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

[dintid]

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!
https://www.instructables.com/id/Duex5-Use-Build-in-12v-Switching-Regulator-on-24v-/

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
https://betrue3d.dk/blog-posts/

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

[h]Index[/h]

• 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 Duex5 (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:

[[language]]
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 Gcodes 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
[![](https://i2.wp.com/betrue3d.dk/wp-content/uploads/2017/06/12vLED-e1497188774532.jpg?resize=300%2C263&ssl=1)](https://i2.wp.com/betrue3d.dk/wp-content/uploads/2017/06/12vLED-e1497188774532.jpg?ssl=1)

[T3P3Tony]

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

[robm]

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

[dintid]

@T3P3Tony:

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

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

[dintid]

@robm:

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

Thanks
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.

[stephenc]

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

[Motalw]

Really good staff on your blog. thanks for sharing

[fma]

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