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3 fans on tool board 1lc?

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Duet Hardware and wiring
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  • undefined
    gnydick
    last edited by 30 Jul 2024, 18:16

    I'd like to be able to control 3 fans on a toolboard.

    1. cold section, thermostatically controlled
    2. primary part cooling fan
    3. secondary cooling fan

    I have some relatively powerful blower fans on my tools and when printing fast I want to use both of them, but when printing slower, only one of them.

    Any ideas?

    undefined undefined 2 Replies Last reply 30 Jul 2024, 18:47 Reply Quote 0
    • undefined
      jay_s_uk @gnydick
      last edited by jay_s_uk 30 Jul 2024, 18:47

      @gnydick there are only 2 controllable fan outputs.
      You would have to add some sort of relay or MOSFET module and control it using one of the iox.out pins
      Or run an extra cable and use a fan connection on the mainboard

      Owns various duet boards and is the main wiki maintainer for the Teamgloomy LPC/STM32 port of RRF. Assume I'm running whatever the latest beta/stable build is

      undefined 1 Reply Last reply 30 Jul 2024, 20:21 Reply Quote 0
      • undefined
        gnydick @jay_s_uk
        last edited by 30 Jul 2024, 20:21

        @jay_s_uk if there was another .out, then I'd be able to just assign it to a fan, wouldn't I? There are no .out's left.

        1 Reply Last reply Reply Quote 0
        • undefined
          gloomyandy @gnydick
          last edited by 30 Jul 2024, 20:33

          @gnydick You can't normally connect io0.out directly to a fan. But if any of the fans are 4 wire you may be able to control the speed with the logic level output, you would need to check the voltage required by the fan on the pwm input and the current it might draw. That's assuming you are not already using io0.out for something like a bl-touch. You may be able to use io0.in as a logic level output (again assuming it is not already being used), but I'm not sure if it is pwm capable or if there is any risk to the board if you do that.

          undefined 1 Reply Last reply 31 Jul 2024, 00:14 Reply Quote 2
          • undefined
            gnydick @gloomyandy
            last edited by 31 Jul 2024, 00:14

            @gloomyandy, yep, I'm using IO0 for filament sensor/eject button

            undefined 2 Replies Last reply 31 Jul 2024, 01:32 Reply Quote 0
            • undefined
              gloomyandy @gnydick
              last edited by 31 Jul 2024, 01:32

              @gnydick are you using both io0.in and io0.out?

              1 Reply Last reply Reply Quote 0
              • undefined
                gloomyandy @gnydick
                last edited by 31 Jul 2024, 01:33

                @gnydick What version of the 1lc do you have?

                undefined 1 Reply Last reply 9 Aug 2024, 18:15 Reply Quote 0
                • undefined
                  gnydick @gloomyandy
                  last edited by 9 Aug 2024, 18:15

                  @gloomyandy yes, using all of the pins. The latest version.

                  undefined undefined 2 Replies Last reply 10 Aug 2024, 11:46 Reply Quote 0
                  • undefined
                    gloomyandy @gnydick
                    last edited by 10 Aug 2024, 11:46

                    @gnydick Assuming it is a rev 1.3 board (possibly also on 1.2), there is an unpopulated pad for IO_3.in which you may be able to solder a wire to. I'm not sure if this can be used as an output though at least for pwm output, if not you may be able to shuffle some of the pins you are already using around and use io_3.in for an input. Other than that I think you are out of luck.

                    1 Reply Last reply Reply Quote 0
                    • undefined
                      dc42 administrators @gnydick
                      last edited by 15 Aug 2024, 17:41

                      @gnydick said in 3 fans on tool board 1lc?:

                      @gloomyandy yes, using all of the pins. The latest version.

                      Including io0.out ? You said you were using IO0 for the filament sensor eject button, but I would have thought you only needed to use io0.in for that.

                      Duet WiFi hardware designer and firmware engineer
                      Please do not ask me for Duet support via PM or email, use the forum
                      http://www.escher3d.com, https://miscsolutions.wordpress.com

                      undefined 1 Reply Last reply 16 Aug 2024, 22:57 Reply Quote 0
                      • undefined
                        gnydick @dc42
                        last edited by gnydick 16 Aug 2024, 22:57

                        @dc42 2 switches, filament out sense, and eject button the specs are here, https://www.orbiterprojects.com/orbiter-filament-sensor/

                        undefined 1 Reply Last reply 17 Aug 2024, 15:55 Reply Quote 0
                        • undefined
                          dc42 administrators @gnydick
                          last edited by 17 Aug 2024, 15:55

                          @gnydick you could free up IO0.OUT by using one of the buttons on the tool board for filament unload instead of the one on the filament monitor; or you could connect the filament monitor button to the IO3_IN pads instead.

                          Duet WiFi hardware designer and firmware engineer
                          Please do not ask me for Duet support via PM or email, use the forum
                          http://www.escher3d.com, https://miscsolutions.wordpress.com

                          undefined 1 Reply Last reply 18 Aug 2024, 00:00 Reply Quote 0
                          • undefined
                            gnydick @dc42
                            last edited by 18 Aug 2024, 00:00

                            @dc42 very true, very true.

                            1 Reply Last reply Reply Quote 0
                            • undefined
                              dwuk3d
                              last edited by 20 Jan 2025, 07:55

                              @gnydick - did you manage to get a 3rd fan working ok using the suggestion by @dc42 ?

                              I am trying to wire up a Sovol SV08 extruder (which also has 3 fans) - I was thinking I would have to run separate cables for the 3rd fan - but it would be neater if I could avoid this.

                              My current thinking is in the attached diagram.

                              Screenshot 2025-01-20 at 07.46.04.png

                              undefined undefined 2 Replies Last reply 20 Jan 2025, 07:57 Reply Quote 0
                              • undefined
                                jay_s_uk @dwuk3d
                                last edited by 20 Jan 2025, 07:57

                                @dwuk assuming 2 fans are the part cooling fans, could you not just run them in parallel off the same connector? Assuming combined they pull less than 1A

                                Owns various duet boards and is the main wiki maintainer for the Teamgloomy LPC/STM32 port of RRF. Assume I'm running whatever the latest beta/stable build is

                                undefined 1 Reply Last reply 20 Jan 2025, 08:14 Reply Quote 1
                                • undefined
                                  dwuk3d @jay_s_uk
                                  last edited by dwuk3d 20 Jan 2025, 08:14

                                  @jay_s_uk I think you might be right. Checking the wiring the two cooling fans are connected to FAN2 and FAN4 on the Sovol Board.

                                  Which are in turn defined as generic fans fan0 and fan1 - in printer.cfg
                                  [fan_generic fan0] # back model cooling fan
                                  pin: extra_mcu:PA7
                                  max_power: 1.0

                                  [fan_generic fan1] # front model cooling fan
                                  pin: extra_mcu:PB1
                                  max_power: 1.0

                                  From looking at the macro.cfg - it looks like fan0 and fan1 are switched on and off together - so will try wiring them both up to Out2 as you suggest

                                  Next issue is the fans are probably 24v - so might have to change the fans?

                                  [gcode_macro M106]
                                  gcode:
                                  {% set fan = 'fan' + (params.P|int if params.P is defined else 0)|string %}
                                  {% set speed = (params.S|float / 255 if params.S is defined else 1.0) %}
                                  {% if fan == 'fan3'%}
                                  SET_FAN_SPEED FAN={fan} SPEED={speed}
                                  {% else %}
                                  SET_FAN_SPEED FAN={'fan0'} SPEED={speed}
                                  SET_FAN_SPEED FAN={'fan1'} SPEED={speed}
                                  {% endif %}

                                  [gcode_macro M107]
                                  gcode:
                                  {% set fan = 'fan' + (params.P|int if params.P is defined else 0)|string %}
                                  {% if fan == 'fan3'%}
                                  SET_FAN_SPEED FAN={fan} SPEED=0
                                  {% else %}
                                  SET_FAN_SPEED FAN={'fan0'} SPEED=0
                                  SET_FAN_SPEED FAN={'fan1'} SPEED=0
                                  {% endif %}

                                  T3P3Tonyundefined 1 Reply Last reply 20 Jan 2025, 08:54 Reply Quote 0
                                  • T3P3Tonyundefined
                                    T3P3Tony administrators @dwuk3d
                                    last edited by 20 Jan 2025, 08:54

                                    @dwuk said in 3 fans on tool board 1lc?:

                                    Next issue is the fans are probably 24v - so might have to change the fans?

                                    What voltage are you supplying the toolboard?

                                    www.duet3d.com

                                    undefined 2 Replies Last reply 20 Jan 2025, 08:59 Reply Quote 0
                                    • undefined
                                      dwuk3d @T3P3Tony
                                      last edited by dwuk3d 20 Jan 2025, 08:59

                                      @T3P3Tony I think I'm going to need 24v for the hot end - so 24v input I guess.

                                      Screenshot 2025-01-20 at 09.01.14.png

                                      1 Reply Last reply Reply Quote 0
                                      • undefined
                                        dwuk3d @T3P3Tony
                                        last edited by 20 Jan 2025, 09:10

                                        @T3P3Tony Ah - I see you can select the output voltage as being VIN (I didn't spot that initially) - so I think that way I will be able to get 24v on Out1 and Out2 - so that should solve my fan issue. thanks

                                        1 Reply Last reply Reply Quote 2
                                        • undefined
                                          gnydick @dwuk3d
                                          last edited by 23 Jan 2025, 23:26

                                          @dwuk I just ended up getting blowers without tachs and wiring them up in parallel.

                                          undefined 1 Reply Last reply 23 Jan 2025, 23:27 Reply Quote 1
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