Frix-x · Frix-x · Feb 26, 2024 · Feb 25, 2024 · Feb 26, 2024 · Feb 26, 2024
diff --git a/config/hardware/fans/hotend_fan_tachometer.cfg b/config/hardware/fans/hotend_fan_tachometer.cfg
@@ -0,0 +1,14 @@
+[gcode_macro _USER_VARIABLES]
+variable_hotend_fan_tach_enabled: True
+gcode:
+
+[heater_fan hotend_fan]
+pin: E_FAN
+max_power: 1.0
+kick_start_time: 0.100
+heater: extruder
+heater_temp: 50.0
+tachometer_pin: E_FAN_TACHO
+
+# And we also include the tachometer check macros from here
+[include ../../../macros/helpers/tachometer_check.cfg]
diff --git a/config/hardware/fans/part_fan_tachometer.cfg b/config/hardware/fans/part_fan_tachometer.cfg
@@ -0,0 +1,12 @@
+[gcode_macro _USER_VARIABLES]
+variable_part_fan_tach_enabled: True
+gcode:
+
+[fan]
+pin: PART_FAN
+kick_start_time: 0.100
+cycle_time: 0.010
+tachometer_pin: PART_FAN_TACHO
+
+# And we also include the tachometer check macros from here
+[include ../../../macros/helpers/tachometer_check.cfg]
diff --git a/config/mcu_definitions/toolhead/LDO_Nitehawk-SB_v1.0.cfg b/config/mcu_definitions/toolhead/LDO_Nitehawk-SB_v1.0.cfg
@@ -0,0 +1,20 @@
+[board_pins toolhead_manufacturer]
+mcu: toolhead
+aliases:
+    MCU_EMOT_EN=gpio25 , MCU_EMOT_STEP=gpio23 , MCU_EMOT_DIR=gpio24 , MCU_EMOT_UART=gpio0 , MCU_EMOT_TX=gpio1 ,
+
+    MCU_ENDSTOP_X=gpio13 , MCU_ENDSTOP_Y=gpio12 ,
+    MCU_HV_ENDSTOP=gpio10 ,
+
+    MCU_FAN0=gpio5 , MCU_FAN1=gpio6 , 
+    MCU_PWM0=gpio16 , MCU_PWM1=gpio17 ,
+
+    MCU_TEMP=gpio29 , 
+
+    MCU_HEAT=gpio9 , MCU_HEAT_CHAMBER=gpio28 , MCU_NH_TEMP=gpio26 ,
+
+    MCU_RGB=gpio17 , MCU_ACTIVITY_LED=gpio8 ,
+
+    MCU_ADXL_CS=gpio21 , MCU_ADXL_SCK=gpio18 , MCU_ADXL_MOSI=gpio20 , MCU_ADXL_MISO=gpio19 ,
+
+    MCU_FS=gpio3 , MCU_SU=gpio2 , MCU_ST_UART_TX=gpio1 , MCU_ST_UART_RX=gpio0 ,
diff --git a/docs/pinout.md b/docs/pinout.md
@@ -57,7 +57,9 @@ Here is a list of all the "Frix-x names" available to use in your own board_pins
 #### Fans
 
   - `E_FAN`: hotend fan. This fan should stay at 100% whenever the hotend is hot, so a PWM capable pin is not mandatory
+  - `E_FAN_TACHO`: tachometer of the hotend fan, optional and used to validate that the fan is spinning as a safety feature
   - `PART_FAN`: part fan used during the print. This pin should be a PWM capable pin to allow modulation of the fan speed
+  - `PART_FAN_TACHO`: tachometer of the part fan, optional and used to validate that the fan is spinning as a safety feature
   - `EXHAUST_FAN`: for an exhaust filter (such as the Voron basic exhaust). This pin should be a PWM capable pin to allow modulation of the fan speed
   - `FILTER_FAN`: for a filter (such as a Nevermore filter). This pin should be a PWM capable pin to allow modulation of the fan speed
   - `CONTROLLER_FAN`: to cool down your MCUs or electronic bay

diff --git a/macros/base/cancel_print.cfg b/macros/base/cancel_print.cfg
@@ -13,6 +13,7 @@ gcode:
     {% set bed_mesh_enabled = printer["gcode_macro _USER_VARIABLES"].bed_mesh_enabled %}
     {% set filament_sensor_enabled = printer["gcode_macro _USER_VARIABLES"].filament_sensor_enabled %}
     {% set filter_default_time = printer["gcode_macro _USER_VARIABLES"].filter_default_time_on_end_print|default(600)|int %}
+    {% set hotend_fan_tach_enabled = printer["gcode_macro _USER_VARIABLES"].hotend_fan_tach_enabled %}
 
     PARK
 
@@ -33,6 +34,10 @@ gcode:
         SET_HEATER_TEMPERATURE HEATER=extruder TARGET={safe_extruder_temp}
     {% endif %}
 
+    {% if hotend_fan_tach_enabled %}
+        UPDATE_DELAYED_GCODE ID=_BACKGROUND_HOTEND_TACHO_CHECK DURATION=0
+    {% endif %}
+
     M107
     M400
 

diff --git a/macros/base/end_print.cfg b/macros/base/end_print.cfg
@@ -13,6 +13,7 @@ gcode:
     {% set bed_mesh_enabled = printer["gcode_macro _USER_VARIABLES"].bed_mesh_enabled %}
     {% set filter_default_time = printer["gcode_macro _USER_VARIABLES"].filter_default_time_on_end_print|default(600)|int %}
     {% set filament_sensor_enabled = printer["gcode_macro _USER_VARIABLES"].filament_sensor_enabled %}
+    {% set hotend_fan_tach_enabled = printer["gcode_macro _USER_VARIABLES"].hotend_fan_tach_enabled %}
 
     PARK
 
@@ -33,6 +34,10 @@ gcode:
         SET_HEATER_TEMPERATURE HEATER=extruder TARGET={safe_extruder_temp}
     {% endif %}
 
+    {% if hotend_fan_tach_enabled %}
+        UPDATE_DELAYED_GCODE ID=_BACKGROUND_HOTEND_TACHO_CHECK DURATION=0
+    {% endif %}
+
     M107
     M400
 

diff --git a/macros/base/start_print.cfg b/macros/base/start_print.cfg
@@ -61,6 +61,8 @@ gcode:
     {% set firmware_retraction_enabled = printer["gcode_macro _USER_VARIABLES"].firmware_retraction_enabled %}
     {% set filter_enabled = printer["gcode_macro _USER_VARIABLES"].filter_enabled %}
     {% set filament_sensor_enabled = printer["gcode_macro _USER_VARIABLES"].filament_sensor_enabled %}
+    {% set part_fan_tach_enabled = printer["gcode_macro _USER_VARIABLES"].part_fan_tach_enabled %}
+    {% set hotend_fan_tach_enabled = printer["gcode_macro _USER_VARIABLES"].hotend_fan_tach_enabled %}
 
     {% if MATERIAL not in printer["gcode_macro _USER_VARIABLES"].material_parameters %}
         RESPOND MSG="Material '{MATERIAL}' is unknown!"
@@ -96,6 +98,19 @@ gcode:
         STOP_FILTER
     {% endif %}
 
+    # If a tachometer is enabled on one of the fans, we check them:
+    #   - It's done only once for the part fan to be sure nothing block it before starting the print
+    #   - And as a safety feature, we start a monitoring loop for the hotend fan (that is automatically stopped at the end of a print)
+    {% if part_fan_tach_enabled %}
+        M106 S255
+        G4 P2000
+        _PART_FAN_CHECK
+        M106 S0
+    {% endif %}
+    {% if hotend_fan_tach_enabled %}
+        UPDATE_DELAYED_GCODE ID=_BACKGROUND_HOTEND_TACHO_CHECK DURATION=1
+    {% endif %}
+
     SET_GCODE_OFFSET Z=0
     M221 S100
     M220 S100

diff --git a/macros/helpers/tachometer_check.cfg b/macros/helpers/tachometer_check.cfg
@@ -0,0 +1,44 @@
+## This config file contains macros that are used in conjuction with tacho-enabled hotend and part fans
+
+# Monitoring loop for hotend fan safety check
+[delayed_gcode _BACKGROUND_HOTEND_TACHO_CHECK]
+gcode:
+    _HOTEND_FAN_CHECK
+    UPDATE_DELAYED_GCODE ID=_BACKGROUND_HOTEND_TACHO_CHECK DURATION=3
+
+[gcode_macro _HOTEND_FAN_CHECK]
+description: Check the hotend fan tachometer to verify that it is running effectively
+variable_he_stop_count: 0
+gcode:
+    {% set min_rpm = 1000|float %} # This is a relatively low value adapted to all fans to check that they are effectively running
+    {% set max_consecutive_stops = 3 %}
+    {% set rpm = printer['heater_fan hotend_fan'].rpm|float %}
+    {% set he_target = printer[printer.toolhead.extruder].target|float %}
+    {% set he_temp = printer[printer.toolhead.extruder].temperature|float %}
+    {% set fan_on_temp = printer.configfile.settings['heater_fan hotend_fan'].heater_temp|float %}
+    {% set he_stop_count = printer["gcode_macro _HOTEND_FAN_CHECK"].he_stop_count|int %}
+
+    {% if (he_target >= fan_on_temp) and (rpm < min_rpm) and (he_temp >= fan_on_temp) %}
+        SET_GCODE_VARIABLE MACRO=_HOTEND_FAN_CHECK VARIABLE=he_stop_count VALUE={he_stop_count + 1}
+        RESPOND MSG="Hotend fan stoppage detected for {(he_stop_count+1)*3}sec (max {max_consecutive_stops*3}sec allowed)"
+        M400
+        {% if printer["gcode_macro _HOTEND_FAN_CHECK"].he_stop_count|int >= max_consecutive_stops-1 %}
+            CANCEL_PRINT
+        {% endif %}
+    {% else %}
+        SET_GCODE_VARIABLE MACRO=_HOTEND_FAN_CHECK VARIABLE=he_stop_count VALUE=0
+    {% endif %}
+
+
+[gcode_macro _PART_FAN_CHECK]
+description: Check the part fan tachometer to verify that it is running effectively
+gcode:
+    {% if printer.fan.rpm is not none %}
+        {% if printer.fan.rpm > 1000 %} # This is a relatively low value adapted to all fans to check that they are effectively running
+            {action_respond_info("Part fan OK!")}
+        {% else %}
+            M400
+            CANCEL_PRINT
+            {action_raise_error("Hotend fan stoppage detected, print was canceled!")}
+        {% endif %}
+    {% endif %}
diff --git a/user_templates/mcu_defaults/main/BTT_SKR_3.cfg b/user_templates/mcu_defaults/main/BTT_SKR_3.cfg
@@ -1,3 +1,4 @@
+
 #-------------------------------------#
 #### BTT SKR3 definition ####
 #-------------------------------------#

diff --git a/user_templates/mcu_defaults/main/BTT_SKR_Pro_V1.2.cfg b/user_templates/mcu_defaults/main/BTT_SKR_Pro_V1.2.cfg
@@ -1,3 +1,4 @@
+
 #----------------------------------------#
 #### BTT SKR Pro v1.2 definition ########
 #----------------------------------------#

diff --git a/user_templates/mcu_defaults/main/MY-OWN-CUSTOM-TEMPLATE.cfg b/user_templates/mcu_defaults/main/MY-OWN-CUSTOM-TEMPLATE.cfg
@@ -37,7 +37,9 @@ aliases:
     E_HEATER=   , E_TEMPERATURE=   ,
     BED_HEATER= , BED_TEMPERATURE= ,
 
-    PART_FAN= , E_FAN= ,
+    PART_FAN=      , E_FAN= ,
+    PART_FAN_TACHO , E_FAN_TACHO ,
+
     CONTROLLER_FAN=        ,
     EXHAUST_FAN=           ,
     FILTER_FAN=            ,

diff --git a/user_templates/mcu_defaults/toolhead/LDO_Nitehawk-SB_v1.0.cfg b/user_templates/mcu_defaults/toolhead/LDO_Nitehawk-SB_v1.0.cfg
@@ -0,0 +1,84 @@
+
+#-------------------------------------------------------#
+#### LDO Nighthawk SB toolhead v1 MCU definition ########
+#-------------------------------------------------------#
+
+[mcu toolhead]
+##--------------------------------------------------------------------
+serial: /dev/serial/by-id/usb-1a86_USB2.0-Serial-if00-port0 ##### <---  change-me-to-the-correct-serial  hint: ls /dev/serial/by-id/*   #
+##--------------------------------------------------------------------
+
+# If you want to override the wiring of the LDO Nighthawk, keep in mind that this
+# board is defined using the "toolhead" name. So you should use "pin: toolhead:PIN_NAME"
+# in your own overrides.cfg files.
+
+[include config/mcu_definitions/toolhead/LDO_Nitehawk-SB_v1.0.cfg] # Do not remove this line
+[board_pins nitehawk_mcu]
+mcu: toolhead
+aliases:
+    E_STEP=MCU_EMOT_STEP , E_DIR=MCU_EMOT_DIR , E_ENABLE=MCU_EMOT_EN , E_TMCUART=MCU_EMOT_UART ,
+
+    X_STOP=MCU_ENDSTOP_X ,
+    PROBE_INPUT=MCU_HV_ENDSTOP ,
+
+    E_HEATER=MCU_HEAT , E_TEMPERATURE=MCU_TEMP , CHAMBER_TEMPERATURE=MCU_HEAT_CHAMBER , 
+    NH_MCU_TEMP=MCU_NH_TEMP ,
+
+    PART_FAN=MCU_FAN1       , E_FAN=MCU_FAN0 ,
+    PART_FAN_TACHO=MCU_PWM0 , E_FAN_TACHO=MCU_PWM1 ,
+
+    STATUS_NEOPIXEL=MCU_RGB , STATUS_BOARD=MCU_ACTIVITY_LED , 
+
+    ADXL_CS=MCU_ADXL_CS , ADXL_SCLK=MCU_ADXL_SCK , ADXL_MOSI=MCU_ADXL_MOSI , ADXL_MISO=MCU_ADXL_MISO ,
+
+    TX_PIN=MCU_ST_UART_TX , 
+
+
+#----------------------------------------#
+#  LDO Nighthawk-SB v1 pins remapping    #
+#----------------------------------------#
+
+# These pins overrides are automatically added when you select the LDO
+# toolhead MCU during the installation process. They should provide a
+# good base to work with. Feel free to adapt to your board if needed!
+
+[extruder]
+step_pin: toolhead:E_STEP
+dir_pin: toolhead:E_DIR
+enable_pin: !toolhead:E_ENABLE
+heater_pin: toolhead:E_HEATER
+sensor_pin: toolhead:E_TEMPERATURE
+pullup_resistor: 2200
+
+[tmc2209 extruder]
+uart_pin: toolhead:E_TMCUART
+tx_pin: toolhead:TX_PIN
+sense_resistor: 0.100
+
+[probe]
+pin: ^toolhead:PROBE_INPUT
+
+[fan]
+pin: toolhead:PART_FAN
+#tachometer_pin: toolhead:PART_FAN_TACHO
+
+[heater_fan hotend_fan]
+pin: toolhead:E_FAN
+# tachometer_pin: toolhead:E_FAN_TACHO
+
+## Uncomment the following line if not using sensorless homing
+## and having the X endstop plugged to the toolhead MCU
+# [stepper_x]
+# endstop_pin: ^toolhead:X_STOP
+
+[neopixel status_leds]
+pin: toolhead:STATUS_NEOPIXEL
+
+## Nitehawk PCB temperature sensor
+[temperature_sensor nh_temp]
+sensor_type: CMFB103F3950FANT
+sensor_pin: toolhead:NH_MCU_TEMP
+pullup_resistor: 2200
+min_temp: 0
+max_temp: 100
+
diff --git a/user_templates/printer.cfg b/user_templates/printer.cfg
@@ -113,6 +113,10 @@
 ### --------------------------------------------------------------------------------------
 # [include config/hardware/fans/hotend_fan.cfg]
 # [include config/hardware/fans/part_fan.cfg]
+
+# [include config/hardware/fans/hotend_fan_tachometer.cfg] # When having a tachometer monitoring hotend fan speed
+# [include config/hardware/fans/part_fan_tachometer.cfg] # When having a tachometer monitoring part fan speed
+
 # [include config/hardware/fans/controller_fan.cfg]
 # [include config/hardware/fans/rpi_fan.cfg]
 # ----------------------------------------------------------------------------------------
@@ -156,7 +160,7 @@
 # [include config/hardware/temperature_sensors/cabinet_temp.cfg]
 # [include config/hardware/temperature_sensors/chamber_temp.cfg]
 # [include config/hardware/temperature_sensors/chamber_temp_ds18b20.cfg] # Specific for DS18B20 directly connected to the Pi
-# [include config/hardware/temperature_sensors/chamber_temp_toolhead.cfg] # This is not recommended as toolhead board temperature sensors are not accurate
+# [include config/hardware/temperature_sensors/chamber_temp_toolhead.cfg] # This is to use a toolhead integrated temperature sensor (or an external one as it's done on the LDO Nitehawk)
 # ----------------------------------------------------------------------------------------