I have a number of flows that use the state of some global variables to decide what to do when certain triggering events happen. For example I have a flow that sets my slack status to "waiting on the bus" when the garage door opens in the morning (because I always retrieve my bike from the garage to…

One way I would solve this by polling the values you are interested in by a repeating inject node trigger a switch or function node. I don’t know of a callback you can place to avoid polling. For notifications I would use a messenger of your choice to get the information on your favorite device.

Another way is to keep them in Retained topics in MQTT, then whenever they change they automatically tell any nodes that need to know that they need to do something. If the retained value is needed in conjunction with another value or event then you can use a Join node (probably in key/value pair mo…

Hmmm... I'm not sure I understand. Perhaps I've not described what I need very well and you're solving a different problem than the one I'm asking about? I don't need notifications. The global variables are doing their job correctly. I just want an easier and more accessible way to see the states…

I have edited my post to try and make my description clearer.

Do you just mean you want a node red dashboard indicator showing the current status?

I think I read it correctly. I would use an inject node that triggers every 1 minute for example. [image] Then a function node reading the state of the variables and do what ever nessesary or a switch node: [image] followed by a change node [image] and then a messanger node like telegram […

OK, then my confusion (I believe) is perhaps regarding an assumption. Such as, an assumption that I know how LEDs work? Thinking back to a year or so ago, when I first got my Pi, I did write and run a sample LED python program to give my breadboard a whirl. So... what is telegram sender sending me…

With the led’s i could perhaps help. I would use a array of individual addressable led’s know as neopixel (rgb or rgbw).in your case mounted on a pcb lime this: [image] You can find a lot of instructables how to connect them to a raspberry but perhaps you like to have them on a remote location t…

Or are you running on a Pi and just want to light LEDs attached to GPIO pins? In which case you can send a 1 or a 0 to the pin to drive the led directly.

Indeed - I've no idea what Telegram is doing here... If you use the inject to feed several change nodes - each set to move global.{your_variable} to msg.payload then feed a node-red-contrib-ui-led node for each... you should be able to configure the ui_led node to indicate a colour based on on and…

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How to track status of global variables (and some nodes)?

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dynamicdave 15 January 2020 17:59 15

If it helps - here's a link to my tutorial on controlling a NeoPixel strip from Node-RED via a Wemos D1 mini (ESP8266 flashed with ESP Easy).

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How to track status of global variables (and some nodes)?

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