Heat bed output options

General Discussion
1

Basic Information:

Printer Model:
MCU / Printerboard:
Host / SBC
klippy.log

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Describe your issue:

…hello I’m building a large format printer with 6 heating pads I have a separate controller to control the pads in way to evenly heat up table and not to overload the input power looking for a simple way to link klipper to a plc? thinking a simple on off output and use the temp setting to send out a pwm for temp setting for example C60 would output 60Hz ,C100 100Hz this way my controller can control the temp by a setting and on off no just on off so is there a way to output temp setting in Hz

2

Couldn’t you assign a GPIO pin as an LED. Write a macro to intercept M140 and set led PWM as you see fit.
[led] configuration

The hard part is going to be getting bed temperature to show in the UI.

3

Hi @atvracer ,

What you could do is configure a [pwm_cycle_time] and use the SET_PIN PIN=x VALUE=1 CYCLE_TIME=x command.

4

Much better than my solution.

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5

Awesome thank you I’ll try that when I get home , I do have a temp sensor in the middle of the table so klipper and I can monitor it from that side

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6

sorry I’m new programing klipper i got the PWM to work by adjusting the Miscellaneous section on the dashboard 0-100% but i cant get the Heater Bed to adjust the pwm i can use 0-100% or C=HZ ether is fine

can you show me example of Heater_bed would look like

Thanks

[heater_bed]
heater_pin: Cubic:gpio7
sensor_pin: PB1
sensor_type: EPCOS 100K B57560G104F
control: watermark
min_temp: 0
max_temp: 120
pwm_cycle_time: .3

7

Hi @atvracer ,

You wouldn’t use a heater_bed config section with the pwm approach. You would setup a pwm_cycle_time section with the link I previously provided and control it with GCode commands.

8

Thanks this got in the right direction and I got it working

1 Like
9

If this is solved, please mark one of the posts here as the solution so other people know the issue is resolved.

10

ok i went into a deep hole still needs work and testing but this is what i have so far my plc will use the Cubic:gpio7 to turn on-off Cubic:gpio8 will set the temp to the plc so the plc has a reference and the plc will adjust all 6 heating pads independently and balance the temp. sensor temp-1 to 6 just to monitor the bed on the klipper screen and PB1 is what klipper will monitor

 #############################
#  PLC control 
##############################

[output_pin secondary_heater_pwm]
pin: Cubic:gpio8 
pwm: True
value: 0.5
shutdown_value: 0
cycle_time: 0.1 

[gcode_macro UPDATE_HEATER_PWM]
gcode:
    {% set bed_temp = printer.heater_bed.temperature %}
    {% set target_temp = printer.heater_bed.target %}

    
    {% if bed_temp > 0 and target_temp > 0 %}
        
      
       {% set power_level = [target_temp / 100, 1.0]|min %}    # {% set power_level = [bed_temp / 100, 1.0]|min %}
        SET_PIN PIN=secondary_heater_pwm VALUE={power_level}
        #M117 PWM set to {power_level * 100}%
    {% else %}
        # Turn the output pin off if the bed heater is off
        SET_PIN PIN=secondary_heater_pwm VALUE=0
        #M117 PWM is off
    {% endif %}

[delayed_gcode update_pwm_continuously]
initial_duration: 1.0 # Run once after 1 second of boot
gcode:
  UPDATE_HEATER_PWM
  UPDATE_DELAYED_GCODE ID=update_pwm_continuously DURATION=5.0 # Repeat every 5 seconds


####################################################


[heater_bed]
heater_pin: Cubic:gpio7
sensor_pin: PB1  
sensor_type: EPCOS 100K B57560G104F
control: watermark
min_temp: 0
max_temp: 130

######################################################

[temperature_sensor BED_1]

sensor_type: EPCOS 100K B57560G104F
sensor_pin: PB0
min_temp: 0
max_temp: 130

[temperature_sensor BED_2]

sensor_type: EPCOS 100K B57560G104F
sensor_pin: PC5
max_temp: 130
min_temp: 0


[temperature_sensor BED_3]

sensor_type: EPCOS 100K B57560G104F
sensor_pin: PC4
max_temp: 130
min_temp: 0


[temperature_sensor BED_4]

sensor_type: EPCOS 100K B57560G104F
sensor_pin: PA7
max_temp: 130
min_temp: 0


[temperature_sensor BED_5]

sensor_type: EPCOS 100K B57560G104F
sensor_pin:Cubic:gpio26
max_temp: 130
min_temp: 0



[temperature_sensor BED_6]

sensor_type: EPCOS 100K B57560G104F
sensor_pin:Cubic:gpio27
max_temp: 130
min_temp: 0
1 Like