this post was submitted on 14 Jul 2023
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alert when aqara temp sensors outside go above or below temp sensor inside (lemmy.world)
submitted 1 year ago by june@lemmy.world to c/homeassistant@lemmy.world
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Wondering if this is possible. A quick look through the automations and scenes didn’t pop anything out for me, but it would be nice to know when to open and close my windows throughout the summer based on actual local temp now that I’ve got a couple of the Aqara sensors outside.

The idea is that when the temp on both of the outdoor sensors goes below the temp on the inside sensor, in the afternoon/evening, I’d get an alert to open my windows.

And in the morning I’d like an alert to close my windows when the outside temp and inside temp are the same.

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[–] SeriousBug@infosec.pub 5 points 1 year ago (1 children)

Have you tried the "numeric state" trigger? It lets you trigger an automation if one numeric entity is higher or lower than another one.

[–] june@lemmy.world 2 points 1 year ago (2 children)

I’ll take a look. Thanks for the suggestion!

[–] Styxia@kbin.social 3 points 1 year ago* (last edited 1 year ago)

In isolation a temperature sensor can be “flappy”, so you may want to try and smooth the data to avoid hysteresis. I use the statistics integration to help improve the quality of my sensors.

Have a read of this for inspiration:
https://community.home-assistant.io/t/thermostat-with-hysteresis-smoothing-factor/72729

Using this you would create a calibrated sensor which you would use for automations as SeriousBug suggests.

[–] limelight79@lemm.ee 2 points 1 year ago* (last edited 1 year ago)

Styxia@kbin.social suggested statistics to smooth the numbers out. I can't reply to his comment for some reason, so I'm trying to reply here: Another option to avoid that issue would be to have the automation check that a > b for 2 minutes, or something like that.