From 5c44f6c434073180b10859d24bcec45e64b98fcd Mon Sep 17 00:00:00 2001
From: Alex Borro <alexborro@gmail.com>
Date: Wed, 27 Nov 2013 23:23:06 -0200
Subject: [PATCH] Bed Heater monitoring in Controller Fan

In some cases the Bed Heater FET heats up more then stepper drivers, so
this change add the bed monitoring to the controller fan. As soon as the
bed heater is turned on, the controller fan will run as well.
---
 Marlin/Marlin_main.cpp | 2 +-
 Marlin/temperature.cpp | 4 +++-
 Marlin/temperature.h   | 4 ++++
 3 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/Marlin/Marlin_main.cpp b/Marlin/Marlin_main.cpp
index 1537d3199a..8993ca6955 100644
--- a/Marlin/Marlin_main.cpp
+++ b/Marlin/Marlin_main.cpp
@@ -3065,7 +3065,7 @@ void controllerFan()
   {
     lastMotorCheck = millis();
 
-    if(!READ(X_ENABLE_PIN) || !READ(Y_ENABLE_PIN) || !READ(Z_ENABLE_PIN)
+    if(!READ(X_ENABLE_PIN) || !READ(Y_ENABLE_PIN) || !READ(Z_ENABLE_PIN) || (soft_pwm_bed > 0)
     #if EXTRUDERS > 2
        || !READ(E2_ENABLE_PIN)
     #endif
diff --git a/Marlin/temperature.cpp b/Marlin/temperature.cpp
index 48960488b8..29050b84f5 100644
--- a/Marlin/temperature.cpp
+++ b/Marlin/temperature.cpp
@@ -65,6 +65,8 @@ float current_temperature_bed = 0.0;
 #ifdef FAN_SOFT_PWM
   unsigned char fanSpeedSoftPwm;
 #endif
+
+unsigned char soft_pwm_bed;
   
 #ifdef BABYSTEPPING
   volatile int babystepsTodo[3]={0,0,0};
@@ -105,7 +107,7 @@ static volatile bool temp_meas_ready = false;
 	static unsigned long  previous_millis_bed_heater;
 #endif //PIDTEMPBED
   static unsigned char soft_pwm[EXTRUDERS];
-  static unsigned char soft_pwm_bed;
+
 #ifdef FAN_SOFT_PWM
   static unsigned char soft_pwm_fan;
 #endif
diff --git a/Marlin/temperature.h b/Marlin/temperature.h
index 1bf47e02ed..82de2402f0 100644
--- a/Marlin/temperature.h
+++ b/Marlin/temperature.h
@@ -45,6 +45,10 @@ extern float current_temperature_bed;
   extern float redundant_temperature;
 #endif
 
+#if defined(CONTROLLERFAN_PIN) && CONTROLLERFAN_PIN > -1
+  extern unsigned char soft_pwm_bed;
+#endif
+
 #ifdef PIDTEMP
   extern float Kp,Ki,Kd,Kc;
   float scalePID_i(float i);