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    3 fans on tool board 1lc?

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    Duet Hardware and wiring
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    • gnydickundefined
      gnydick
      last edited by

      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?

      jay_s_ukundefined gloomyandyundefined 2 Replies Last reply Reply Quote 0
      • jay_s_ukundefined
        jay_s_uk @gnydick
        last edited by jay_s_uk

        @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

        gnydickundefined 1 Reply Last reply Reply Quote 0
        • gnydickundefined
          gnydick @jay_s_uk
          last edited by

          @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
          • gloomyandyundefined
            gloomyandy @gnydick
            last edited by

            @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.

            gnydickundefined 1 Reply Last reply Reply Quote 2
            • gnydickundefined
              gnydick @gloomyandy
              last edited by

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

              gloomyandyundefined 2 Replies Last reply Reply Quote 0
              • gloomyandyundefined
                gloomyandy @gnydick
                last edited by

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

                1 Reply Last reply Reply Quote 0
                • gloomyandyundefined
                  gloomyandy @gnydick
                  last edited by

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

                  gnydickundefined 1 Reply Last reply Reply Quote 0
                  • gnydickundefined
                    gnydick @gloomyandy
                    last edited by

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

                    gloomyandyundefined dc42undefined 2 Replies Last reply Reply Quote 0
                    • gloomyandyundefined
                      gloomyandy @gnydick
                      last edited by

                      @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
                      • dc42undefined
                        dc42 administrators @gnydick
                        last edited by

                        @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

                        gnydickundefined 1 Reply Last reply Reply Quote 0
                        • gnydickundefined
                          gnydick @dc42
                          last edited by gnydick

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

                          dc42undefined 1 Reply Last reply Reply Quote 0
                          • dc42undefined
                            dc42 administrators @gnydick
                            last edited by

                            @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

                            gnydickundefined 1 Reply Last reply Reply Quote 0
                            • gnydickundefined
                              gnydick @dc42
                              last edited by

                              @dc42 very true, very true.

                              1 Reply Last reply Reply Quote 0
                              • dwuk3dundefined
                                dwuk3d
                                last edited by

                                @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

                                jay_s_ukundefined gnydickundefined 2 Replies Last reply Reply Quote 0
                                • jay_s_ukundefined
                                  jay_s_uk @dwuk3d
                                  last edited by

                                  @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

                                  dwuk3dundefined 1 Reply Last reply Reply Quote 1
                                  • dwuk3dundefined
                                    dwuk3d @jay_s_uk
                                    last edited by dwuk3d

                                    @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 Reply Quote 0
                                    • T3P3Tonyundefined
                                      T3P3Tony administrators @dwuk3d
                                      last edited by

                                      @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

                                      dwuk3dundefined 2 Replies Last reply Reply Quote 0
                                      • dwuk3dundefined
                                        dwuk3d @T3P3Tony
                                        last edited by dwuk3d

                                        @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
                                        • dwuk3dundefined
                                          dwuk3d @T3P3Tony
                                          last edited by

                                          @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
                                          • gnydickundefined
                                            gnydick @dwuk3d
                                            last edited by

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

                                            dwuk3dundefined 1 Reply Last reply Reply Quote 1
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