DEMO: multiple devices (pickable via a dropdown) feeding single gauge
Prerequisites: this flow uses node-red-contrib-random
This is a simple demo showing how you could have a single dashboard page with one gauge and a dropdown that is used to select which device is sending data to the gauge.
The three devices are simulated with inject nodes connected to random nodes connected to a change node that sets msg.topic to the unique device name. The random node for device 1 generates numbers between 1 and 10, the random node for device 2 generates numbers between 11 and 21, the random node for device 3 generates numbers between 20 and 31.
The msg from all three devices are then passed to a switch node that checks the msg.topic against a flow variable that is initialized to device1 and is changed by selecting a device from the dropdown. Only msgs that match are passed on.
The gauge displays numbers between 0-10 will display in the green color range, 11-20 in the yellow range and 21-30 in the red color range to give a visual clue to which device is reporting the data along with the label of the gauge changing to the device number.
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