I want to have a chart that tracks humidity - from a sensor emitting a value on MQTT on topic bathroom/humidity and I want to show a threshold value on the same graph. On my NodeRed Dashboard2, I have a settings tab, where I can set a trigger threshold between 60% & 100% and I store that as a global.
This is a cutdown version of my flows, keeping it to the salient parts
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Is this the way to do it, or are there more efficient ways?
I assume the 30s repeat inject will re-query the stored value and feed that in to the graph as another series (as I set msg.topic = bathrooom/humidityThreshold, as well as passing msg.payload
