Created small how-to on Duex5 - 12v Switching Regulator for LED

  • I wrote a small post on using the Build in 12v Switching Regulator on 24v System on a Duex5 to power/control LEDs.
    It can obviously be used for other things, but the main point is how to use this feature, written in a basic non-technical fashion, making it useable for everyone to get started.

    I put it on Instructables here, where they featured it!

    I use my blog as a sort of draft-posts for instructables, where I put together and boil down the posts in the end, and put on instructables

    I've inserted the small post here for easy usage by people:


    • Use Duex5 to get 12v

    • Jumper settings

    • Configure LED in firmware

    • Further customization options

    • All done

    [h]Use Duex5 to get 12v[/h]

    As far as I know the Duex5ย (also in Duex2) is the only Controller or Expansions -board for 3D Printers with build-in 12v switching regulator, which means you can easily get 12v even if you use a higher voltage to power your machine (VIN Power - opens Duet3d Glossary) without having to restort to various step-down modules lying around in or outside your printer creating potential for shorts and other errors.

    [h]Jumper Settings[/h]

    In order to activate this 12v switching we need to:

    • Put a jumper on the pins marked with nr. 1

    • Check the FAN jumper nr. 2 is placed on the 12v position

    • I'm going to use the FAN3 Connector marked with nr. 3 for my LEDs

    In case you have difficulty seeing the colors as me, being colorblind, the + wire is to the right side of the 2-pin connector, and - wire on the left side.

    Image is part of the original conenctions diagram on Duet3D wiki.

    You can also see the full diagram here:

    [h]Configure LED in firmware[/h]

    We really just need to open the Config.g file and insert a small line under the other fans in our FAN section, like this:

    M106 P3 S1; Set fan 3 value for our LED to on.
    ```It really just put FAN connector 3 on full power.
    Further customization options
    We can put the power to the LEDs on half (dimming it) by setting S to 0.5 instead of 1, or use the 0-255 range if that's more to your liking.
    It also means you can control it using Gcodesย to do different things like turning LED on when a print starts and turn it off when a print job ends or what ever you like.
    [h]All done[/h]
    Here you can see the new jumper on nr 1, set jumper on nr 2 and our LED connector on nr. 3

  • administrators

    Great thanks! I will add it to the tutorial section of the wiki

  • Nice set of stuff on your blog too - great ideas. I like 'overengineered' ๐Ÿ™‚

  • @T3P3Tony:

    Great thanks! I will add it to the tutorial section of the wiki

    Thanks ๐Ÿ™‚
    Working on a similar post about BLTouch for us electronics-component and datasheet -morons ๐Ÿ™‚

  • @robm:

    Nice set of stuff on your blog too - great ideas. I like 'overengineered' ๐Ÿ™‚

    Thanks ๐Ÿ™‚
    The BeTrue3D Printer is what I call a concept printer where everything is rather much overkill or at least some of the best I could scrape together.

  • Thanks for clarifying when I looked at the schematic I actually wasn't sure if I need jumper in the pin you circled as number 1 to use the built in 12v. Now I know thx i think the schematic could use more clarification on that 12v jumper

  • Really good staff on your blog. thanks for sharing

  • BTW, the Replicape also have an onboard 12V regulator, for fans, so you can use a 24V power supply for motors.

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