In order to keep each of my projects separate and easy to edit, I have created two flows in node red. One generating external temperature data and the other internal temperature data. In a third flow I am trying to create a graph which combines the other two sets of temperatures together with two …

The chart node creates different lines for different topics. So you'll need to manage topics correctly and then you probably don't even need third flow (if you don't need to do some other fancy stuff before charting the data)

[image] hotNipi: . So you'll need to manage topics correctly and then you probably don't even need third flow (if you don' Sorry I don't understand. I can create a standalone graph with random data containing two sets of lines. What I need help with is a function (I think) to combine the tw…

Thanks for pointing that out:-) [{"id":"b6e2b6b7.80539","type":"function","z":"257ed035.563748","name":"2 line chart","func":"var msg = {};\nvar msg2 = {};\nmsg.payload=global.get(\"DarkSky\").currently.temperature;\nmsg.topic = 'External';\nmsg2.payload = global.get(\"Mysql Heatmiser\").string[4];…

You can not have space in Object property name. "Mysql Heatmiser" is not valid name. See node-red log, it should log the errors

Not sure whether spaces are allowed there or not. You can have spaces in property names but then you have to use myobject["some name"] to access it rather than the dot notatation. I would have expected it to work ok in context variables, though I haven't tried it. Put a debug node showing the mes…

[image] Colin: I would have expected it to work ok in context variables, though I haven't tried it. I tried. With no success.

I see you are right. I wonder why. Perhaps the implementer just did not think of that possibility. Objects can certainly have property names with spaces.

Well it is kind of bad practice anyway. If you are creating variables, you can create them in the way it does not lead you into some kind of trouble afterwards. But lets keep the topic clear for the main issue.

In the end this worked for me - set up two global variables elsewhere - intTempC and extTempc Then [{"id":"2afdd8e9.d5149","type":"inject","z":"257ed035.563748","name":"","topic":"","payload":"","payloadType":"date","repeat":"300","crontab":"","once":false,"onceDelay":0.1,"x":130,"y":300,"wires":[…

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2 flows data combined into 1 graph

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hotNipi 27 May 2019 11:48 4

Read this How to share code or flow json and edit your previous post to make the code part importable

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2 flows data combined into 1 graph

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