I'm new to Node-Red and I think there is something about flows or RBEs that I don't understand, and need some help figuring out.
As the subject suggests, I expect this flow to turn the lights off when the sun goes above a certain elevation, and turn the lights on when it goes below a certain elevation.
The flow takes the sun elevation from Home Assistant and has two branches. One branch
- emits 1 if the sun is more than 2 degrees above the horizon, otherwise 0.
- RBE that blocks until its input changes by >= 1
- When the RBE is unblocked, turns off the lights.
The other branch is essential the opposite (emit 0 if the sun is more than 2 degrees above the horizon, etc.)
What I don't understand is why both RBEs are unblocked when the sun angle goes above or below 2 degrees. The RBE to turn off the lights unblocks first, then within a minute the RBE to turn on the lights unblocks.
I realize I could solve my problem using different nodes, or add additional conditions as a workaround, but I would like to use this approach to improve my understanding of how Node-Red works.
Help much appreciated!
Sun high enough: msg.payload = (msg.data.attributes.elevation < 2) ? 0 : 1 ; return msg
Sun low enough: msg.payload = (msg.data.attributes.elevation < 2) ? 1 : 0; return msg
Time to turn on is identical to time to turn off
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