hello, taking my first steps into Node-RED, I'm running into what seems a simple problem. I have an existing home automation system that outputs a JSON string with the status of every light in the house. The output looks like this: { "L1":0,"L2":1,"L3":0,"L4":0 }.....and so on Using Node-RED dash…

I've actually discovered an easier way to achieve this .... using a functions with multiple outputs. This 'splits out' the incoming JSON strings into separate outputs. the function is like this: var r1 = {payload: "P47."+(msg.payload.L_slpk3_dressing)}; var r2 = {payload: "H33."+(msg.payload.L_…

Hi zenofmud, thanks for the reply. You can select JSON from the dropdown menu, on every line: [image] The behaviour of the led works fine with msg.payload type set to "string" or "boolean" And I been thinking of using that, but then I'm not sure what's a good way to split out my JSON string into…

Well it looks like you can send in json, but the entire json object has to match. i.e. it you send { "L1":0,"L2":1,"L3":0,"L4":0 } then that is what needs to be in the node for the color you want. Sounds like a great request to the author of the node or better yet, you should code up a fix and su…

Yes it seems so, I tested it too, and the string needs to match exactly for the LED to light up. That pretty much renders it useless for JSON input :slight_smile: I'm unable to change the code myself. I'll contact the author. Any suggestions for a workaround, or other ways to acheive this? thank…

Can you feed your JSON string into a debug node and show us exactly what the debug node outputs please?

Hi Colin, this is the input: { "L1":0,"L2":1,"L3":0,"L4":0,"L5":0,"L6":0,"L7":0,"L8":0,"L9":0,"L10":0,"L11":0,"L12":0,"L13":0,"L14":0 } and this is the debug: [image]

The message payload shown in the debug is not a JSON string, it is a javascript object. If you wish to use the L1 value then that is referenced by msg.payload.L1, so if you use a Change node to Move msg.payload.L1 To msg.payload then you can test the payload value directly in the led node.

Here is one way you could do it. set each LED to turn on/off based on a boolean true/false. Feed your input to a change node that looks like this: [Screen Shot 2020-01-07 at 9.49.27 AM] You will have to have one set for each LED. This will test the item in the object and set msg.ln (n being the n…

thanks Colin .. I'm probaly mixing up JSON & javascript object. Unfortunately the same issue exists with the led in both cases.

zenofmud, THANKS , it works!!!!

What issue? Show us how you have configured the change node and the led node.

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Simple JSON input string to LEDs on dash

General

deelerke 7 January 2020 16:04 19

ah Colin, that's exacly what i was wondering thanks!

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Simple JSON input string to LEDs on dash

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