Rgb led connection

gbiski

I want to use a rgb led strip in order to change colors according to the printing status and temp of nozzle - bed on the duetwifi (I have also connected the due2).
The input power on duet is 24v but the led is 12v.
I think that the led strip is "common anode" because it has a common positive and 3 neutral.
I have also a Buck Step Down Converter Module to reduce voltage,
What do you suggest to do as connection and what code to use ?

Is it safe to connect the positive and negative of the input of the buck step converter to the + and - of an always fan on the duetwifi and have the 3 negatives (colors) of the Led strips to the negative of the 3 pwm fans on due2 and the positive of the led strip to the positive Out of the buck step converter ?

dc42

@gbiski said in Rgb led connection:

Is it safe to connect the positive and negative of the input of the buck step converter to the + and - of an always fan on the duetwifi and have the 3 negatives (colors) of the Led strips to the negative of the 3 pwm fans on due2 and the positive of the led strip to the positive Out of the buck step converter ?

Yes.

gbiski

@dc42 Thanks a lot for your help. Then I will use M106 to set colormix and brightness ?

dc42

@gbiski said in Rgb led connection:

@dc42 Thanks a lot for your help. Then I will use M106 to set colormix and brightness ?

Yes, or you can redefine those as GPIO outputs and use M42 instead.

gbiski

@dc42 I connected it and everything is working nicely.
The rgb strip states 15watt per meter and i installed 1 meter.
The Buck Step Down Converter states:
Output current: 2 A continuous output.
Output power: the maximum 15W
Guaranteed 3A output load current.

Do you think is safe the installation for Duet and back step point of view ?

dc42

Is the 15W/metre the total if you turn all three colours full on, or is it per colour?

If it's the total then you are OK. If it's per colour then the Duet is OK but you will overload the buck regulator if you turn 2 or 3 colours on simultaneously.