Add PID BED DEBUG

MarlinKimbra/Configuration.h

@@ -263,6 +263,7 @@
 #define MAX_BED_POWER 255 // limits duty cycle to bed; 255=full current
 
 #ifdef PIDTEMPBED
+  //#define PID_BED_DEBUG // Sends debug data to the serial port.
   // 120v 250W silicone heater into 4mm borosilicate (MendelMax 1.5+)
   // from FOPDT model - kp=.39 Tp=405 Tdead=66, Tc set to 79.2, aggressive factor of 0.15 (vs 0.1, 1, 10)
   #define DEFAULT_bedKp 10.00

MarlinKimbra/temperature.cpp

@@ -708,6 +708,21 @@ void manage_heater()
       pid_output = constrain(target_temperature_bed, 0, MAX_BED_POWER);
     #endif //PID_OPENLOOP
 
+    #ifdef PID_BED_DEBUG
+      SERIAL_ECHO_START;
+      SERIAL_ECHO(" PID_BED_DEBUG ");
+      SERIAL_ECHO(": Input ");
+      SERIAL_ECHO(pid_input);
+      SERIAL_ECHO(" Output ");
+      SERIAL_ECHO(pid_output);
+      SERIAL_ECHO(" pTerm ");
+      SERIAL_ECHO(pTerm_bed);
+      SERIAL_ECHO(" iTerm ");
+      SERIAL_ECHO(iTerm_bed);
+      SERIAL_ECHO(" dTerm ");
+      SERIAL_ECHOLN(dTerm_bed);
+    #endif //PID_BED_DEBUG
+
 	  if((current_temperature_bed > BED_MINTEMP) && (current_temperature_bed < BED_MAXTEMP)) 
 	  {
 	    soft_pwm_bed = (int)pid_output >> 1;