Laser Coolant Flow Meter / Safety Shutdown (#21431)

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

Marlin/Configuration_adv.h

@@ -204,6 +204,20 @@
   #endif
 #endif
 
+//
+// Laser Coolant Flow Meter
+//
+//#define LASER_COOLANT_FLOW_METER
+#if ENABLED(LASER_COOLANT_FLOW_METER)
+  #define FLOWMETER_PIN         20  // Requires an external interrupt-enabled pin (e.g., RAMPS 2,3,18,19,20,21)
+  #define FLOWMETER_PPL       5880  // (pulses/liter) Flow meter pulses-per-liter on the input pin
+  #define FLOWMETER_INTERVAL  1000  // (ms) Flow rate calculation interval in milliseconds
+  #define FLOWMETER_SAFETY          // Prevent running the laser without the minimum flow rate set below
+  #if ENABLED(FLOWMETER_SAFETY)
+    #define FLOWMETER_MIN_LITERS_PER_MINUTE 1.5 // (liters/min) Minimum flow required when enabled
+  #endif
+#endif
+
 /**
  * Thermal Protection provides additional protection to your printer from damage
  * and fire. Marlin always includes safe min and max temperature ranges which
@@ -1539,6 +1553,7 @@
   #define STATUS_CHAMBER_ANIM         // Use a second bitmap to indicate chamber heating
   //#define STATUS_CUTTER_ANIM        // Use a second bitmap to indicate spindle / laser active
   //#define STATUS_COOLER_ANIM        // Use a second bitmap to indicate laser cooling
+  //#define STATUS_FLOWMETER_ANIM     // Use multiple bitmaps to indicate coolant flow
   //#define STATUS_ALT_BED_BITMAP     // Use the alternative bed bitmap
   //#define STATUS_ALT_FAN_BITMAP     // Use the alternative fan bitmap
   //#define STATUS_FAN_FRAMES 3       // :[0,1,2,3,4] Number of fan animation frames

Marlin/src/core/language.h

@@ -130,6 +130,7 @@
 #define STR_COUNT_A                         " Count A:"
 #define STR_WATCHDOG_FIRED                  "Watchdog timeout. Reset required."
 #define STR_ERR_KILLED                      "Printer halted. kill() called!"
+#define STR_FLOWMETER_FAULT                 "Coolant flow fault. Flowmeter safety is active. Attention required."
 #define STR_ERR_STOPPED                     "Printer stopped due to errors. Fix the error and use M999 to restart. (Temperature is reset. Set it after restarting)"
 #define STR_ERR_SERIAL_MISMATCH             "Serial status mismatch"
 #define STR_BUSY_PROCESSING                 "busy: processing"

Marlin/src/feature/cooler.cpp

@@ -27,11 +27,21 @@
 #include "cooler.h"
 Cooler cooler;
 
-uint16_t Cooler::flowrate;        // Flow meter reading in liters, 0 will result in shutdown if equiped
+uint8_t Cooler::mode = 0;
-uint8_t Cooler::mode = 0;         // 0 = CO2 Liquid cooling, 1 = Laser Diode TEC Heatsink Cooling
+uint16_t Cooler::capacity;
-uint16_t Cooler::capacity;        // Cooling capacity in watts
+uint16_t Cooler::load;
-uint16_t Cooler::load;            // Cooling load in watts
+bool Cooler::enabled = false;
-bool Cooler::flowmeter = false;
-bool Cooler::state = false;       // on = true, off = false
 
+#if ENABLED(LASER_COOLANT_FLOW_METER)
+  bool Cooler::flowmeter = false;
+  millis_t Cooler::flowmeter_next_ms; // = 0
+  volatile uint16_t Cooler::flowpulses;
+  float Cooler::flowrate;
 #endif
+
+#if ENABLED(FLOWMETER_SAFETY)
+  bool Cooler::flowsafety_enabled = true;
+  bool Cooler::fault = false;
+#endif
+
+#endif // HAS_COOLER

Marlin/src/feature/cooler.h

@@ -21,30 +21,91 @@
  */
 #pragma once
 
-#include <stdint.h>
+#include "../inc/MarlinConfigPre.h"
 
-#define _MSG_COOLER(M) MSG_COOLER_##M
+#ifndef FLOWMETER_PPL
-#define MSG_COOLER(M) _MSG_COOLER(M)
+  #define FLOWMETER_PPL      5880 // Pulses per liter
+#endif
+#ifndef FLOWMETER_INTERVAL
+  #define FLOWMETER_INTERVAL 1000 // milliseconds
+#endif
 
 // Cooling device
 
 class Cooler {
 public:
-  static uint16_t flowrate;        // Flow meter reading in liters, 0 will result in shutdown if equiped
-  static uint8_t mode;             // 0 = CO2 Liquid cooling, 1 = Laser Diode TEC Heatsink Cooling
   static uint16_t capacity;   // Cooling capacity in watts
   static uint16_t load;       // Cooling load in watts
-  static bool flowmeter;
-  static bool state;               // on = true, off = false
 
-  static bool is_enabled()                    { return state; }
+  static bool enabled;
-  static void enable()                        { state = true; }
+  static void enable()  { enabled = true; }
-  static void disable()                       { state = false; }
+  static void disable() { enabled = false; }
+  static void toggle()  { enabled = !enabled; }
+
+  static uint8_t mode;                  // 0 = CO2 Liquid cooling, 1 = Laser Diode TEC Heatsink Cooling
   static void set_mode(const uint8_t m) { mode = m; }
-  static void set_flowmeter(const bool sflag) { flowmeter = sflag; }
+
-  static uint16_t get_flowrate()              { return flowrate; }
+  #if ENABLED(LASER_COOLANT_FLOW_METER)
-  static void update_flowrate(uint16_t flow)  { flowrate = flow; }
+    static float flowrate;                // Flow meter reading in liters-per-minute.
-  //static void init() { set_state(false); }
+    static bool flowmeter;                // Flag to monitor the flow
+    static volatile uint16_t flowpulses;  // Flowmeter IRQ pulse count
+    static millis_t flowmeter_next_ms;    // Next time at which to calculate flow
+
+    static void set_flowmeter(const bool sflag) {
+      if (flowmeter != sflag) {
+        flowmeter = sflag;
+        if (sflag) {
+          flowpulses = 0;
+          flowmeter_next_ms = millis() + FLOWMETER_INTERVAL;
+        }
+      }
+    }
+
+    // To calculate flow we only need to count pulses
+    static void flowmeter_ISR() { flowpulses++; }
+
+    // Enable / Disable the flow meter interrupt
+    static void flowmeter_interrupt_enable() {
+      attachInterrupt(digitalPinToInterrupt(FLOWMETER_PIN), flowmeter_ISR, RISING);
+    }
+    static void flowmeter_interrupt_disable() {
+      detachInterrupt(digitalPinToInterrupt(FLOWMETER_PIN));
+    }
+
+    // Enable / Disable the flow meter interrupt
+    static void flowmeter_enable()  { set_flowmeter(true); flowpulses = 0; flowmeter_interrupt_enable(); }
+    static void flowmeter_disable() { set_flowmeter(false); flowmeter_interrupt_disable(); flowpulses = 0; }
+
+    // Get the total flow (in liters per minute) since the last reading
+    static void calc_flowrate() {
+      //flowmeter_interrupt_disable();
+      //  const uint16_t pulses = flowpulses;
+      //flowmeter_interrupt_enable();
+      flowrate = flowpulses * 60.0f * (1000.0f / (FLOWMETER_INTERVAL)) * (1000.0f / (FLOWMETER_PPL));
+      flowpulses = 0;
+    }
+
+    // Userland task to update the flow meter
+    static void flowmeter_task(const millis_t ms=millis()) {
+      if (!flowmeter)       // !! The flow meter must always be on !!
+        flowmeter_enable(); // Init and prime
+      if (ELAPSED(ms, flowmeter_next_ms)) {
+        calc_flowrate();
+        flowmeter_next_ms = ms + FLOWMETER_INTERVAL;
+      }
+    }
+
+    #if ENABLED(FLOWMETER_SAFETY)
+      static bool fault;                // Flag that the cooler is in a fault state
+      static bool flowsafety_enabled;   // Flag to disable the cutter if flow rate is too low
+      static void flowsafety_toggle()   { flowsafety_enabled = !flowsafety_enabled; }
+      static bool check_flow_too_low() {
+        const bool too_low = flowsafety_enabled && flowrate < (FLOWMETER_MIN_LITERS_PER_MINUTE);
+        if (too_low) fault = true;
+        return too_low;
+      }
+    #endif
+  #endif
 };
 
 extern Cooler cooler;

Marlin/src/feature/spindle_laser.h

@@ -215,7 +215,6 @@ public:
   static inline void disable() { isReady = false; set_enabled(false); }
 
   #if HAS_LCD_MENU
-
       static inline void enable_with_dir(const bool reverse) {
       isReady = true;
       const uint8_t ocr = TERN(SPINDLE_LASER_PWM, upower_to_ocr(menuPower), 255);
@@ -245,8 +244,8 @@ public:
        * If not set defaults to 80% power
        */
       static inline void test_fire_pulse() {
-        enable_forward();                  // Turn Laser on (Spindle speak but same funct)
         TERN_(USE_BEEPER, buzzer.tone(30, 3000));
+        enable_forward();                  // Turn Laser on (Spindle speak but same funct)
         delay(testPulse);                  // Delay for time set by user in pulse ms menu screen.
         disable();                         // Turn laser off
       }

Marlin/src/gcode/gcode.cpp

@@ -57,6 +57,10 @@ GcodeSuite gcode;
   #include "../feature/spindle_laser.h"
 #endif
 
+#if ENABLED(FLOWMETER_SAFETY)
+  #include "../feature/cooler.h"
+#endif
+
 #if ENABLED(PASSWORD_FEATURE)
   #include "../feature/password/password.h"
 #endif
@@ -278,6 +282,13 @@ void GcodeSuite::process_parsed_command(const bool no_ok/*=false*/) {
     }
   #endif
 
+  #if ENABLED(FLOWMETER_SAFETY)
+    if (cooler.fault) {
+      SERIAL_ECHO_MSG(STR_FLOWMETER_FAULT);
+      return;
+    }
+  #endif
+
   // Handle a known G, M, or T
   switch (parser.command_letter) {
     case 'G': switch (parser.codenum) {

Marlin/src/inc/SanityCheck.h

@@ -1895,6 +1895,10 @@ static_assert(hbm[Z_AXIS] >= 0, "HOMING_BUMP_MM.Z must be greater than or equal
   #error "TEMP_SENSOR_COOLER requires LASER_FEATURE and TEMP_COOLER_PIN."
 #endif
 
+#if ENABLED(LASER_COOLANT_FLOW_METER) && !(PIN_EXISTS(FLOWMETER) && ENABLED(LASER_FEATURE))
+  #error "LASER_COOLANT_FLOW_METER requires FLOWMETER_PIN and LASER_FEATURE."
+#endif
+
 #if ENABLED(CHAMBER_FAN) && !(defined(CHAMBER_FAN_MODE) && WITHIN(CHAMBER_FAN_MODE, 0, 2))
   #error "CHAMBER_FAN_MODE must be between 0 and 2."
 #endif

Marlin/src/lcd/HD44780/marlinui_HD44780.cpp

@@ -46,6 +46,10 @@
   #include "../../gcode/parser.h"
 #endif
 
+#if HAS_COOLER || HAS_FLOWMETER
+  #include "../../feature/cooler.h"
+#endif
+
 #if ENABLED(AUTO_BED_LEVELING_UBL)
   #include "../../feature/bedlevel/bedlevel.h"
 #endif
@@ -517,6 +521,7 @@ FORCE_INLINE void _draw_axis_value(const AxisEnum axis, const char *value, const
     lcd_put_u8str(value);
 }
 
+
 FORCE_INLINE void _draw_heater_status(const heater_id_t heater_id, const char prefix, const bool blink) {
   #if HAS_HEATED_BED
     const bool isBed = TERN(HAS_HEATED_CHAMBER, heater_id == H_BED, heater_id < 0);
@@ -550,6 +555,43 @@ FORCE_INLINE void _draw_heater_status(const heater_id_t heater_id, const char pr
   }
 }
 
+#if HAS_COOLER
+FORCE_INLINE void _draw_cooler_status(const char prefix, const bool blink) {
+  const float t1 = thermalManager.degCooler(), t2 = thermalManager.degTargetCooler();
+
+  if (prefix >= 0) lcd_put_wchar(prefix);
+
+  lcd_put_u8str(i16tostr3rj(t1 + 0.5));
+  lcd_put_wchar('/');
+
+  #if !HEATER_IDLE_HANDLER
+    UNUSED(blink);
+  #else
+    if (!blink && thermalManager.heater_idle[thermalManager.idle_index_for_id(heater_id)].timed_out) {
+      lcd_put_wchar(' ');
+      if (t2 >= 10) lcd_put_wchar(' ');
+      if (t2 >= 100) lcd_put_wchar(' ');
+    }
+    else
+  #endif
+      lcd_put_u8str(i16tostr3left(t2 + 0.5));
+
+  if (prefix >= 0) {
+    lcd_put_wchar(LCD_STR_DEGREE[0]);
+    lcd_put_wchar(' ');
+    if (t2 < 10) lcd_put_wchar(' ');
+  }
+}
+#endif
+
+#if HAS_FLOWMETER
+  FORCE_INLINE void _draw_flowmeter_status() {
+    lcd_put_u8str("~ ");
+    lcd_put_u8str(ftostr11ns(cooler.flowrate));
+    lcd_put_wchar('L');
+  }
+#endif
+
 FORCE_INLINE void _draw_bed_status(const bool blink) {
   _draw_heater_status(H_BED, TERN0(HAS_LEVELING, blink && planner.leveling_active) ? '_' : LCD_STR_BEDTEMP[0], blink);
 }
@@ -747,6 +789,7 @@ void MarlinUI::draw_status_screen() {
       //
       // Hotend 0 Temperature
       //
+      #if HAS_HOTEND
         _draw_heater_status(H_E0, -1, blink);
 
         //
@@ -759,12 +802,14 @@ void MarlinUI::draw_status_screen() {
           lcd_moveto(8, 0);
           _draw_bed_status(blink);
         #endif
+      #endif
 
     #else // LCD_WIDTH >= 20
 
       //
       // Hotend 0 Temperature
       //
+      #if HAS_HOTEND
         _draw_heater_status(H_E0, LCD_STR_THERMOMETER[0], blink);
 
         //
@@ -777,6 +822,14 @@ void MarlinUI::draw_status_screen() {
           lcd_moveto(10, 0);
           _draw_bed_status(blink);
         #endif
+      #endif
+
+      #if HAS_COOLER
+        _draw_cooler_status('*', blink);
+      #endif
+      #if HAS_FLOWMETER
+        _draw_flowmeter_status();
+      #endif
 
     #endif // LCD_WIDTH >= 20
 

Marlin/src/lcd/dogm/dogm_Statusscreen.h

@@ -77,9 +77,12 @@
 #ifndef STATUS_CUTTER_WIDTH
   #define STATUS_CUTTER_WIDTH 0
 #endif
+  #ifndef STATUS_CUTTER_BYTEWIDTH
+    #define STATUS_CUTTER_BYTEWIDTH BW(STATUS_CUTTER_WIDTH)
+  #endif
 
 //
-// Laser Cooler
+// Laser cooler
 //
 #if !STATUS_COOLER_WIDTH && HAS_COOLER
   #include "status/cooler.h"
@@ -87,6 +90,24 @@
 #ifndef STATUS_COOLER_WIDTH
   #define STATUS_COOLER_WIDTH 0
 #endif
+#ifndef STATUS_COOLER_BYTEWIDTH
+  #define STATUS_COOLER_BYTEWIDTH BW(STATUS_COOLER_WIDTH)
+#endif
+
+//
+// Laser Flowmeter
+//
+#if !STATUS_FLOWMETER_WIDTH && HAS_FLOWMETER
+  #include "status/cooler.h"
+#endif
+#ifndef STATUS_FLOWMETER_WIDTH
+  #define STATUS_FLOWMETER_WIDTH 0
+#endif
+#ifndef STATUS_FLOWMETER_BYTEWIDTH
+  #define STATUS_FLOWMETER_BYTEWIDTH BW(STATUS_FLOWMETER_WIDTH)
+#endif
+
+
 
 //
 // Bed
@@ -425,10 +446,8 @@
 //
 // Cutter Bitmap Properties
 //
-#ifndef STATUS_CUTTER_BYTEWIDTH
+#if HAS_CUTTER
-  #define STATUS_CUTTER_BYTEWIDTH BW(STATUS_CUTTER_WIDTH)
+  #if STATUS_CUTTER_WIDTH
-#endif
-#if STATUS_CUTTER_WIDTH
 
     #ifndef STATUS_CUTTER_X
       #define STATUS_CUTTER_X (LCD_PIXEL_WIDTH - (STATUS_CUTTER_BYTEWIDTH + STATUS_CUTTER_BYTEWIDTH) * 8)
@@ -465,6 +484,7 @@
       );
     #endif
 
+  #endif
 #endif
 
 //
@@ -511,21 +531,15 @@
 //
 // Cooler Bitmap Properties
 //
-#ifndef STATUS_COOLER_BYTEWIDTH
+#if HAS_COOLER
-  #define STATUS_COOLER_BYTEWIDTH BW(STATUS_COOLER_WIDTH)
+  #if STATUS_COOLER_WIDTH
-#endif
-#if STATUS_COOLER_WIDTH
 
     #ifndef STATUS_COOLER_X
       #define STATUS_COOLER_X (LCD_PIXEL_WIDTH - (STATUS_COOLER_BYTEWIDTH + STATUS_FAN_BYTEWIDTH + STATUS_CUTTER_BYTEWIDTH) * 8)
     #endif
 
     #ifndef STATUS_COOLER_HEIGHT
-    #ifdef STATUS_COOLER_ANIM
+      #define STATUS_COOLER_HEIGHT(S) (sizeof(status_cooler_bmp1) / (STATUS_COOLER_BYTEWIDTH))
-      #define STATUS_COOLER_HEIGHT(S) ((S) ? sizeof(status_cooler_on_bmp) / (STATUS_COOLER_BYTEWIDTH) : sizeof(status_cooler_bmp) / (STATUS_COOLER_BYTEWIDTH))
-    #else
-      #define STATUS_COOLER_HEIGHT(S) (sizeof(status_cooler_bmp) / (STATUS_COOLER_BYTEWIDTH))
-    #endif
     #endif
 
     #ifndef STATUS_COOLER_Y
@@ -537,16 +551,52 @@
     #endif
 
     static_assert(
-    sizeof(status_cooler_bmp) == (STATUS_COOLER_BYTEWIDTH) * (STATUS_COOLER_HEIGHT(0)),
+      sizeof(status_cooler_bmp1) == (STATUS_COOLER_BYTEWIDTH) * (STATUS_COOLER_HEIGHT(0)),
-    "Status cooler bitmap (status_cooler_bmp) dimensions don't match data."
+      "Status cooler bitmap (status_cooler_bmp1) dimensions don't match data."
     );
     #ifdef STATUS_COOLER_ANIM
       static_assert(
-      sizeof(status_cooler_on_bmp) == (STATUS_COOLER_BYTEWIDTH) * (STATUS_COOLER_HEIGHT(1)),
+        sizeof(status_cooler_bmp2) == (STATUS_COOLER_BYTEWIDTH) * (STATUS_COOLER_HEIGHT(1)),
-      "Status cooler bitmap (status_cooler_on_bmp) dimensions don't match data."
+        "Status cooler bitmap (status_cooler_bmp2) dimensions don't match data."
       );
     #endif
 
+  #endif
+#endif
+
+//
+//  Flowmeter Bitmap Properties
+//
+#if HAS_FLOWMETER
+  #if STATUS_FLOWMETER_WIDTH
+
+    #ifndef STATUS_FLOWMETER_X
+      #define STATUS_FLOWMETER_X (LCD_PIXEL_WIDTH - (STATUS_FLOWMETER_BYTEWIDTH + STATUS_FAN_BYTEWIDTH + STATUS_CUTTER_BYTEWIDTH + STATUS_COOLER_BYTEWIDTH) * 8)
+    #endif
+
+    #ifndef STATUS_FLOWMETER_HEIGHT
+      #define STATUS_FLOWMETER_HEIGHT(S) (sizeof(status_flowmeter_bmp1) / (STATUS_FLOWMETER_BYTEWIDTH))
+    #endif
+
+    #ifndef STATUS_FLOWMETER_Y
+      #define STATUS_FLOWMETER_Y(S) (20 - STATUS_FLOWMETER_HEIGHT(S))
+    #endif
+
+    #ifndef STATUS_FLOWMETER_TEXT_X
+      #define STATUS_FLOWMETER_TEXT_X (STATUS_FLOWMETER_X + 8)
+    #endif
+
+    static_assert(
+      sizeof(status_flowmeter_bmp1) == (STATUS_FLOWMETER_BYTEWIDTH) * STATUS_FLOWMETER_HEIGHT(0),
+      "Status flowmeter bitmap (status_flowmeter_bmp1) dimensions don't match data."
+    );
+    #ifdef STATUS_COOLER_ANIM
+      static_assert(
+        sizeof(status_flowmeter_bmp2) == (STATUS_FLOWMETER_BYTEWIDTH) * STATUS_FLOWMETER_HEIGHT(1),
+        "Status flowmeter bitmap (status_flowmeter_bmp2) dimensions don't match data."
+      );
+    #endif
+  #endif
 #endif
 
 //
@@ -639,6 +689,9 @@
 #if HAS_COOLER
   #define DO_DRAW_COOLER 1
 #endif
+#if HAS_FLOWMETER
+  #define DO_DRAW_FLOWMETER 1
+#endif
 
 #if HAS_TEMP_CHAMBER && STATUS_CHAMBER_WIDTH && HOTENDS <= 4
   #define DO_DRAW_CHAMBER 1
@@ -661,6 +714,9 @@
 #if BOTH(DO_DRAW_COOLER, STATUS_COOLER_ANIM)
   #define ANIM_COOLER 1
 #endif
+#if BOTH(DO_DRAW_FLOWMETER, STATUS_FLOWMETER_ANIM)
+  #define ANIM_FLOWMETER 1
+#endif
 #if ANIM_HOTEND || ANIM_BED || ANIM_CHAMBER || ANIM_CUTTER
   #define ANIM_HBCC 1
 #endif

Marlin/src/lcd/dogm/status/cooler.h

@@ -24,12 +24,9 @@
 //
 // lcd/dogm/status/cooler.h - Status Screen Laser Cooler bitmaps
 //
-
+#if HAS_COOLER
-#define STATUS_COOLER_WIDTH 16
+  #define STATUS_COOLER_WIDTH 16
-
+  const unsigned char status_cooler_bmp2[] PROGMEM = {
-#ifdef STATUS_COOLER_ANIM
-
-  const unsigned char status_cooler_on_bmp[] PROGMEM = {
     B00010000,B00001000,
     B00010010,B01001001,
     B01010100,B00101010,
@@ -47,10 +44,7 @@
     B00000010,B10100000,
     B00000100,B10010000
   };
-
+  const unsigned char status_cooler_bmp1[] PROGMEM = {
-#endif
-
-const unsigned char status_cooler_bmp[] PROGMEM = {
     B00010000,B00001000,
     B00010010,B01001001,
     B01010100,B00101010,
@@ -67,4 +61,54 @@ const unsigned char status_cooler_bmp[] PROGMEM = {
     B00000001,B01000000,
     B00000010,B10100000,
     B00000100,B10010000
-};
+  };
+#endif
+
+#if HAS_FLOWMETER
+  #define STATUS_FLOWMETER_WIDTH 24
+  const unsigned char status_flowmeter_bmp2[] PROGMEM = {
+    B00000001,B11111000,B00000000,
+    B00000110,B00000110,B00000000,
+    B00001000,B01100001,B00000000,
+    B00010000,B01100000,B10000000,
+    B00100000,B01100000,B01000000,
+    B00100000,B01100000,B01000000,
+    B01000000,B01100000,B00100000,
+    B01000000,B01100000,B00100000,
+    B01011111,B11111111,B10100000,
+    B01011111,B11111111,B10100000,
+    B01000000,B01100000,B00100000,
+    B01000000,B01100000,B00100000,
+    B00100000,B01100000,B01000000,
+    B00100000,B01100000,B01000000,
+    B00010000,B01100000,B10000000,
+    B00001000,B01100001,B00000000,
+    B00000110,B00000110,B00000000,
+    B00000001,B11111000,B00000000,
+    B00000000,B01100000,B00000000,
+    B00011111,B11111111,B10000000
+  };
+  const unsigned char status_flowmeter_bmp1[] PROGMEM = {
+    B00000001,B11111000,B00000000,
+    B00000110,B00000110,B00000000,
+    B00001000,B00000001,B00000000,
+    B00010100,B00000010,B10000000,
+    B00101110,B00000111,B01000000,
+    B00100111,B00001110,B01000000,
+    B01000011,B10011100,B00100000,
+    B01000001,B11111000,B00100000,
+    B01000000,B11110000,B00100000,
+    B01000000,B11110000,B00100000,
+    B01000001,B11111000,B00100000,
+    B01000011,B10011100,B00100000,
+    B00100111,B00001110,B01000000,
+    B00101110,B00000111,B01000000,
+    B00010100,B00000010,B10000000,
+    B00001000,B00000001,B00000000,
+    B00000110,B00000110,B00000000,
+    B00000001,B11111000,B00000000,
+    B00000000,B01100000,B00000000,
+    B00011111,B11111111,B10000000
+  };
+#endif
+

Marlin/src/lcd/dogm/status_screen_DOGM.cpp

@@ -53,6 +53,10 @@
   #include "../../feature/spindle_laser.h"
 #endif
 
+#if HAS_COOLER || HAS_FLOWMETER
+  #include "../../feature/cooler.h"
+#endif
+
 #if HAS_POWER_MONITOR
   #include "../../feature/power_monitor.h"
 #endif
@@ -83,40 +87,34 @@
 
 #if ANIM_HBCC
   enum HeatBits : uint8_t {
-    HEATBIT_HOTEND,
+    DRAWBIT_HOTEND,
-    HEATBIT_BED = HOTENDS,
+    DRAWBIT_BED = HOTENDS,
-    HEATBIT_CHAMBER,
+    DRAWBIT_CHAMBER,
-    HEATBIT_COOLER,
+    DRAWBIT_CUTTER
-    HEATBIT_CUTTER
   };
-  IF<(HEATBIT_CUTTER > 7), uint16_t, uint8_t>::type heat_bits;
+  IF<(DRAWBIT_CUTTER > 7), uint16_t, uint8_t>::type draw_bits;
 #endif
 
 #if ANIM_HOTEND
-  #define HOTEND_ALT(N) TEST(heat_bits, HEATBIT_HOTEND + N)
+  #define HOTEND_ALT(N) TEST(draw_bits, DRAWBIT_HOTEND + N)
 #else
   #define HOTEND_ALT(N) false
 #endif
 #if ANIM_BED
-  #define BED_ALT() TEST(heat_bits, HEATBIT_BED)
+  #define BED_ALT() TEST(draw_bits, DRAWBIT_BED)
 #else
   #define BED_ALT() false
 #endif
 #if ANIM_CHAMBER
-  #define CHAMBER_ALT() TEST(heat_bits, HEATBIT_CHAMBER)
+  #define CHAMBER_ALT() TEST(draw_bits, DRAWBIT_CHAMBER)
 #else
   #define CHAMBER_ALT() false
 #endif
 #if ANIM_CUTTER
-  #define CUTTER_ALT(N) TEST(heat_bits, HEATBIT_CUTTER)
+  #define CUTTER_ALT(N) TEST(draw_bits, DRAWBIT_CUTTER)
 #else
   #define CUTTER_ALT() false
 #endif
-#if ANIM_COOLER
-  #define COOLER_ALT(N) TEST(heat_bits, HEATBIT_COOLER)
-#else
-  #define COOLER_ALT() false
-#endif
 
 #if DO_DRAW_HOTENDS
   #define MAX_HOTEND_DRAW _MIN(HOTENDS, ((LCD_PIXEL_WIDTH - (STATUS_LOGO_BYTEWIDTH + STATUS_FAN_BYTEWIDTH) * 8) / (STATUS_HEATERS_XSPACE)))
@@ -194,6 +192,15 @@ FORCE_INLINE void _draw_centered_temp(const celsius_t temp, const uint8_t tx, co
   lcd_put_wchar(LCD_STR_DEGREE[0]);
 }
 
+#if DO_DRAW_FLOWMETER
+  FORCE_INLINE void _draw_centered_flowrate(const float flow, const uint8_t tx, const uint8_t ty) {
+    const char *str = ftostr11ns(flow);
+    const uint8_t len = str[0] != ' ' ? 3 : str[1] != ' ' ? 2 : 1;
+    lcd_put_u8str(tx - len * (INFO_FONT_WIDTH) / 2 + 1, ty, &str[3-len]);
+    lcd_put_u8str("L");
+  }
+#endif
+
 #if DO_DRAW_HOTENDS
 
   // Draw hotend bitmap with current and target temperatures
@@ -384,6 +391,13 @@ FORCE_INLINE void _draw_centered_temp(const celsius_t temp, const uint8_t tx, co
   }
 #endif
 
+#if DO_DRAW_FLOWMETER
+  FORCE_INLINE void _draw_flowmeter_status() {
+    if (PAGE_CONTAINS(28 - INFO_FONT_ASCENT, 28 - 1))
+      _draw_centered_flowrate(cooler.flowrate, STATUS_FLOWMETER_TEXT_X, 28);
+  }
+#endif
+
 //
 // Before homing, blink '123' <-> '???'.
 // Homed but unknown... '123' <-> '   '.
@@ -451,17 +465,14 @@ void MarlinUI::draw_status_screen() {
     #if ANIM_HBCC
       uint8_t new_bits = 0;
       #if ANIM_HOTEND
-        HOTEND_LOOP() if (thermalManager.isHeatingHotend(e)) SBI(new_bits, HEATBIT_HOTEND + e);
+        HOTEND_LOOP() if (thermalManager.isHeatingHotend(e)) SBI(new_bits, DRAWBIT_HOTEND + e);
       #endif
-      if (TERN0(ANIM_BED, thermalManager.isHeatingBed())) SBI(new_bits, HEATBIT_BED);
+      if (TERN0(ANIM_BED, thermalManager.isHeatingBed())) SBI(new_bits, DRAWBIT_BED);
       #if DO_DRAW_CHAMBER && HAS_HEATED_CHAMBER
-        if (thermalManager.isHeatingChamber()) SBI(new_bits, HEATBIT_CHAMBER);
+        if (thermalManager.isHeatingChamber()) SBI(new_bits, DRAWBIT_CHAMBER);
       #endif
-      #if DO_DRAW_COOLER && HAS_COOLER
+      if (TERN0(ANIM_CUTTER, cutter.enabled())) SBI(new_bits, DRAWBIT_CUTTER);
-        if (thermalManager.isLaserCooling()) SBI(new_bits, HEATBIT_COOLER);
+      draw_bits = new_bits;
-      #endif
-      if (TERN0(ANIM_CUTTER, cutter.enabled())) SBI(new_bits, HEATBIT_CUTTER);
-      heat_bits = new_bits;
     #endif
 
     const xyz_pos_t lpos = current_position.asLogical();
@@ -646,17 +657,21 @@ void MarlinUI::draw_status_screen() {
 
     // Laser Cooler
     #if DO_DRAW_COOLER
-      #if ANIM_COOLER
+      const uint8_t coolery = STATUS_COOLER_Y(status_cooler_bmp1),
-        #define COOLER_BITMAP(S) ((S) ? status_cooler_bmp : status_cooler_on_bmp)
+                    coolerh = STATUS_COOLER_HEIGHT(status_cooler_bmp1);
-      #else
-        #define COOLER_BITMAP(S) status_cooler_bmp
-      #endif
-      const uint8_t coolery = STATUS_COOLER_Y(COOLER_ALT()),
-                    coolerh = STATUS_COOLER_HEIGHT(COOLER_ALT());
       if (PAGE_CONTAINS(coolery, coolery + coolerh - 1))
-        u8g.drawBitmapP(STATUS_COOLER_X, coolery, STATUS_COOLER_BYTEWIDTH, coolerh, COOLER_BITMAP(COOLER_ALT()));
+        u8g.drawBitmapP(STATUS_COOLER_X, coolery, STATUS_COOLER_BYTEWIDTH, coolerh, blink && cooler.enabled ? status_cooler_bmp2 : status_cooler_bmp1);
+    #endif
+
+    // Laser Cooler Flow Meter
+    #if DO_DRAW_FLOWMETER
+      const uint8_t flowmetery = STATUS_FLOWMETER_Y(status_flowmeter_bmp1),
+                    flowmeterh = STATUS_FLOWMETER_HEIGHT(status_flowmeter_bmp1);
+       if (PAGE_CONTAINS(flowmetery, flowmetery + flowmeterh - 1))
+        u8g.drawBitmapP(STATUS_FLOWMETER_X, flowmetery, STATUS_FLOWMETER_BYTEWIDTH, flowmeterh, blink && cooler.flowpulses ? status_flowmeter_bmp2 : status_flowmeter_bmp1);
     #endif
 
+
     // Heated Bed
     TERN_(DO_DRAW_BED, _draw_bed_status(blink));
 
@@ -666,6 +681,9 @@ void MarlinUI::draw_status_screen() {
     // Cooler
     TERN_(DO_DRAW_COOLER, _draw_cooler_status());
 
+    // Flowmeter
+    TERN_(DO_DRAW_FLOWMETER, _draw_flowmeter_status());
+
     // Fan, if a bitmap was provided
     #if DO_DRAW_FAN
       if (PAGE_CONTAINS(STATUS_FAN_TEXT_Y - INFO_FONT_ASCENT, STATUS_FAN_TEXT_Y - 1)) {

Marlin/src/lcd/language/language_en.h

@@ -116,10 +116,10 @@ namespace Language_en {
   PROGMEM Language_Str MSG_LASER_TOGGLE                    = _UxGT("Toggle Laser");
   PROGMEM Language_Str MSG_LASER_PULSE_MS                  = _UxGT("Test Pulse ms");
   PROGMEM Language_Str MSG_LASER_FIRE_PULSE                = _UxGT("Fire Pulse");
+  PROGMEM Language_Str MSG_FLOWMETER_FAULT                 = _UxGT("Coolant Flow Fault");
   PROGMEM Language_Str MSG_SPINDLE_TOGGLE                  = _UxGT("Toggle Spindle");
   PROGMEM Language_Str MSG_SPINDLE_FORWARD                 = _UxGT("Spindle Forward");
   PROGMEM Language_Str MSG_SPINDLE_REVERSE                 = _UxGT("Spindle Reverse");
-
   PROGMEM Language_Str MSG_SWITCH_PS_ON                    = _UxGT("Switch Power On");
   PROGMEM Language_Str MSG_SWITCH_PS_OFF                   = _UxGT("Switch Power Off");
   PROGMEM Language_Str MSG_EXTRUDE                         = _UxGT("Extrude");
@@ -278,6 +278,7 @@ namespace Language_en {
   PROGMEM Language_Str MSG_CHAMBER                         = _UxGT("Enclosure");
   PROGMEM Language_Str MSG_COOLER                          = _UxGT("Laser Coolant");
   PROGMEM Language_Str MSG_COOLER_TOGGLE                   = _UxGT("Toggle Cooler");
+  PROGMEM Language_Str MSG_FLOWMETER_SAFETY                = _UxGT("Flow Safety");
   PROGMEM Language_Str MSG_LASER                           = _UxGT("Laser");
   PROGMEM Language_Str MSG_FAN_SPEED                       = _UxGT("Fan Speed");
   PROGMEM Language_Str MSG_FAN_SPEED_N                     = _UxGT("Fan Speed ~");

Marlin/src/lcd/marlinui.cpp

@@ -1513,6 +1513,12 @@ void MarlinUI::update() {
     TERN_(HAS_LCD_MENU, return_to_status());
   }
 
+  void MarlinUI::flow_fault() {
+    LCD_ALERTMESSAGEPGM(MSG_FLOWMETER_FAULT);
+    TERN_(HAS_BUZZER, buzz(1000, 440));
+    TERN_(HAS_LCD_MENU, return_to_status());
+  }
+
   #if ANY(PARK_HEAD_ON_PAUSE, SDSUPPORT)
     #include "../gcode/queue.h"
   #endif

Marlin/src/lcd/marlinui.h

@@ -43,6 +43,10 @@
   #define HAS_ENCODER_ACTION 1
 #endif
 
+#if HAS_STATUS_MESSAGE
+  #define START_OF_UTF8_CHAR(C) (((C) & 0xC0u) != 0x80U)
+#endif
+
 #if E_MANUAL > 1
   #define MULTI_MANUAL 1
 #endif
@@ -311,6 +315,7 @@ public:
     static void abort_print();
     static void pause_print();
     static void resume_print();
+    static void flow_fault();
 
     #if HAS_WIRED_LCD
 

Marlin/src/lcd/menu/menu_temperature.cpp

@@ -35,7 +35,7 @@
   #include "../../module/motion.h"
 #endif
 
-#if HAS_COOLER
+#if HAS_COOLER || HAS_FLOWMETER
   #include "../../feature/cooler.h"
 #endif
 
@@ -192,11 +192,19 @@ void menu_temperature() {
   // Cooler:
   //
   #if HAS_COOLER
-    editable.state = cooler.is_enabled();
+    bool cstate = cooler.enabled;
-    EDIT_ITEM(bool, MSG_COOLER(TOGGLE), &cooler.state, []{ if (editable.state) cooler.disable(); else cooler.enable(); });
+    EDIT_ITEM(bool, MSG_COOLER_TOGGLE, &cstate, cooler.toggle);
     EDIT_ITEM_FAST(int3, MSG_COOLER, &thermalManager.temp_cooler.target, COOLER_MIN_TARGET, COOLER_MAX_TARGET, thermalManager.start_watching_cooler);
   #endif
 
+  //
+  // Flow Meter Safety Shutdown:
+  //
+  #if ENABLED(FLOWMETER_SAFETY)
+    bool fstate = cooler.flowsafety_enabled;
+    EDIT_ITEM(bool, MSG_FLOWMETER_SAFETY, &fstate, cooler.flowsafety_toggle);
+  #endif
+
   //
   // Fan Speed:
   //

Marlin/src/libs/numtostr.cpp

@@ -177,6 +177,15 @@ const char* i16tostr4signrj(const int16_t i) {
   return &conv[3];
 }
 
+// Convert unsigned float to string with 1.1 format
+const char* ftostr11ns(const float &f) {
+  const long i = UINTFLOAT(f, 1);
+  conv[4] = DIGIMOD(i, 10);
+  conv[5] = '.';
+  conv[6] = DIGIMOD(i, 1);
+  return &conv[4];
+}
+
 // Convert unsigned float to string with 1.23 format
 const char* ftostr12ns(const float &f) {
   const long i = UINTFLOAT(f, 2);

Marlin/src/libs/numtostr.h

@@ -61,6 +61,9 @@ const char* i16tostr3left(const int16_t xx);
 // Convert signed int to rj string with _123, -123, _-12, or __-1 format
 const char* i16tostr4signrj(const int16_t x);
 
+// Convert unsigned float to string with 1.2 format
+const char* ftostr11ns(const float &x);
+
 // Convert unsigned float to string with 1.23 format
 const char* ftostr12ns(const float &x);
 

Marlin/src/module/temperature.cpp

@@ -35,7 +35,7 @@
 #include "endstops.h"
 #include "planner.h"
 
-#if HAS_COOLER
+#if HAS_COOLER || HAS_FLOWMETER
   #include "../feature/cooler.h"
   #include "../feature/spindle_laser.h"
 #endif
@@ -52,6 +52,10 @@
   #include "../lcd/extui/ui_api.h"
 #endif
 
+#if ENABLED(HOST_PROMPT_SUPPORT)
+  #include "../feature/host_actions.h"
+#endif
+
 // LIB_MAX31855 can be added to the build_flags in platformio.ini to use a user-defined library
 #if LIB_USR_MAX31855
   #include <Adafruit_MAX31855.h>
@@ -1506,7 +1510,7 @@ void Temperature::manage_heater() {
 
     static bool flag_cooler_state; // = false
 
-    if (cooler.is_enabled()) {
+    if (cooler.enabled) {
       flag_cooler_state = true; // used to allow M106 fan control when cooler is disabled
       if (temp_cooler.target == 0) temp_cooler.target = COOLER_MIN_TARGET;
       if (ELAPSED(ms, next_cooler_check_ms)) {
@@ -1542,8 +1546,19 @@ void Temperature::manage_heater() {
     #if ENABLED(THERMAL_PROTECTION_COOLER)
       tr_state_machine[RUNAWAY_IND_COOLER].run(temp_cooler.celsius, temp_cooler.target, H_COOLER, THERMAL_PROTECTION_COOLER_PERIOD, THERMAL_PROTECTION_COOLER_HYSTERESIS);
     #endif
+
   #endif // HAS_COOLER
 
+  #if HAS_FLOWMETER
+    cooler.flowmeter_task(ms);
+    #if ENABLED(FLOWMETER_SAFETY)
+      if (cutter.enabled() && cooler.check_flow_too_low()) {
+        cutter.disable();
+        ui.flow_fault();
+      }
+    #endif
+  #endif
+
   UNUSED(ms);
 }
 

buildroot/tests/mega2560

@@ -167,6 +167,26 @@ exec_test $1 $2 "Azteeg X3 | Mixing Extruder (x5) | Gradient Mix | Greek" "$3"
 #opt_enable LCM1602
 #exec_test $1 $2 "Stuff" "$3"
 
+#
+# Test Laser features with 12864 LCD
+#
+restore_configs
+opt_set MOTHERBOARD BOARD_RAMPS_14_EFB LCD_LANGUAGE en TEMP_SENSOR_COOLER 1 EXTRUDERS 0 TEMP_SENSOR_1 0
+opt_enable REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER SDSUPPORT EEPROM_SETTINGS EEPROM_BOOT_SILENT EEPROM_AUTO_INIT \
+           LASER_FEATURE LASER_COOLANT_FLOW_METER
+
+exec_test $1 $2 "REPRAP MEGA2560 RAMPS | Laser Feature | Cooler | Flowmeter | 12864 LCD " "$3"
+
+#
+# Test Laser features with 44780 LCD
+#
+restore_configs
+opt_set MOTHERBOARD BOARD_RAMPS_14_EFB LCD_LANGUAGE en TEMP_SENSOR_COOLER 1 EXTRUDERS 0 TEMP_SENSOR_1 0
+opt_enable REPRAP_DISCOUNT_SMART_CONTROLLER SDSUPPORT EEPROM_SETTINGS EEPROM_BOOT_SILENT EEPROM_AUTO_INIT \
+           LASER_FEATURE LASER_COOLANT_FLOW_METER
+
+exec_test $1 $2 "REPRAP MEGA2560 RAMPS | Laser Feature | Cooler | Flowmeter | 44780 LCD " "$3"
+
 #
 # Language files test with REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER
 #

platformio.ini

@@ -82,6 +82,7 @@ default_src_filter = +<src/*> -<src/config> -<src/HAL> +<src/HAL/shared>
   -<src/feature/caselight.cpp> -<src/gcode/feature/caselight>
   -<src/feature/closedloop.cpp>
   -<src/feature/controllerfan.cpp> -<src/gcode/feature/controllerfan>
+  -<src/feature/cooler.cpp>  -<src/gcode/temp/M143_M193.cpp>
   -<src/feature/dac> -<src/feature/digipot>
   -<src/feature/direct_stepping.cpp> -<src/gcode/motion/G6.cpp>
   -<src/feature/e_parser.cpp>
@@ -198,7 +199,6 @@ default_src_filter = +<src/*> -<src/config> -<src/HAL> +<src/HAL/shared>
   -<src/gcode/sd/M32.cpp>
   -<src/gcode/sd/M808.cpp>
   -<src/gcode/temp/M104_M109.cpp>
-  -<src/gcode/temp/M143_M193.cpp>
   -<src/gcode/temp/M155.cpp>
   -<src/gcode/units/G20_G21.cpp>
   -<src/gcode/units/M149.cpp>
@@ -411,7 +411,7 @@ SDSUPPORT               = src_filter=+<src/sd/cardreader.cpp> +<src/sd/Sd2Card.c
 HAS_MEDIA_SUBCALLS      = src_filter=+<src/gcode/sd/M32.cpp>
 GCODE_REPEAT_MARKERS    = src_filter=+<src/feature/repeat.cpp> +<src/gcode/sd/M808.cpp>
 HAS_EXTRUDERS           = src_filter=+<src/gcode/temp/M104_M109.cpp> +<src/gcode/config/M221.cpp>
-HAS_COOLER              = src_filter=-<src/gcode/temp/M143_M193.cpp>
+HAS_COOLER              = src_filter=+<src/feature/cooler.cpp> +<src/gcode/temp/M143_M193.cpp>
 AUTO_REPORT_TEMPERATURES = src_filter=+<src/gcode/temp/M155.cpp>
 INCH_MODE_SUPPORT       = src_filter=+<src/gcode/units/G20_G21.cpp>
 TEMPERATURE_UNITS_SUPPORT = src_filter=+<src/gcode/units/M149.cpp>