LED RGB Strip wiring Duet

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AS-3D Druck
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Joined: Sun Jul 30, 2017 12:31 pm

LED RGB Strip wiring Duet

Post by AS-3D Druck » Sun Jul 30, 2017 12:48 pm

Hey Guys,

i've got a Question about the wiring of the Duet with this type of LED RGBs.

I know Tom made a Video about this but this LED RGB Strip got (i belive) different inputs.

Here is the wiring Diagramm of the Duet:

Can anyone help me?
Mit freundlichen Grüßen

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Joined: Sun Sep 17, 2017 8:51 pm

Re: LED RGB Strip wiring Duet

Post by RobSmith » Sun Sep 17, 2017 11:23 pm

I see that this post is relatively old, but I also didn't see any replies, so just in case you're still looking for advice:

1) You'll definitely have to repurpose pins, see https://duet3d.com/wiki/Using_servos_an ... d_I/O_pins for details

2) You'll also have to find a way to ensure that the relatively low-voltage signals (3.3V-ish, maybe 5V, iirc) that come out of the Duet's pins are within the useful range of your LEDs... ie, mosfet, relay, etc.

3) While PWM is almost mandatory for full RGB control, it's unlikely that you'll be able to repurpose enough PWM-capable pins without sacrificing essential systems (ie fans, heaters, etc) (assuming you don't have an expansion board).

Theoretically speaking, you could use a single PWM channel to produce a spectrum of colors, using an HSV model. Of course, you'd have to assume that (S)aturation and (V)alues are fixed at 100%, but then you can define the (H)ue with the PWM... While this is pretty straightforward with a microcontroller (http://tinyurl.com/ydavdg9j), a purely analog circuit is possible, but is definitely not trivial(https://i.imgur.com/oSKEO3L.png).

If you're willing to live with something simpler, you can get 7 colors with 3 channels of digital (on/off) control (red, green, blue, yellow, cyan, magenta, and white). In that case, you'll have a slightly larger set of pins to choose from, but you'll still need a higher-voltage source for the LEDs.

I hope this helps!

Tomasz Stawarz
Posts: 39
Joined: Sat May 27, 2017 3:27 pm

Re: LED RGB Strip wiring Duet

Post by Tomasz Stawarz » Sun Sep 24, 2017 7:42 pm

As far as I remember you don't need expansion board to use expansion board pins. Or am I completely wrong?

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Joined: Thu Feb 15, 2018 11:15 pm

Re: LED RGB Strip wiring Duet

Post by GSVNoFixedAbode » Thu Feb 15, 2018 11:19 pm

Hi All,
Has anyone wired up the LEDs on an Anycubic I3 Mega yet? I'd be interested to know what pins are available on the board (V3 unit, V1.1 firmware).

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