Chamber Heater PID (#21156)

Co-authored-by: Scott Lahteine <thinkyhead@users.noreply.github.com>

Marlin/Configuration.h

@@ -447,6 +447,10 @@
 #define TEMP_BED_WINDOW          1  // (°C) Temperature proximity for the "temperature reached" timer
 #define TEMP_BED_HYSTERESIS      3  // (°C) Temperature proximity considered "close enough" to the target
 
+#define TEMP_CHAMBER_RESIDENCY_TIME 10  // (seconds) Time to wait for chamber to "settle" in M191
+#define TEMP_CHAMBER_WINDOW      1  // (°C) Temperature proximity for the "temperature reached" timer
+#define TEMP_CHAMBER_HYSTERESIS  3  // (°C) Temperature proximity considered "close enough" to the target
+
 // Below this temperature the heater will be switched off
 // because it probably indicates a broken thermistor wire.
 #define HEATER_0_MINTEMP   5
@@ -458,6 +462,7 @@
 #define HEATER_6_MINTEMP   5
 #define HEATER_7_MINTEMP   5
 #define BED_MINTEMP        5
+#define CHAMBER_MINTEMP    5
 
 // Above this temperature the heater will be switched off.
 // This can protect components from overheating, but NOT from shorts and failures.
@@ -471,6 +476,7 @@
 #define HEATER_6_MAXTEMP 275
 #define HEATER_7_MAXTEMP 275
 #define BED_MAXTEMP      150
+#define CHAMBER_MAXTEMP  60
 
 //===========================================================================
 //============================= PID Settings ================================
@@ -544,7 +550,52 @@
   // FIND YOUR OWN: "M303 E-1 C8 S90" to run autotune on the bed at 90 degreesC for 8 cycles.
 #endif // PIDTEMPBED
 
-#if EITHER(PIDTEMP, PIDTEMPBED)
+//===========================================================================
+//==================== PID > Chamber Temperature Control ====================
+//===========================================================================
+
+/**
+ * PID Chamber Heating
+ *
+ * If this option is enabled set PID constants below.
+ * If this option is disabled, bang-bang will be used and CHAMBER_LIMIT_SWITCHING will enable
+ * hysteresis.
+ *
+ * The PID frequency will be the same as the extruder PWM.
+ * If PID_dT is the default, and correct for the hardware/configuration, that means 7.689Hz,
+ * which is fine for driving a square wave into a resistive load and does not significantly
+ * impact FET heating. This also works fine on a Fotek SSR-10DA Solid State Relay into a 200W
+ * heater. If your configuration is significantly different than this and you don't understand
+ * the issues involved, don't use chamber PID until someone else verifies that your hardware works.
+ */
+//#define PIDTEMPCHAMBER
+
+//#define CHAMBER_LIMIT_SWITCHING
+
+/**
+ * Max Chamber Power
+ * Applies to all forms of chamber control (PID, bang-bang, and bang-bang with hysteresis).
+ * When set to any value below 255, enables a form of PWM to the chamber heater that acts like a divider
+ * so don't use it unless you are OK with PWM on your heater. (See the comment on enabling PIDTEMPCHAMBER)
+ */
+#define MAX_CHAMBER_POWER 255 // limits duty cycle to chamber heater; 255=full current
+
+#if ENABLED(PIDTEMPCHAMBER)
+  #define MIN_CHAMBER_POWER 0
+  //#define PID_CHAMBER_DEBUG // Sends debug data to the serial port.
+
+  // Lasko "MyHeat Personal Heater" (200w) modified with a Fotek SSR-10DA to control only the heating element
+  // and placed inside the small Creality printer enclosure tent.
+  //
+  #define DEFAULT_chamberKp 37.04
+  #define DEFAULT_chamberKi 1.40
+  #define DEFAULT_chamberKd 655.17
+  // M309 P37.04 I1.04 D655.17
+
+  // FIND YOUR OWN: "M303 E-2 C8 S50" to run autotune on the chamber at 50 degreesC for 8 cycles.
+#endif // PIDTEMPCHAMBER
+
+#if ANY(PIDTEMP, PIDTEMPBED, PIDTEMPCHAMBER)
   //#define PID_DEBUG             // Sends debug data to the serial port. Use 'M303 D' to toggle activation.
   //#define PID_OPENLOOP          // 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 (roughly 0.125Hz=8s) and minimum state time of approximately 1s useful for heaters driven by a relay
@@ -1624,11 +1675,13 @@
 #define PREHEAT_1_LABEL       "PLA"
 #define PREHEAT_1_TEMP_HOTEND 180
 #define PREHEAT_1_TEMP_BED     70
+#define PREHEAT_1_TEMP_CHAMBER 35
 #define PREHEAT_1_FAN_SPEED     0 // Value from 0 to 255
 
 #define PREHEAT_2_LABEL       "ABS"
 #define PREHEAT_2_TEMP_HOTEND 240
 #define PREHEAT_2_TEMP_BED    110
+#define PREHEAT_2_TEMP_CHAMBER 35
 #define PREHEAT_2_FAN_SPEED     0 // Value from 0 to 255
 
 /**

Marlin/Configuration_adv.h

@@ -143,12 +143,19 @@
 //
 // Heated Chamber options
 //
+#if DISABLED(PIDTEMPCHAMBER)
+  #define CHAMBER_CHECK_INTERVAL 5000   // (ms) Interval between checks in bang-bang control
+  #if ENABLED(CHAMBER_LIMIT_SWITCHING)
+    #define CHAMBER_HYSTERESIS 2        // (°C) Only set the relevant heater state when ABS(T-target) > CHAMBER_HYSTERESIS
+  #endif
+#endif
+
 #if TEMP_SENSOR_CHAMBER
-  #define CHAMBER_MINTEMP             5
-  #define CHAMBER_MAXTEMP            60
-  #define TEMP_CHAMBER_HYSTERESIS     1   // (°C) Temperature proximity considered "close enough" to the target
-  //#define CHAMBER_LIMIT_SWITCHING
-  //#define HEATER_CHAMBER_PIN       44   // Chamber heater on/off pin
+  // Make sure you define where your heater is connected, the following works on a BTT SKR 1.4 Turbo
+  // using the secondary tool heater output. (FAN1 by default).
+  //#define FAN1_PIN                   -1   // Remove the fan signal on pin P2_04 (SKR 1.4 Turbo specific)
+  //#define HEATER_CHAMBER_PIN      P2_04   // Chamber heater on/off pin (HE1 connector on SKR 1.4 Turbo)
+
   //#define HEATER_CHAMBER_INVERTING false
 
   //#define CHAMBER_FAN               // Enable a fan on the chamber

Marlin/src/core/language.h

@@ -221,7 +221,7 @@
 
 // temperature.cpp strings
 #define STR_PID_AUTOTUNE_START              "PID Autotune start"
-#define STR_PID_BAD_EXTRUDER_NUM            "PID Autotune failed! Bad extruder number"
+#define STR_PID_BAD_HEATER_ID               "PID Autotune failed! Bad heater id"
 #define STR_PID_TEMP_TOO_HIGH               "PID Autotune failed! Temperature too high"
 #define STR_PID_TIMEOUT                     "PID Autotune failed! timeout"
 #define STR_BIAS                            " bias: "

Marlin/src/feature/leds/printer_event_leds.cpp

@@ -77,6 +77,19 @@ PrinterEventLEDs printerEventLEDs;
       pel_set_rgb(red, 0, 255);
     }
   }
+
+#endif
+
+#if HAS_HEATED_CHAMBER
+
+  void PrinterEventLEDs::onChamberHeating(const float &start, const float &current, const float &target) {
+    const uint8_t green = pel_intensity(start, current, target);
+    if (green != old_intensity) {
+      old_intensity = green;
+      pel_set_rgb(255, green, 255);
+    }
+  }
+
 #endif
 
 #endif // PRINTER_EVENT_LEDS

Marlin/src/feature/leds/printer_event_leds.h

@@ -55,7 +55,12 @@ public:
     static void onBedHeating(const float &start, const float &current, const float &target);
   #endif
 
-  #if HAS_TEMP_HOTEND || HAS_HEATED_BED
+  #if HAS_HEATED_CHAMBER
+    static inline LEDColor onChamberHeatingStart() { old_intensity = 127; return leds.get_color(); }
+    static void onChamberHeating(const float &start, const float &current, const float &target);
+  #endif
+
+  #if HAS_TEMP_HOTEND || HAS_HEATED_BED || HAS_HEATED_CHAMBER
     static inline void onHeatingDone() { leds.set_white(); }
     static inline void onPidTuningDone(LEDColor c) { leds.set_color(c); }
   #endif

Marlin/src/gcode/config/M309.cpp

@@ -0,0 +1,48 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "../../inc/MarlinConfig.h"
+
+#if ENABLED(PIDTEMPCHAMBER)
+
+#include "../gcode.h"
+#include "../../module/temperature.h"
+
+/**
+ * M309 - Set and/or Report the current Chamber PID values
+ *
+ *  P<pval> - Set the P value
+ *  I<ival> - Set the I value
+ *  D<dval> - Set the D value
+ */
+void GcodeSuite::M309() {
+  if (parser.seen('P')) thermalManager.temp_chamber.pid.Kp = parser.value_float();
+  if (parser.seen('I')) thermalManager.temp_chamber.pid.Ki = scalePID_i(parser.value_float());
+  if (parser.seen('D')) thermalManager.temp_chamber.pid.Kd = scalePID_d(parser.value_float());
+
+  SERIAL_ECHO_START();
+  SERIAL_ECHOLNPAIR(" p:", thermalManager.temp_chamber.pid.Kp,
+                    " i:", unscalePID_i(thermalManager.temp_chamber.pid.Ki),
+                    " d:", unscalePID_d(thermalManager.temp_chamber.pid.Kd));
+}
+
+#endif // PIDTEMPCHAMBER

Marlin/src/gcode/gcode.cpp

@@ -682,6 +682,10 @@ void GcodeSuite::process_parsed_command(const bool no_ok/*=false*/) {
         case 304: M304(); break;                                  // M304: Set bed PID parameters
       #endif
 
+      #if ENABLED(PIDTEMPCHAMBER)
+        case 309: M309(); break;                                  // M309: Set chamber PID parameters
+      #endif
+
       #if ENABLED(PHOTO_GCODE)
         case 240: M240(); break;                                  // M240: Trigger a camera
       #endif

Marlin/src/gcode/gcode.h

@@ -197,6 +197,7 @@
  * M303 - PID relay autotune S<temperature> sets the target temperature. Default 150C. (Requires PIDTEMP)
  * M304 - Set bed PID parameters P I and D. (Requires PIDTEMPBED)
  * M305 - Set user thermistor parameters R T and P. (Requires TEMP_SENSOR_x 1000)
+ * M309 - Set chamber PID parameters P I and D. (Requires PIDTEMPCHAMBER)
  * M350 - Set microstepping mode. (Requires digital microstepping pins.)
  * M351 - Toggle MS1 MS2 pins directly. (Requires digital microstepping pins.)
  * M355 - Set Case Light on/off and set brightness. (Requires CASE_LIGHT_PIN)
@@ -711,6 +712,8 @@ private:
 
   TERN_(HAS_USER_THERMISTORS, static void M305());
 
+  TERN_(PIDTEMPCHAMBER, static void M309());
+
   #if HAS_MICROSTEPS
     static void M350();
     static void M351();

Marlin/src/gcode/temp/M303.cpp

@@ -40,19 +40,15 @@
  *  C<cycles>       Number of times to repeat the procedure. (Minimum: 3, Default: 5)
  *  U<bool>         Flag to apply the result to the current PID values
  *
- * With PID_DEBUG:
+ * With PID_DEBUG, PID_BED_DEBUG, or PID_CHAMBER_DEBUG:
  *  D               Toggle PID debugging and EXIT without further action.
  */
 
-#if ENABLED(PID_DEBUG)
-  bool pid_debug_flag = 0;
-#endif
-
 void GcodeSuite::M303() {
 
-  #if ENABLED(PID_DEBUG)
+  #if ANY(PID_DEBUG, PID_BED_DEBUG, PID_CHAMBER_DEBUG)
     if (parser.seen('D')) {
-      pid_debug_flag = !pid_debug_flag;
+      thermalManager.pid_debug_flag ^= true;
       SERIAL_ECHO_START();
       SERIAL_ECHOPGM("PID Debug ");
       serialprintln_onoff(pid_debug_flag);
@@ -60,25 +56,34 @@ void GcodeSuite::M303() {
     }
   #endif
 
-  #define SI TERN(PIDTEMPBED, H_BED, H_E0)
-  #define EI TERN(PIDTEMP, HOTENDS - 1, H_BED)
-  const heater_id_t e = (heater_id_t)parser.intval('E');
-  if (!WITHIN(e, SI, EI)) {
-    SERIAL_ECHOLNPGM(STR_PID_BAD_EXTRUDER_NUM);
-    TERN_(EXTENSIBLE_UI, ExtUI::onPidTuning(ExtUI::result_t::PID_BAD_EXTRUDER_NUM));
-    return;
+  const heater_id_t hid = (heater_id_t)parser.intval('E');
+  int16_t default_temp;
+  switch (hid) {
+    #if ENABLED(PIDTEMP)
+      case 0 ... HOTENDS - 1: default_temp = PREHEAT_1_TEMP_HOTEND; break;
+    #endif
+    #if ENABLED(PIDTEMPBED)
+      case H_BED: default_temp = PREHEAT_1_TEMP_BED; break;
+    #endif
+    #if ENABLED(PIDTEMPCHAMBER)
+      case H_CHAMBER: default_temp = PREHEAT_1_TEMP_CHAMBER; break;
+    #endif
+    default:
+      SERIAL_ECHOLNPGM(STR_PID_BAD_HEATER_ID);
+      TERN_(EXTENSIBLE_UI, ExtUI::onPidTuning(ExtUI::result_t::PID_BAD_EXTRUDER_NUM));
+      return;
   }
 
+  const int16_t temp = parser.celsiusval('S', default_temp);
   const int c = parser.intval('C', 5);
   const bool u = parser.boolval('U');
-  const int16_t temp = parser.celsiusval('S', e < 0 ? PREHEAT_1_TEMP_BED : PREHEAT_1_TEMP_HOTEND);
 
   #if DISABLED(BUSY_WHILE_HEATING)
     KEEPALIVE_STATE(NOT_BUSY);
   #endif
 
   LCD_MESSAGEPGM(MSG_PID_AUTOTUNE);
-  thermalManager.PID_autotune(temp, e, c, u);
+  thermalManager.PID_autotune(temp, hid, c, u);
   ui.reset_status();
 }
 

Marlin/src/inc/Conditionals_post.h

@@ -1992,27 +1992,31 @@
     #define BED_OVERSHOOT 10
   #endif
   #define BED_MAX_TARGET (BED_MAXTEMP - (BED_OVERSHOOT))
+#else
+  #undef PIDTEMPBED
 #endif
+
 #if HAS_HEATED_BED || HAS_TEMP_CHAMBER
   #define BED_OR_CHAMBER 1
 #endif
 #if HAS_TEMP_HOTEND || BED_OR_CHAMBER || HAS_TEMP_PROBE
   #define HAS_TEMP_SENSOR 1
 #endif
+
 #if HAS_TEMP_CHAMBER && PIN_EXISTS(HEATER_CHAMBER)
   #define HAS_HEATED_CHAMBER 1
+  #ifndef CHAMBER_OVERSHOOT
+    #define CHAMBER_OVERSHOOT 10
+  #endif
+  #define CHAMBER_MAX_TARGET (CHAMBER_MAXTEMP - (CHAMBER_OVERSHOOT))
+#else
+  #undef PIDTEMPCHAMBER
 #endif
 
 // PID heating
-#if !HAS_HEATED_BED
-  #undef PIDTEMPBED
-#endif
-#if EITHER(PIDTEMP, PIDTEMPBED)
+#if ANY(PIDTEMP, PIDTEMPBED, PIDTEMPCHAMBER)
   #define HAS_PID_HEATING 1
 #endif
-#if BOTH(PIDTEMP, PIDTEMPBED)
-  #define HAS_PID_FOR_BOTH 1
-#endif
 
 // Thermal protection
 #if BOTH(HAS_HEATED_BED, THERMAL_PROTECTION_BED)
@@ -2346,6 +2350,9 @@
  * Heated chamber requires settings
  */
 #if HAS_HEATED_CHAMBER
+  #ifndef MIN_CHAMBER_POWER
+    #define MIN_CHAMBER_POWER 0
+  #endif
   #ifndef MAX_CHAMBER_POWER
     #define MAX_CHAMBER_POWER 255
   #endif

Marlin/src/inc/SanityCheck.h

@@ -1204,6 +1204,13 @@ static_assert(Y_MAX_LENGTH >= Y_BED_SIZE, "Movement bounds (Y_MIN_POS, Y_MAX_POS
 #endif
 
 /**
+ * Chamber Heating Options - PID vs Limit Switching
+ */
+#if BOTH(PIDTEMPCHAMBER, CHAMBER_LIMIT_SWITCHING)
+  #error "To use CHAMBER_LIMIT_SWITCHING you must disable PIDTEMPCHAMBER."
+#endif
+
+/**
  * Kinematics
  */
 

Marlin/src/lcd/menu/menu_advanced.cpp

@@ -177,18 +177,25 @@ void menu_backlash();
   #if ENABLED(PIDTEMPBED)
     int16_t autotune_temp_bed = PREHEAT_1_TEMP_BED;
   #endif
+  #if ENABLED(PIDTEMPCHAMBER)
+    int16_t autotune_temp_chamber = PREHEAT_1_TEMP_CHAMBER;
+  #endif
 
   #include "../../gcode/queue.h"
 
-  void _lcd_autotune(const int16_t e) {
+  void _lcd_autotune(const heater_id_t hid) {
     char cmd[30];
-    sprintf_P(cmd, PSTR("M303 U1 E%i S%i"), e,
-      #if HAS_PID_FOR_BOTH
-        e < 0 ? autotune_temp_bed : autotune_temp[e]
-      #else
-        TERN(PIDTEMPBED, autotune_temp_bed, autotune_temp[e])
+    int16_t tune_temp;
+    switch (hid) {
+      #if ENABLED(PIDTEMPBED)
+        case H_BED: tune_temp = autotune_temp_bed; break;
       #endif
-    );
+      #if ENABLED(PIDTEMPCHAMBER)
+        case H_CHAMBER: tune_temp = autotune_temp_chamber; break;
+      #endif
+      default: tune_temp = autotune_temp[hid]; break;
+    }
+    sprintf_P(cmd, PSTR("M303 U1 E%i S%i"), hid, tune_temp);
     queue.inject(cmd);
     ui.return_to_status();
   }
@@ -225,7 +232,7 @@ void menu_backlash();
 #if ENABLED(PID_AUTOTUNE_MENU)
   #define DEFINE_PIDTEMP_FUNCS(N) \
     _DEFINE_PIDTEMP_BASE_FUNCS(N); \
-    void lcd_autotune_callback_E##N() { _lcd_autotune(N); }
+    void lcd_autotune_callback_E##N() { _lcd_autotune(heater_id_t(N)); }
 #else
   #define DEFINE_PIDTEMP_FUNCS(N) _DEFINE_PIDTEMP_BASE_FUNCS(N);
 #endif
@@ -269,56 +276,70 @@ void menu_backlash();
     //
 
     #if ENABLED(PID_EDIT_MENU)
-      #define __PID_BASE_MENU_ITEMS(N) \
-        raw_Ki = unscalePID_i(TERN(PID_BED_MENU_SECTION, thermalManager.temp_bed.pid.Ki, PID_PARAM(Ki, N))); \
-        raw_Kd = unscalePID_d(TERN(PID_BED_MENU_SECTION, thermalManager.temp_bed.pid.Kd, PID_PARAM(Kd, N))); \
-        EDIT_ITEM_FAST_N(float41sign, N, MSG_PID_P_E, &TERN(PID_BED_MENU_SECTION, thermalManager.temp_bed.pid.Kp, PID_PARAM(Kp, N)), 1, 9990); \
+      #define _PID_EDIT_ITEMS_TMPL(N,T) \
+        raw_Ki = unscalePID_i(T.pid.Ki); \
+        raw_Kd = unscalePID_d(T.pid.Kd); \
+        EDIT_ITEM_FAST_N(float41sign, N, MSG_PID_P_E, &T.pid.Kp, 1, 9990); \
+        EDIT_ITEM_FAST_N(float52sign, N, MSG_PID_I_E, &raw_Ki, 0.01f, 9990, []{ copy_and_scalePID_i(N); }); \
+        EDIT_ITEM_FAST_N(float41sign, N, MSG_PID_D_E, &raw_Kd, 1, 9990, []{ copy_and_scalePID_d(N); })
+
+      #define __PID_HOTEND_MENU_ITEMS(N) \
+        raw_Ki = unscalePID_i(PID_PARAM(Ki, N)); \
+        raw_Kd = unscalePID_d(PID_PARAM(Kd, N)); \
+        EDIT_ITEM_FAST_N(float41sign, N, MSG_PID_P_E, &PID_PARAM(Kp, N), 1, 9990); \
         EDIT_ITEM_FAST_N(float52sign, N, MSG_PID_I_E, &raw_Ki, 0.01f, 9990, []{ copy_and_scalePID_i(N); }); \
         EDIT_ITEM_FAST_N(float41sign, N, MSG_PID_D_E, &raw_Kd, 1, 9990, []{ copy_and_scalePID_d(N); })
 
       #if ENABLED(PID_EXTRUSION_SCALING)
-        #define _PID_BASE_MENU_ITEMS(N) \
-          __PID_BASE_MENU_ITEMS(N); \
+        #define _PID_HOTEND_MENU_ITEMS(N) \
+          __PID_HOTEND_MENU_ITEMS(N); \
           EDIT_ITEM_N(float4, N, MSG_PID_C_E, &PID_PARAM(Kc, N), 1, 9990)
       #else
-        #define _PID_BASE_MENU_ITEMS(N) __PID_BASE_MENU_ITEMS(N)
+        #define _PID_HOTEND_MENU_ITEMS(N) __PID_HOTEND_MENU_ITEMS(N)
       #endif
 
       #if ENABLED(PID_FAN_SCALING)
-        #define _PID_EDIT_MENU_ITEMS(N) \
-          _PID_BASE_MENU_ITEMS(N); \
+        #define _HOTEND_PID_EDIT_MENU_ITEMS(N) \
+          _PID_HOTEND_MENU_ITEMS(N); \
           EDIT_ITEM_N(float4, N, MSG_PID_F_E, &PID_PARAM(Kf, N), 1, 9990)
       #else
-        #define _PID_EDIT_MENU_ITEMS(N) _PID_BASE_MENU_ITEMS(N)
+        #define _HOTEND_PID_EDIT_MENU_ITEMS(N) _PID_HOTEND_MENU_ITEMS(N)
       #endif
 
     #else
 
-      #define _PID_EDIT_MENU_ITEMS(N) NOOP
+      #define _HOTEND_PID_EDIT_MENU_ITEMS(N) NOOP
 
     #endif
 
     #if ENABLED(PID_AUTOTUNE_MENU)
-      #define PID_EDIT_MENU_ITEMS(N) \
-        _PID_EDIT_MENU_ITEMS(N); \
-        EDIT_ITEM_FAST_N(int3, N, MSG_PID_AUTOTUNE_E, &autotune_temp[N], 150, thermalManager.heater_maxtemp[N] - HOTEND_OVERSHOOT, []{ _lcd_autotune(MenuItemBase::itemIndex); });
+      #define HOTEND_PID_EDIT_MENU_ITEMS(N) \
+        _HOTEND_PID_EDIT_MENU_ITEMS(N); \
+        EDIT_ITEM_FAST_N(int3, N, MSG_PID_AUTOTUNE_E, &autotune_temp[N], 150, thermalManager.heater_maxtemp[N] - HOTEND_OVERSHOOT, []{ _lcd_autotune(heater_id_t(MenuItemBase::itemIndex)); });
     #else
-      #define PID_EDIT_MENU_ITEMS(N) _PID_EDIT_MENU_ITEMS(N);
+      #define HOTEND_PID_EDIT_MENU_ITEMS(N) _HOTEND_PID_EDIT_MENU_ITEMS(N);
     #endif
 
-    PID_EDIT_MENU_ITEMS(0);
+    HOTEND_PID_EDIT_MENU_ITEMS(0);
     #if ENABLED(PID_PARAMS_PER_HOTEND)
-      REPEAT_S(1, HOTENDS, PID_EDIT_MENU_ITEMS)
+      REPEAT_S(1, HOTENDS, HOTEND_PID_EDIT_MENU_ITEMS)
     #endif
 
     #if ENABLED(PIDTEMPBED)
       #if ENABLED(PID_EDIT_MENU)
-        #define PID_BED_MENU_SECTION
-        __PID_BASE_MENU_ITEMS(-1);
-        #undef PID_BED_MENU_SECTION
+        _PID_EDIT_ITEMS_TMPL(H_BED, thermalManager.temp_bed);
+      #endif
+      #if ENABLED(PID_AUTOTUNE_MENU)
+        EDIT_ITEM_FAST_N(int3, H_BED, MSG_PID_AUTOTUNE_E, &autotune_temp_bed, PREHEAT_1_TEMP_BED, BED_MAX_TARGET, []{ _lcd_autotune(H_BED); });
+      #endif
+    #endif
+
+    #if ENABLED(PIDTEMPCHAMBER)
+      #if ENABLED(PID_EDIT_MENU)
+        _PID_EDIT_ITEMS_TMPL(H_CHAMBER, thermalManager.temp_chamber);
       #endif
       #if ENABLED(PID_AUTOTUNE_MENU)
-        EDIT_ITEM_FAST_N(int3, -1, MSG_PID_AUTOTUNE_E, &autotune_temp_bed, PREHEAT_1_TEMP_BED, BED_MAX_TARGET, []{ _lcd_autotune(-1); });
+        EDIT_ITEM_FAST_N(int3, H_CHAMBER, MSG_PID_AUTOTUNE_E, &autotune_temp_chamber, PREHEAT_1_TEMP_CHAMBER, CHAMBER_MAX_TARGET, []{ _lcd_autotune(H_CHAMBER); });
       #endif
     #endif
 

Marlin/src/module/settings.cpp

@@ -319,6 +319,11 @@ typedef struct SettingsDataStruct {
   PID_t bedPID;                                         // M304 PID / M303 E-1 U
 
   //
+  // PIDTEMPCHAMBER
+  //
+  PID_t chamberPID;                                     // M309 PID / M303 E-2 U
+
+  //
   // User-defined Thermistors
   //
   #if HAS_USER_THERMISTORS
@@ -927,6 +932,25 @@ void MarlinSettings::postprocess() {
     }
 
     //
+    // PIDTEMPCHAMBER
+    //
+    {
+      _FIELD_TEST(chamberPID);
+
+      const PID_t chamber_pid = {
+        #if DISABLED(PIDTEMPCHAMBER)
+          NAN, NAN, NAN
+        #else
+          // Store the unscaled PID values
+          thermalManager.temp_chamber.pid.Kp,
+          unscalePID_i(thermalManager.temp_chamber.pid.Ki),
+          unscalePID_d(thermalManager.temp_chamber.pid.Kd)
+        #endif
+      };
+      EEPROM_WRITE(chamber_pid);
+    }
+
+    //
     // User-defined Thermistors
     //
     #if HAS_USER_THERMISTORS
@@ -1788,6 +1812,22 @@ void MarlinSettings::postprocess() {
       }
 
       //
+      // Heated Chamber PID
+      //
+      {
+        PID_t pid;
+        EEPROM_READ(pid);
+        #if ENABLED(PIDTEMPCHAMBER)
+          if (!validating && !isnan(pid.Kp)) {
+            // Scale PID values since EEPROM values are unscaled
+            thermalManager.temp_chamber.pid.Kp = pid.Kp;
+            thermalManager.temp_chamber.pid.Ki = scalePID_i(pid.Ki);
+            thermalManager.temp_chamber.pid.Kd = scalePID_d(pid.Kd);
+          }
+        #endif
+      }
+
+      //
       // User-defined Thermistors
       //
       #if HAS_USER_THERMISTORS
@@ -2812,6 +2852,16 @@ void MarlinSettings::reset() {
   #endif
 
   //
+  // Heated Chamber PID
+  //
+
+  #if ENABLED(PIDTEMPCHAMBER)
+    thermalManager.temp_chamber.pid.Kp = DEFAULT_chamberKp;
+    thermalManager.temp_chamber.pid.Ki = scalePID_i(DEFAULT_chamberKi);
+    thermalManager.temp_chamber.pid.Kd = scalePID_d(DEFAULT_chamberKd);
+  #endif
+
+  //
   // User-Defined Thermistors
   //
   TERN_(HAS_USER_THERMISTORS, thermalManager.reset_user_thermistors());
@@ -3386,7 +3436,16 @@ void MarlinSettings::reset() {
         );
       #endif
 
-    #endif // PIDTEMP || PIDTEMPBED
+      #if ENABLED(PIDTEMPCHAMBER)
+        CONFIG_ECHO_START();
+        SERIAL_ECHOLNPAIR(
+            "  M309 P", thermalManager.temp_chamber.pid.Kp
+          , " I", unscalePID_i(thermalManager.temp_chamber.pid.Ki)
+          , " D", unscalePID_d(thermalManager.temp_chamber.pid.Kd)
+        );
+      #endif
+
+    #endif // PIDTEMP || PIDTEMPBED || PIDTEMPCHAMBER
 
     #if HAS_USER_THERMISTORS
       CONFIG_ECHO_HEADING("User thermistors:");

Marlin/src/module/temperature.cpp

@@ -371,10 +371,8 @@ const char str_t_thermal_runaway[] PROGMEM = STR_T_THERMAL_RUNAWAY,
     #ifdef CHAMBER_MAXTEMP
       int16_t Temperature::maxtemp_raw_CHAMBER = TEMP_SENSOR_CHAMBER_RAW_HI_TEMP;
     #endif
-    #if WATCH_CHAMBER
-      chamber_watch_t Temperature::watch_chamber{0};
-    #endif
-    millis_t Temperature::next_chamber_check_ms;
+    TERN_(WATCH_CHAMBER, chamber_watch_t Temperature::watch_chamber{0});
+    IF_DISABLED(PIDTEMPCHAMBER, millis_t Temperature::next_chamber_check_ms);
   #endif // HAS_HEATED_CHAMBER
 #endif // HAS_TEMP_CHAMBER
 
@@ -382,11 +380,6 @@ const char str_t_thermal_runaway[] PROGMEM = STR_T_THERMAL_RUNAWAY,
   probe_info_t Temperature::temp_probe; // = { 0 }
 #endif
 
-// Initialized by settings.load()
-#if ENABLED(PIDTEMP)
-  //hotend_pid_t Temperature::pid[HOTENDS];
-#endif
-
 #if ENABLED(PREVENT_COLD_EXTRUSION)
   bool Temperature::allow_cold_extrude = false;
   int16_t Temperature::extrude_min_temp = EXTRUDE_MINTEMP;
@@ -485,41 +478,44 @@ volatile bool Temperature::raw_temps_ready = false;
     millis_t next_temp_ms = millis(), t1 = next_temp_ms, t2 = next_temp_ms;
     long t_high = 0, t_low = 0;
 
-    long bias, d;
     PID_t tune_pid = { 0, 0, 0 };
     float maxT = 0, minT = 10000;
 
     const bool isbed = (heater_id == H_BED);
+    const bool ischamber = (heater_id == H_CHAMBER);
 
-    #if HAS_PID_FOR_BOTH
-      #define GHV(B,H) (isbed ? (B) : (H))
-      #define SHV(B,H) do{ if (isbed) temp_bed.soft_pwm_amount = B; else temp_hotend[heater_id].soft_pwm_amount = H; }while(0)
-      #define ONHEATINGSTART() (isbed ? printerEventLEDs.onBedHeatingStart() : printerEventLEDs.onHotendHeatingStart())
-      #define ONHEATING(S,C,T) (isbed ? printerEventLEDs.onBedHeating(S,C,T) : printerEventLEDs.onHotendHeating(S,C,T))
-    #elif ENABLED(PIDTEMPBED)
-      #define GHV(B,H) B
-      #define SHV(B,H) (temp_bed.soft_pwm_amount = B)
-      #define ONHEATINGSTART() printerEventLEDs.onBedHeatingStart()
-      #define ONHEATING(S,C,T) printerEventLEDs.onBedHeating(S,C,T)
+    #if ENABLED(PIDTEMPCHAMBER)
+      #define C_TERN(T,A,B) ((T) ? (A) : (B))
     #else
-      #define GHV(B,H) H
-      #define SHV(B,H) (temp_hotend[heater_id].soft_pwm_amount = H)
-      #define ONHEATINGSTART() printerEventLEDs.onHotendHeatingStart()
-      #define ONHEATING(S,C,T) printerEventLEDs.onHotendHeating(S,C,T)
+      #define C_TERN(T,A,B) (B)
     #endif
-    #define WATCH_PID BOTH(WATCH_BED, PIDTEMPBED) || BOTH(WATCH_HOTENDS, PIDTEMP)
+    #if ENABLED(PIDTEMPBED)
+      #define B_TERN(T,A,B) ((T) ? (A) : (B))
+    #else
+      #define B_TERN(T,A,B) (B)
+    #endif
+    #define GHV(C,B,H) C_TERN(ischamber, C, B_TERN(isbed, B, H))
+    #define SHV(V) C_TERN(ischamber, temp_chamber.soft_pwm_amount = V, B_TERN(isbed, temp_bed.soft_pwm_amount = V, temp_hotend[heater_id].soft_pwm_amount = V))
+    #define ONHEATINGSTART() C_TERN(ischamber, printerEventLEDs.onChamberHeatingStart(), B_TERN(isbed, printerEventLEDs.onBedHeatingStart(), printerEventLEDs.onHotendHeatingStart()))
+    #define ONHEATING(S,C,T) C_TERN(ischamber, printerEventLEDs.onChamberHeating(S,C,T), B_TERN(isbed, printerEventLEDs.onBedHeating(S,C,T), printerEventLEDs.onHotendHeating(S,C,T)))
+
+    #define WATCH_PID BOTH(WATCH_CHAMBER, PIDTEMPCHAMBER) || BOTH(WATCH_BED, PIDTEMPBED) || BOTH(WATCH_HOTENDS, PIDTEMP)
 
     #if WATCH_PID
-      #if ALL(THERMAL_PROTECTION_HOTENDS, PIDTEMP, THERMAL_PROTECTION_BED, PIDTEMPBED)
-        #define GTV(B,H) (isbed ? (B) : (H))
-      #elif BOTH(THERMAL_PROTECTION_HOTENDS, PIDTEMP)
-        #define GTV(B,H) (H)
+      #if BOTH(THERMAL_PROTECTION_CHAMBER, PIDTEMPCHAMBER)
+        #define C_GTV(T,A,B) ((T) ? (A) : (B))
       #else
-        #define GTV(B,H) (B)
+        #define C_GTV(T,A,B) (B)
       #endif
-      const uint16_t watch_temp_period = GTV(WATCH_BED_TEMP_PERIOD, WATCH_TEMP_PERIOD);
-      const uint8_t watch_temp_increase = GTV(WATCH_BED_TEMP_INCREASE, WATCH_TEMP_INCREASE);
-      const float watch_temp_target = target - float(watch_temp_increase + GTV(TEMP_BED_HYSTERESIS, TEMP_HYSTERESIS) + 1);
+      #if BOTH(THERMAL_PROTECTION_BED, PIDTEMPBED)
+        #define B_GTV(T,A,B) ((T) ? (A) : (B))
+      #else
+        #define B_GTV(T,A,B) (B)
+      #endif
+      #define GTV(C,B,H) C_GTV(ischamber, C, B_GTV(isbed, B, H))
+      const uint16_t watch_temp_period = GTV(WATCH_CHAMBER_TEMP_PERIOD, WATCH_BED_TEMP_PERIOD, WATCH_TEMP_PERIOD);
+      const uint8_t watch_temp_increase = GTV(WATCH_CHAMBER_TEMP_INCREASE, WATCH_BED_TEMP_INCREASE, WATCH_TEMP_INCREASE);
+      const float watch_temp_target = target - float(watch_temp_increase + GTV(TEMP_CHAMBER_HYSTERESIS, TEMP_BED_HYSTERESIS, TEMP_HYSTERESIS) + 1);
       millis_t temp_change_ms = next_temp_ms + SEC_TO_MS(watch_temp_period);
       float next_watch_temp = 0.0;
       bool heated = false;
@@ -527,7 +523,7 @@ volatile bool Temperature::raw_temps_ready = false;
 
     TERN_(HAS_AUTO_FAN, next_auto_fan_check_ms = next_temp_ms + 2500UL);
 
-    if (target > GHV(BED_MAX_TARGET, temp_range[heater_id].maxtemp - HOTEND_OVERSHOOT)) {
+    if (target > GHV(CHAMBER_MAX_TARGET, BED_MAX_TARGET, temp_range[heater_id].maxtemp - HOTEND_OVERSHOOT)) {
       SERIAL_ECHOLNPGM(STR_PID_TEMP_TOO_HIGH);
       TERN_(EXTENSIBLE_UI, ExtUI::onPidTuning(ExtUI::result_t::PID_TEMP_TOO_HIGH));
       return;
@@ -538,10 +534,11 @@ volatile bool Temperature::raw_temps_ready = false;
     disable_all_heaters();
     TERN_(AUTO_POWER_CONTROL, powerManager.power_on());
 
-    SHV(bias = d = (MAX_BED_POWER) >> 1, bias = d = (PID_MAX) >> 1);
+    long bias = GHV(MAX_CHAMBER_POWER, MAX_BED_POWER, PID_MAX) >> 1, d = bias;
+    SHV(bias);
 
     #if ENABLED(PRINTER_EVENT_LEDS)
-      const float start_temp = GHV(temp_bed.celsius, temp_hotend[heater_id].celsius);
+      const float start_temp = GHV(temp_chamber.celsius, temp_bed.celsius, temp_hotend[heater_id].celsius);
       LEDColor color = ONHEATINGSTART();
     #endif
 
@@ -557,7 +554,7 @@ volatile bool Temperature::raw_temps_ready = false;
         updateTemperaturesFromRawValues();
 
         // Get the current temperature and constrain it
-        current_temp = GHV(temp_bed.celsius, temp_hotend[heater_id].celsius);
+        current_temp = GHV(temp_chamber.celsius, temp_bed.celsius, temp_hotend[heater_id].celsius);
         NOLESS(maxT, current_temp);
         NOMORE(minT, current_temp);
 
@@ -572,67 +569,46 @@ volatile bool Temperature::raw_temps_ready = false;
           }
         #endif
 
-        if (heating && current_temp > target) {
-          if (ELAPSED(ms, t2 + 5000UL)) {
-            heating = false;
-            SHV((bias - d) >> 1, (bias - d) >> 1);
-            t1 = ms;
-            t_high = t1 - t2;
-            maxT = target;
-          }
+        if (heating && current_temp > target && ELAPSED(ms, t2 + 5000UL)) {
+          heating = false;
+          SHV((bias - d) >> 1);
+          t1 = ms;
+          t_high = t1 - t2;
+          maxT = target;
         }
 
-        if (!heating && current_temp < target) {
-          if (ELAPSED(ms, t1 + 5000UL)) {
-            heating = true;
-            t2 = ms;
-            t_low = t2 - t1;
-            if (cycles > 0) {
-              const long max_pow = GHV(MAX_BED_POWER, PID_MAX);
-              bias += (d * (t_high - t_low)) / (t_low + t_high);
-              LIMIT(bias, 20, max_pow - 20);
-              d = (bias > max_pow >> 1) ? max_pow - 1 - bias : bias;
-
-              SERIAL_ECHOPAIR(STR_BIAS, bias, STR_D_COLON, d, STR_T_MIN, minT, STR_T_MAX, maxT);
-              if (cycles > 2) {
-                const float Ku = (4.0f * d) / (float(M_PI) * (maxT - minT) * 0.5f),
-                            Tu = float(t_low + t_high) * 0.001f,
-                            pf = isbed ? 0.2f : 0.6f,
-                            df = isbed ? 1.0f / 3.0f : 1.0f / 8.0f;
-
-                SERIAL_ECHOPAIR(STR_KU, Ku, STR_TU, Tu);
-                if (isbed) { // Do not remove this otherwise PID autotune won't work right for the bed!
-                  tune_pid.Kp = Ku * 0.2f;
-                  tune_pid.Ki = 2 * tune_pid.Kp / Tu;
-                  tune_pid.Kd = tune_pid.Kp * Tu / 3;
-                  SERIAL_ECHOLNPGM("\n" " No overshoot"); // Works far better for the bed. Classic and some have bad ringing.
-                  SERIAL_ECHOLNPAIR(STR_KP, tune_pid.Kp, STR_KI, tune_pid.Ki, STR_KD, tune_pid.Kd);
-                }
-                else {
-                  tune_pid.Kp = Ku * pf;
-                  tune_pid.Kd = tune_pid.Kp * Tu * df;
-                  tune_pid.Ki = 2 * tune_pid.Kp / Tu;
-                  SERIAL_ECHOLNPGM("\n" STR_CLASSIC_PID);
-                  SERIAL_ECHOLNPAIR(STR_KP, tune_pid.Kp, STR_KI, tune_pid.Ki, STR_KD, tune_pid.Kd);
-                }
-
-                /**
-                tune_pid.Kp = 0.33 * Ku;
-                tune_pid.Ki = tune_pid.Kp / Tu;
-                tune_pid.Kd = tune_pid.Kp * Tu / 3;
-                SERIAL_ECHOLNPGM(" Some overshoot");
-                SERIAL_ECHOLNPAIR(" Kp: ", tune_pid.Kp, " Ki: ", tune_pid.Ki, " Kd: ", tune_pid.Kd, " No overshoot");
-                tune_pid.Kp = 0.2 * Ku;
-                tune_pid.Ki = 2 * tune_pid.Kp / Tu;
-                tune_pid.Kd = tune_pid.Kp * Tu / 3;
-                SERIAL_ECHOPAIR(" Kp: ", tune_pid.Kp, " Ki: ", tune_pid.Ki, " Kd: ", tune_pid.Kd);
-                */
-              }
+        if (!heating && current_temp < target && ELAPSED(ms, t1 + 5000UL)) {
+          heating = true;
+          t2 = ms;
+          t_low = t2 - t1;
+          if (cycles > 0) {
+            const long max_pow = GHV(MAX_CHAMBER_POWER, MAX_BED_POWER, PID_MAX);
+            bias += (d * (t_high - t_low)) / (t_low + t_high);
+            LIMIT(bias, 20, max_pow - 20);
+            d = (bias > max_pow >> 1) ? max_pow - 1 - bias : bias;
+
+            SERIAL_ECHOPAIR(STR_BIAS, bias, STR_D_COLON, d, STR_T_MIN, minT, STR_T_MAX, maxT);
+            if (cycles > 2) {
+              const float Ku = (4.0f * d) / (float(M_PI) * (maxT - minT) * 0.5f),
+                          Tu = float(t_low + t_high) * 0.001f,
+                          pf = ischamber ? 0.2f : (isbed ? 0.2f : 0.6f),
+                          df = ischamber ? 1.0f / 3.0f : (isbed ? 1.0f / 3.0f : 1.0f / 8.0f);
+
+              tune_pid.Kp = Ku * pf;
+              tune_pid.Ki = tune_pid.Kp * 2.0f / Tu;
+              tune_pid.Kd = tune_pid.Kp * Tu * df;
+
+              SERIAL_ECHOLNPAIR(STR_KU, Ku, STR_TU, Tu);
+              if (ischamber || isbed)
+                SERIAL_ECHOLNPGM(" No overshoot");
+              else
+                SERIAL_ECHOLNPGM(STR_CLASSIC_PID);
+              SERIAL_ECHOLNPAIR(STR_KP, tune_pid.Kp, STR_KI, tune_pid.Ki, STR_KD, tune_pid.Kd);
             }
-            SHV((bias + d) >> 1, (bias + d) >> 1);
-            cycles++;
-            minT = target;
           }
+          SHV((bias + d) >> 1);
+          cycles++;
+          minT = target;
         }
       }
 
@@ -649,14 +625,14 @@ volatile bool Temperature::raw_temps_ready = false;
       // Report heater states every 2 seconds
       if (ELAPSED(ms, next_temp_ms)) {
         #if HAS_TEMP_SENSOR
-          print_heater_states(isbed ? active_extruder : heater_id);
+          print_heater_states(ischamber ? active_extruder : (isbed ? active_extruder : heater_id));
           SERIAL_EOL();
         #endif
         next_temp_ms = ms + 2000UL;
 
         // Make sure heating is actually working
         #if WATCH_PID
-          if (BOTH(WATCH_BED, WATCH_HOTENDS) || isbed == DISABLED(WATCH_HOTENDS)) {
+          if (BOTH(WATCH_BED, WATCH_HOTENDS) || isbed == DISABLED(WATCH_HOTENDS) || ischamber == DISABLED(WATCH_HOTENDS)) {
             if (!heated) {                                            // If not yet reached target...
               if (current_temp > next_watch_temp) {                   // Over the watch temp?
                 next_watch_temp = current_temp + watch_temp_increase; // - set the next temp to watch for
@@ -686,43 +662,47 @@ volatile bool Temperature::raw_temps_ready = false;
       if (cycles > ncycles && cycles > 2) {
         SERIAL_ECHOLNPGM(STR_PID_AUTOTUNE_FINISHED);
 
-        #if HAS_PID_FOR_BOTH
-          const char * const estring = GHV(PSTR("bed"), NUL_STR);
+        #if EITHER(PIDTEMPBED, PIDTEMPCHAMBER)
+          PGM_P const estring = GHV(PSTR("chamber"), PSTR("bed"), NUL_STR);
           say_default_(); serialprintPGM(estring); SERIAL_ECHOLNPAIR("Kp ", tune_pid.Kp);
           say_default_(); serialprintPGM(estring); SERIAL_ECHOLNPAIR("Ki ", tune_pid.Ki);
           say_default_(); serialprintPGM(estring); SERIAL_ECHOLNPAIR("Kd ", tune_pid.Kd);
-        #elif ENABLED(PIDTEMP)
+        #else
           say_default_(); SERIAL_ECHOLNPAIR("Kp ", tune_pid.Kp);
           say_default_(); SERIAL_ECHOLNPAIR("Ki ", tune_pid.Ki);
           say_default_(); SERIAL_ECHOLNPAIR("Kd ", tune_pid.Kd);
-        #else
-          say_default_(); SERIAL_ECHOLNPAIR("bedKp ", tune_pid.Kp);
-          say_default_(); SERIAL_ECHOLNPAIR("bedKi ", tune_pid.Ki);
-          say_default_(); SERIAL_ECHOLNPAIR("bedKd ", tune_pid.Kd);
         #endif
 
-        #define _SET_BED_PID() do { \
-          temp_bed.pid.Kp = tune_pid.Kp; \
-          temp_bed.pid.Ki = scalePID_i(tune_pid.Ki); \
-          temp_bed.pid.Kd = scalePID_d(tune_pid.Kd); \
-        }while(0)
+        auto _set_hotend_pid = [](const uint8_t e, const PID_t &in_pid) {
+          #if ENABLED(PIDTEMP)
+            PID_PARAM(Kp, e) = in_pid.Kp;
+            PID_PARAM(Ki, e) = scalePID_i(in_pid.Ki);
+            PID_PARAM(Kd, e) = scalePID_d(in_pid.Kd);
+            updatePID();
+          #else
+            UNUSED(e); UNUSED(in_pid);
+          #endif
+        };
 
-        #define _SET_EXTRUDER_PID() do { \
-          PID_PARAM(Kp, heater_id) = tune_pid.Kp; \
-          PID_PARAM(Ki, heater_id) = scalePID_i(tune_pid.Ki); \
-          PID_PARAM(Kd, heater_id) = scalePID_d(tune_pid.Kd); \
-          updatePID(); }while(0)
+        #if ENABLED(PIDTEMPBED)
+          auto _set_bed_pid = [](const PID_t &in_pid) {
+            temp_bed.pid.Kp = in_pid.Kp;
+            temp_bed.pid.Ki = scalePID_i(in_pid.Ki);
+            temp_bed.pid.Kd = scalePID_d(in_pid.Kd);
+          };
+        #endif
+
+        #if ENABLED(PIDTEMPCHAMBER)
+          auto _set_chamber_pid = [](const PID_t &in_pid) {
+            temp_chamber.pid.Kp = in_pid.Kp;
+            temp_chamber.pid.Ki = scalePID_i(in_pid.Ki);
+            temp_chamber.pid.Kd = scalePID_d(in_pid.Kd);
+          };
+        #endif
 
         // Use the result? (As with "M303 U1")
-        if (set_result) {
-          #if HAS_PID_FOR_BOTH
-            if (isbed) _SET_BED_PID(); else _SET_EXTRUDER_PID();
-          #elif ENABLED(PIDTEMP)
-            _SET_EXTRUDER_PID();
-          #else
-            _SET_BED_PID();
-          #endif
-        }
+        if (set_result)
+          GHV(_set_chamber_pid(tune_pid), _set_bed_pid(tune_pid), _set_hotend_pid(heater_id, tune_pid));
 
         TERN_(PRINTER_EVENT_LEDS, printerEventLEDs.onPidTuningDone(color));
 
@@ -939,10 +919,11 @@ void Temperature::min_temp_error(const heater_id_t heater_id) {
   _temp_error(heater_id, PSTR(STR_T_MINTEMP), GET_TEXT(MSG_ERR_MINTEMP));
 }
 
+#if ANY(PID_DEBUG, PID_BED_DEBUG, PID_CHAMBER_DEBUG)
+  bool Temperature::pid_debug_flag; // = 0
+#endif
+
 #if HAS_HOTEND
-  #if ENABLED(PID_DEBUG)
-    extern bool pid_debug_flag;
-  #endif
 
   float Temperature::get_pid_output_hotend(const uint8_t E_NAME) {
     const uint8_t ee = HOTEND_INDEX;
@@ -1023,23 +1004,18 @@ void Temperature::min_temp_error(const heater_id_t heater_id) {
 
       #if ENABLED(PID_DEBUG)
         if (ee == active_extruder && pid_debug_flag) {
-          SERIAL_ECHO_START();
-          SERIAL_ECHOPAIR(STR_PID_DEBUG, ee, STR_PID_DEBUG_INPUT, temp_hotend[ee].celsius, STR_PID_DEBUG_OUTPUT, pid_output);
-          #if DISABLED(PID_OPENLOOP)
-          {
-            SERIAL_ECHOPAIR(
-              STR_PID_DEBUG_PTERM, work_pid[ee].Kp,
-              STR_PID_DEBUG_ITERM, work_pid[ee].Ki,
-              STR_PID_DEBUG_DTERM, work_pid[ee].Kd
+          SERIAL_ECHO_MSG(STR_PID_DEBUG, ee, STR_PID_DEBUG_INPUT, temp_hotend[ee].celsius, STR_PID_DEBUG_OUTPUT, pid_output
+            #if DISABLED(PID_OPENLOOP)
+              , STR_PID_DEBUG_PTERM, work_pid[ee].Kp
+              , STR_PID_DEBUG_ITERM, work_pid[ee].Ki
+              , STR_PID_DEBUG_DTERM, work_pid[ee].Kd
               #if ENABLED(PID_EXTRUSION_SCALING)
                 , STR_PID_DEBUG_CTERM, work_pid[ee].Kc
               #endif
-            );
-          }
-          #endif
-          SERIAL_EOL();
+            #endif
+          );
         }
-      #endif // PID_DEBUG
+      #endif
 
     #else // No PID enabled
 
@@ -1099,13 +1075,76 @@ void Temperature::min_temp_error(const heater_id_t heater_id) {
     #endif // PID_OPENLOOP
 
     #if ENABLED(PID_BED_DEBUG)
+      if (pid_debug_flag) {
+        SERIAL_ECHO_MSG(
+          " PID_BED_DEBUG : Input ", temp_bed.celsius, " Output ", pid_output
+          #if DISABLED(PID_OPENLOOP)
+            , STR_PID_DEBUG_PTERM, work_pid.Kp
+            , STR_PID_DEBUG_ITERM, work_pid.Ki
+            , STR_PID_DEBUG_DTERM, work_pid.Kd
+          #endif
+        );
+      }
+    #endif
+
+    return pid_output;
+  }
+
+#endif // PIDTEMPBED
+
+#if ENABLED(PIDTEMPCHAMBER)
+
+  float Temperature::get_pid_output_chamber() {
+
+    #if DISABLED(PID_OPENLOOP)
+
+      static PID_t work_pid{0};
+      static float temp_iState = 0, temp_dState = 0;
+      static bool pid_reset = true;
+      float pid_output = 0;
+      const float max_power_over_i_gain = float(MAX_CHAMBER_POWER) / temp_chamber.pid.Ki - float(MIN_CHAMBER_POWER),
+                  pid_error = temp_chamber.target - temp_chamber.celsius;
+
+      if (!temp_chamber.target || pid_error < -(PID_FUNCTIONAL_RANGE)) {
+        pid_output = 0;
+        pid_reset = true;
+      }
+      else if (pid_error > PID_FUNCTIONAL_RANGE) {
+        pid_output = MAX_CHAMBER_POWER;
+        pid_reset = true;
+      }
+      else {
+        if (pid_reset) {
+          temp_iState = 0.0;
+          work_pid.Kd = 0.0;
+          pid_reset = false;
+        }
+
+        temp_iState = constrain(temp_iState + pid_error, 0, max_power_over_i_gain);
+
+        work_pid.Kp = temp_chamber.pid.Kp * pid_error;
+        work_pid.Ki = temp_chamber.pid.Ki * temp_iState;
+        work_pid.Kd = work_pid.Kd + PID_K2 * (temp_chamber.pid.Kd * (temp_dState - temp_chamber.celsius) - work_pid.Kd);
+
+        temp_dState = temp_chamber.celsius;
+
+        pid_output = constrain(work_pid.Kp + work_pid.Ki + work_pid.Kd + float(MIN_CHAMBER_POWER), 0, MAX_CHAMBER_POWER);
+      }
+
+    #else // PID_OPENLOOP
+
+      const float pid_output = constrain(temp_chamber.target, 0, MAX_CHAMBER_POWER);
+
+    #endif // PID_OPENLOOP
+
+    #if ENABLED(PID_CHAMBER_DEBUG)
     {
       SERIAL_ECHO_MSG(
-        " PID_BED_DEBUG : Input ", temp_bed.celsius, " Output ", pid_output,
+        " PID_CHAMBER_DEBUG : Input ", temp_chamber.celsius, " Output ", pid_output
         #if DISABLED(PID_OPENLOOP)
-          STR_PID_DEBUG_PTERM, work_pid.Kp,
-          STR_PID_DEBUG_ITERM, work_pid.Ki,
-          STR_PID_DEBUG_DTERM, work_pid.Kd,
+          , STR_PID_DEBUG_PTERM, work_pid.Kp
+          , STR_PID_DEBUG_ITERM, work_pid.Ki
+          , STR_PID_DEBUG_DTERM, work_pid.Kd
         #endif
       );
     }
@@ -1114,7 +1153,7 @@ void Temperature::min_temp_error(const heater_id_t heater_id) {
     return pid_output;
   }
 
-#endif // PIDTEMPBED
+#endif // PIDTEMPCHAMBER
 
 /**
  * Manage heating activities for extruder hot-ends and a heated bed
@@ -1363,42 +1402,47 @@ void Temperature::manage_heater() {
       }
     #endif
 
+
+
+
+    #if ENABLED(PIDTEMPCHAMBER)
+      // PIDTEMPCHAMBER doens't support a CHAMBER_VENT yet.
+      temp_chamber.soft_pwm_amount = WITHIN(temp_chamber.celsius, CHAMBER_MINTEMP, CHAMBER_MAXTEMP) ? (int)get_pid_output_chamber() >> 1 : 0;
+    #else
     if (ELAPSED(ms, next_chamber_check_ms)) {
       next_chamber_check_ms = ms + CHAMBER_CHECK_INTERVAL;
 
       if (WITHIN(temp_chamber.celsius, CHAMBER_MINTEMP, CHAMBER_MAXTEMP)) {
-        if (flag_chamber_excess_heat) {
-          temp_chamber.soft_pwm_amount = 0;
-          #if ENABLED(CHAMBER_VENT)
-            if (!flag_chamber_off) MOVE_SERVO(CHAMBER_VENT_SERVO_NR, temp_chamber.celsius <= temp_chamber.target ? 0 : 90);
-          #endif
+          if (flag_chamber_excess_heat) {
+            temp_chamber.soft_pwm_amount = 0;
+            #if ENABLED(CHAMBER_VENT)
+              if (!flag_chamber_off) MOVE_SERVO(CHAMBER_VENT_SERVO_NR, temp_chamber.celsius <= temp_chamber.target ? 0 : 90);
+            #endif
+          }
+          else {
+            #if ENABLED(CHAMBER_LIMIT_SWITCHING)
+              if (temp_chamber.celsius >= temp_chamber.target + TEMP_CHAMBER_HYSTERESIS)
+                temp_chamber.soft_pwm_amount = 0;
+              else if (temp_chamber.celsius <= temp_chamber.target - (TEMP_CHAMBER_HYSTERESIS))
+                temp_chamber.soft_pwm_amount = (MAX_CHAMBER_POWER) >> 1;
+            #else
+              temp_chamber.soft_pwm_amount = temp_chamber.celsius < temp_chamber.target ? (MAX_CHAMBER_POWER) >> 1 : 0;
+            #endif
+            #if ENABLED(CHAMBER_VENT)
+              if (!flag_chamber_off) MOVE_SERVO(CHAMBER_VENT_SERVO_NR, 0);
+            #endif
+          }
         }
         else {
-          #if ENABLED(CHAMBER_LIMIT_SWITCHING)
-            if (temp_chamber.celsius >= temp_chamber.target + TEMP_CHAMBER_HYSTERESIS)
-              temp_chamber.soft_pwm_amount = 0;
-            else if (temp_chamber.celsius <= temp_chamber.target - (TEMP_CHAMBER_HYSTERESIS))
-              temp_chamber.soft_pwm_amount = (MAX_CHAMBER_POWER) >> 1;
-          #else
-            temp_chamber.soft_pwm_amount = temp_chamber.celsius < temp_chamber.target ? (MAX_CHAMBER_POWER) >> 1 : 0;
-          #endif
-          #if ENABLED(CHAMBER_VENT)
-            if (!flag_chamber_off) MOVE_SERVO(CHAMBER_VENT_SERVO_NR, 0);
-          #endif
+          temp_chamber.soft_pwm_amount = 0;
+          WRITE_HEATER_CHAMBER(LOW);
         }
-      }
-      else {
-        temp_chamber.soft_pwm_amount = 0;
-        WRITE_HEATER_CHAMBER(LOW);
-      }
-
-      #if ENABLED(THERMAL_PROTECTION_CHAMBER)
-        tr_state_machine[RUNAWAY_IND_CHAMBER].run(temp_chamber.celsius, temp_chamber.target, H_CHAMBER, THERMAL_PROTECTION_CHAMBER_PERIOD, THERMAL_PROTECTION_CHAMBER_HYSTERESIS);
-      #endif
-    }
 
-    // TODO: Implement true PID pwm
-    //temp_bed.soft_pwm_amount = WITHIN(temp_chamber.celsius, CHAMBER_MINTEMP, CHAMBER_MAXTEMP) ? (int)get_pid_output_chamber() >> 1 : 0;
+     }
+     #if ENABLED(THERMAL_PROTECTION_CHAMBER)
+       tr_state_machine[RUNAWAY_IND_CHAMBER].run(temp_chamber.celsius, temp_chamber.target, H_CHAMBER, THERMAL_PROTECTION_CHAMBER_PERIOD, THERMAL_PROTECTION_CHAMBER_HYSTERESIS);
+     #endif
+   #endif
 
   #endif // HAS_HEATED_CHAMBER
 

Marlin/src/module/temperature.h

@@ -210,7 +210,11 @@ struct PIDHeaterInfo : public HeaterInfo {
   typedef temp_info_t probe_info_t;
 #endif
 #if HAS_HEATED_CHAMBER
-  typedef heater_info_t chamber_info_t;
+  #if ENABLED(PIDTEMPCHAMBER)
+    typedef struct PIDHeaterInfo<PID_t> chamber_info_t;
+  #else
+    typedef heater_info_t chamber_info_t;
+  #endif
 #elif HAS_TEMP_CHAMBER
   typedef temp_info_t chamber_info_t;
 #endif
@@ -415,7 +419,7 @@ class Temperature {
 
     #if HAS_HEATED_CHAMBER
       TERN_(WATCH_CHAMBER, static chamber_watch_t watch_chamber);
-      static millis_t next_chamber_check_ms;
+      TERN(PIDTEMPCHAMBER,,static millis_t next_chamber_check_ms);
       #ifdef CHAMBER_MINTEMP
         static int16_t mintemp_raw_CHAMBER;
       #endif
@@ -751,6 +755,11 @@ class Temperature {
      * Perform auto-tuning for hotend or bed in response to M303
      */
     #if HAS_PID_HEATING
+
+      #if ANY(PID_DEBUG, PID_BED_DEBUG, PID_CHAMBER_DEBUG)
+        static bool pid_debug_flag;
+      #endif
+
       static void PID_autotune(const float &target, const heater_id_t heater_id, const int8_t ncycles, const bool set_result=false);
 
       #if ENABLED(NO_FAN_SLOWING_IN_PID_TUNING)
@@ -826,11 +835,9 @@ class Temperature {
 
     static void checkExtruderAutoFans();
 
-    static float get_pid_output_hotend(const uint8_t e);
-
-    TERN_(PIDTEMPBED, static float get_pid_output_bed());
-
-    TERN_(HAS_HEATED_CHAMBER, static float get_pid_output_chamber());
+    TERN_(HAS_HOTEND,     static float get_pid_output_hotend(const uint8_t e));
+    TERN_(PIDTEMPBED,     static float get_pid_output_bed());
+    TERN_(PIDTEMPCHAMBER, static float get_pid_output_chamber());
 
     static void _temp_error(const heater_id_t e, PGM_P const serial_msg, PGM_P const lcd_msg);
     static void min_temp_error(const heater_id_t e);