heater.cfg

# this is needed to support the M118 and/or RESPOND command
[respond]

[heater_fan chamber_fan]
pin: PC8
kick_start_time: 0.5
off_below: 0.03
heater: chamber
heater_temp: 35
fan_speed: 0.5

[heater_generic chamber]
heater_pin: PA3
sensor_type: Generic 3950
sensor_pin: PA1
min_temp: 0
max_temp: 70
control = pid
pid_kp = 55.031
pid_ki = 0.475
pid_kd = 1595.197

[verify_heater chamber]
max_error: 120
check_gain_time:60
hysteresis: 10
heating_gain: 1

[gcode_macro M191]
# this is needed to support slicers' chamber heater options
# https://marlinfw.org/docs/gcode/M191.html
gcode:
  {% set target = params.S | default(0) | float %}
  RESPOND MSG="Heating chamger to {target}C ..."
  SET_HEATER_TEMPERATURE HEATER=chamber TARGET={target}
  RESPOND MSG="Waiting for chamber to reach {target}C ..."
  TEMPERATURE_WAIT SENSOR="heater_generic chamber" MINIMUM={target}
  RESPOND MSG="Chamber heating {target}C is done."
  UPDATE_DELAYED_GCODE ID=_scheduled_exhaust DURATION=10
  
[delayed_gcode _scheduled_exhaust]
gcode:
  {% if printer.idle_timeout.state == "Printing" %}
    UPDATE_DELAYED_GCODE ID=_scheduled_exhaust DURATION=10
  {% else %}
    # if we got here, the chamber heater was used, and printing is done
    RESPOND MSG="Printing finished, starting to cool chamber ..."
    SET_PIN PIN=fan3 VALUE=255
    UPDATE_DELAYED_GCODE ID=_check_exhaust_needed DURATION=10
  {% endif %}

# once the exhaust fan starts, check to see if the chamber has cooled sufficiently
[delayed_gcode _check_exhaust_needed]
gcode:
  # check the current chamber temp
  {% set chamber_temp = printer['heater_generic chamber'].temperature|float %}
  {% if chamber_temp >= 30 %}
    UPDATE_DELAYED_GCODE ID=_check_exhaust_needed DURATION=10
  {% else %}
    RESPOND MSG="Chamber sufficiently cooled, disabling exhaust ..."
    SET_PIN PIN=fan3 VALUE=0
  {% endif %}