Rainbow Effect directly in Node-RED for RGB Spots

General
1

Hey guys,

I have a new setup in my flat with some Hue RGB SpotLights connected with a conbee stick/bridge.
Everything works great, I can set the colors with the Colorpicker and the brightness and so on.

I don't have any Idea how to realise a smooth fading rainbow effect on these lights if I choose such an effect in a dropdownlist on the dashboard.
Every function node is sending one msg and will stop after "return msg".
F.e.

If I code my Rainbow with a "for loop" and in this "for loop" I have one "return msg;" it will stop the for loop :confused:
So how is the best way to get a solution for this? Delaynode after function node that is connected to the Input of the function node?

Thank you all in advance.

2

Please look it up in the documentation.
You can use node.send in a loop.

1 Like
3

mhhh @bakman2 looking around the docu but can't find anything that belongs to node.send.

EDIT: ok got it... last post I clicked on I found it => for everyone else that is looking for it as well => https://nodered.org/docs/user-guide/writing-functions

4

Mhhh, tryed it with the node.send but node-red seems to freeze realy often and now I did it this way:

image
image825Ă—114 7.9 KB

the button is for turning on / off the Rainbow Effect and the 1st function node looks like this:


if (rainbow) {
    flow.set('rainbowOn', false);
    msg.effect = "Start Rainbow";
} else {
    flow.set('rainbowOn', true);
    flow.set('inta', 0);
    msg.effect = "Stop Rainbow";
}
return msg;

and the 2nd function node like this:

var rainbow = flow.get('rainbowOn');
var inta = flow.get('inta');

if (rainbow) {
    inta++;
    if (inta >= 361) {
        inta = 0;
    }
    flow.set('inta', inta);
    return {
        hue: Math.floor(inta/360*65536)
    };
}

the limiter is for a smooth transition.

5

but node-red seems to freeze realy often

Ofcourse: you are creating loops.
The hue api has an option for an effect which could be a rainbow as well.

6

found this: http://rsmck.co.uk/hue

colorloop as effect <3