Merge pull request #409 from buildrob202/Marlin_v1

Implement automatic cold-end/extruder motor fan control based on nozzle temperature

Marlin/Configuration.h

@@ -51,6 +51,9 @@
 #define MOTHERBOARD 7
 #endif
 
+// This defines the number of extruders
+#define EXTRUDERS 1
+
 //// The following define selects which power supply you have. Please choose the one that matches your setup
 // 1 = ATX
 // 2 = X-Box 360 203Watts (the blue wire connected to PS_ON and the red wire to VCC)

Marlin/Configuration_adv.h

@@ -63,21 +63,31 @@
 //This is for controlling a fan to cool down the stepper drivers
 //it will turn on when any driver is enabled
 //and turn off after the set amount of seconds from last driver being disabled again
-//#define CONTROLLERFAN_PIN 23 //Pin used for the fan to cool controller, comment out to disable this function
+#define CONTROLLERFAN_PIN -1 //Pin used for the fan to cool controller (-1 to disable)
-#define CONTROLLERFAN_SEC 60 //How many seconds, after all motors were disabled, the fan should run
+#define CONTROLLERFAN_SECS 60 //How many seconds, after all motors were disabled, the fan should run
+#define CONTROLLERFAN_SPEED 255  // == full speed
 
 // When first starting the main fan, run it at full speed for the
 // given number of milliseconds.  This gets the fan spinning reliably
 // before setting a PWM value. (Does not work with software PWM for fan on Sanguinololu)
 //#define FAN_KICKSTART_TIME 100
 
+// Extruder cooling fans
+// Configure fan pin outputs to automatically turn on/off when the associated
+// extruder temperature is above/below EXTRUDER_AUTO_FAN_TEMPERATURE.
+// Multiple extruders can be assigned to the same pin in which case 
+// the fan will turn on when any selected extruder is above the threshold.
+#define EXTRUDER_0_AUTO_FAN_PIN   -1
+#define EXTRUDER_1_AUTO_FAN_PIN   -1
+#define EXTRUDER_2_AUTO_FAN_PIN   -1
+#define EXTRUDER_AUTO_FAN_TEMPERATURE 50
+#define EXTRUDER_AUTO_FAN_SPEED   255  // == full speed
+
+
 //===========================================================================
 //=============================Mechanical Settings===========================
 //===========================================================================
 
-// This defines the number of extruders
-#define EXTRUDERS 1
-
 #define ENDSTOPS_ONLY_FOR_HOMING // If defined the endstops will only be used for homing
 
 

Marlin/Marlin_main.cpp

@@ -319,7 +319,7 @@ void setup_photpin()
 void setup_powerhold()
 {
  #ifdef SUICIDE_PIN
-   #if (SUICIDE_PIN> -1)
+   #if (SUICIDE_PIN> 0)
       SET_OUTPUT(SUICIDE_PIN);
       WRITE(SUICIDE_PIN, HIGH);
    #endif
@@ -411,13 +411,9 @@ void setup()
 
   lcd_init();
   
-  #ifdef CONTROLLERFAN_PIN
+  #if CONTROLLERFAN_PIN > 0
     SET_OUTPUT(CONTROLLERFAN_PIN); //Set pin used for driver cooling fan
   #endif 
-
-  #ifdef EXTRUDERFAN_PIN
-    SET_OUTPUT(EXTRUDERFAN_PIN); //Set pin used for extruder cooling fan
-  #endif
 }
 
 
@@ -1040,6 +1036,10 @@ void process_commands()
             break;
           }
         }
+      #if FAN_PIN > 0
+        if (pin_number == FAN_PIN)
+          fanSpeed = pin_status;
+      #endif
         if (pin_number > -1)
         {
           pinMode(pin_number, OUTPUT);
@@ -2064,7 +2064,12 @@ void prepare_arc_move(char isclockwise) {
   previous_millis_cmd = millis();
 }
 
-#ifdef CONTROLLERFAN_PIN
+#if CONTROLLERFAN_PIN > 0
+
+#if CONTROLLERFAN_PIN == FAN_PIN 
+   #error "You cannot set CONTROLLERFAN_PIN equal to FAN_PIN"
+#endif
+
 unsigned long lastMotor = 0; //Save the time for when a motor was turned on last
 unsigned long lastMotorCheck = 0;
 
@@ -2086,34 +2091,16 @@ void controllerFan()
       lastMotor = millis(); //... set time to NOW so the fan will turn on
     }
     
-    if ((millis() - lastMotor) >= (CONTROLLERFAN_SEC*1000UL) || lastMotor == 0) //If the last time any driver was enabled, is longer since than CONTROLLERSEC...
+    if ((millis() - lastMotor) >= (CONTROLLERFAN_SECS*1000UL) || lastMotor == 0) //If the last time any driver was enabled, is longer since than CONTROLLERSEC...   
     {
-      WRITE(CONTROLLERFAN_PIN, LOW); //... turn the fan off
+        digitalWrite(CONTROLLERFAN_PIN, 0); 
+        analogWrite(CONTROLLERFAN_PIN, 0); 
     }
     else
     {
-      WRITE(CONTROLLERFAN_PIN, HIGH); //... turn the fan on
+        // allows digital or PWM fan output to be used (see M42 handling)
-    }
+        digitalWrite(CONTROLLERFAN_PIN, CONTROLLERFAN_SPEED);
-  }
+        analogWrite(CONTROLLERFAN_PIN, CONTROLLERFAN_SPEED); 
-}
-#endif
-
-#ifdef EXTRUDERFAN_PIN
-unsigned long lastExtruderCheck = 0;
-
-void extruderFan()
-{
-  if ((millis() - lastExtruderCheck) >= 2500) //Not a time critical function, so we only check every 2500ms
-  {
-    lastExtruderCheck = millis();
-
-    if (degHotend(active_extruder) < EXTRUDERFAN_DEC)
-    {
-      WRITE(EXTRUDERFAN_PIN, LOW); //... turn the fan off
-    }
-    else
-    {
-      WRITE(EXTRUDERFAN_PIN, HIGH); //... turn the fan on
     }
   }
 }
@@ -2137,11 +2124,11 @@ void manage_inactivity()
       }
     }
   }
-  #if( KILL_PIN>-1 )
+  #if KILL_PIN > 0
     if( 0 == READ(KILL_PIN) )
       kill();
   #endif
-  #ifdef CONTROLLERFAN_PIN
+  #if CONTROLLERFAN_PIN > 0
     controllerFan(); //Check if fan should be turned on to cool stepper drivers down
   #endif
   #ifdef EXTRUDER_RUNOUT_PREVENT

Marlin/stepper.cpp

@@ -879,10 +879,6 @@ void st_init()
     disable_e2();
   #endif  
 
-  #ifdef CONTROLLERFAN_PIN
-    SET_OUTPUT(CONTROLLERFAN_PIN); //Set pin used for driver cooling fan
-  #endif
-  
   // waveform generation = 0100 = CTC
   TCCR1B &= ~(1<<WGM13);
   TCCR1B |=  (1<<WGM12);

Marlin/temperature.cpp

@@ -99,8 +99,9 @@ static volatile bool temp_meas_ready = false;
 #ifdef FAN_SOFT_PWM
   static unsigned char soft_pwm_fan;
 #endif
-
+#if EXTRUDER_0_AUTO_FAN_PIN > 0 || EXTRUDER_1_AUTO_FAN_PIN > 0 || EXTRUDER_2_AUTO_FAN_PIN > 0
-
+  static unsigned long extruder_autofan_last_check;
+#endif  
   
 #if EXTRUDERS > 3
 # error Unsupported number of extruders
@@ -306,6 +307,76 @@ int getHeaterPower(int heater) {
   return soft_pwm[heater];
 }
 
+#if EXTRUDER_0_AUTO_FAN_PIN > 0 || EXTRUDER_1_AUTO_FAN_PIN > 0 || EXTRUDER_2_AUTO_FAN_PIN > 0
+
+  #if FAN_PIN > 0
+    #if EXTRUDER_0_AUTO_FAN_PIN == FAN_PIN 
+       #error "You cannot set EXTRUDER_0_AUTO_FAN_PIN equal to FAN_PIN"
+    #endif
+    #if EXTRUDER_1_AUTO_FAN_PIN == FAN_PIN 
+       #error "You cannot set EXTRUDER_1_AUTO_FAN_PIN equal to FAN_PIN"
+    #endif
+    #if EXTRUDER_2_AUTO_FAN_PIN == FAN_PIN 
+       #error "You cannot set EXTRUDER_2_AUTO_FAN_PIN equal to FAN_PIN"
+    #endif
+  #endif 
+
+void setExtruderAutoFanState(int pin, bool state)
+{
+  unsigned char newFanSpeed = (state != 0) ? EXTRUDER_AUTO_FAN_SPEED : 0;
+  // this idiom allows both digital and PWM fan outputs (see M42 handling).
+  pinMode(pin, OUTPUT);
+  digitalWrite(pin, newFanSpeed);
+  analogWrite(pin, newFanSpeed);
+}
+
+void checkExtruderAutoFans()
+{
+  uint8_t fanState = 0;
+
+  // which fan pins need to be turned on?      
+  #if EXTRUDER_0_AUTO_FAN_PIN > 0
+    if (current_temperature[0] > EXTRUDER_AUTO_FAN_TEMPERATURE) 
+      fanState |= 1;
+  #endif
+  #if EXTRUDER_1_AUTO_FAN_PIN > 0
+    if (current_temperature[1] > EXTRUDER_AUTO_FAN_TEMPERATURE) 
+    {
+      if (EXTRUDER_1_AUTO_FAN_PIN == EXTRUDER_0_AUTO_FAN_PIN) 
+        fanState |= 1;
+      else
+        fanState |= 2;
+    }
+  #endif
+  #if EXTRUDER_2_AUTO_FAN_PIN > 0
+    if (current_temperature[2] > EXTRUDER_AUTO_FAN_TEMPERATURE) 
+    {
+      if (EXTRUDER_2_AUTO_FAN_PIN == EXTRUDER_0_AUTO_FAN_PIN) 
+        fanState |= 1;
+      else if (EXTRUDER_2_AUTO_FAN_PIN == EXTRUDER_1_AUTO_FAN_PIN) 
+        fanState |= 2;
+      else
+        fanState |= 4;
+    }
+  #endif
+  
+  // update extruder auto fan states
+  #if EXTRUDER_0_AUTO_FAN_PIN > 0
+    setExtruderAutoFanState(EXTRUDER_0_AUTO_FAN_PIN, (fanState & 1) != 0);
+  #endif 
+  #if EXTRUDER_1_AUTO_FAN_PIN > 0
+    if (EXTRUDER_1_AUTO_FAN_PIN != EXTRUDER_0_AUTO_FAN_PIN) 
+      setExtruderAutoFanState(EXTRUDER_1_AUTO_FAN_PIN, (fanState & 2) != 0);
+  #endif 
+  #if EXTRUDER_2_AUTO_FAN_PIN > 0
+    if (EXTRUDER_2_AUTO_FAN_PIN != EXTRUDER_0_AUTO_FAN_PIN 
+        && EXTRUDER_2_AUTO_FAN_PIN != EXTRUDER_1_AUTO_FAN_PIN)
+      setExtruderAutoFanState(EXTRUDER_2_AUTO_FAN_PIN, (fanState & 4) != 0);
+  #endif 
+}
+
+#endif // any extruder auto fan pins set
+
 void manage_heater()
 {
   float pid_input;
@@ -399,6 +470,13 @@ void manage_heater()
 
   } // End extruder for loop
 
+  #if EXTRUDER_0_AUTO_FAN_PIN > 0 || EXTRUDER_1_AUTO_FAN_PIN > 0 || EXTRUDER_2_AUTO_FAN_PIN > 0
+  if(millis() - extruder_autofan_last_check > 2500)  // only need to check fan state very infrequently
+  {
+    checkExtruderAutoFans();
+    extruder_autofan_last_check = millis();
+  }  
+  #endif       
   
   #ifndef PIDTEMPBED
   if(millis() - previous_millis_bed_heater < BED_CHECK_INTERVAL)

README.md

@@ -1,10 +1,13 @@
-WARNING: 
+==========================
---------
+Marlin 3D Printer Firmware
-THIS IS RELEASE CANDIDATE 2 FOR MARLIN 1.0.0
+==========================
 
-The configuration is now split in two files
+Notes: 
-Configuration.h for the normal settings
+-----
-Configuration_adv.h for the advanced settings
+
+The configuration is now split in two files:
+  Configuration.h for the normal settings
+  Configuration_adv.h for the advanced settings
 
 Gen7T is not supported.
 
@@ -46,6 +49,7 @@ Features:
 *   PID tuning
 *   CoreXY kinematics (www.corexy.com/theory.html)
 *   Configurable serial port to support connection of wireless adaptors.
+*   Automatic operation of extruder/cold-end cooling fans based on nozzle temperature
 
 The default baudrate is 250000. This baudrate has less jitter and hence errors than the usual 115200 baud, but is less supported by drivers and host-environments.