SOFT_PWM_SCALE);
   pwm_count &= 0x7f;
   
+  // increment slow_pwm_count only every 64 pwm_count circa 65.5ms
+  if ((pwm_count % 64) == 0) {
+    slow_pwm_count++;
+    slow_pwm_count &= 0x7f;
+    
+    // Extruder 0
+    if (state_timer_heater_0 > 0) {
+      state_timer_heater_0--;
+    } 
+  
+#if EXTRUDERS > 1
+    // Extruder 1
+    if (state_timer_heater_1 > 0) 
+      state_timer_heater_1--;
+#endif
+    
+#if EXTRUDERS > 2
+    // Extruder 2
+    if (state_timer_heater_2 > 0) 
+      state_timer_heater_2--;
+#endif
+    
+#if defined(HEATER_BED_PIN) && HEATER_BED_PIN > -1
+    // Bed   
+    if (state_timer_heater_b > 0) 
+      state_timer_heater_b--;
+#endif
+  } //if ((pwm_count % 64) == 0) {
+  
+#endif //ifndef SLOW_PWM_HEATERS
+  
   switch(temp_state) {
     case 0: // Prepare TEMP_0
       #if defined(TEMP_0_PIN) && (TEMP_0_PIN > -1)