this post was submitted on 22 Aug 2023
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Automation based on brightness (discuss.tchncs.de)
submitted 2 years ago by monolift@discuss.tchncs.de to c/homeassistant@lemmy.world
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So, I want the following to happen, does anyone have any advice the best way to make the conditions in HA?

If it’s bright outside, close the blind and turn on the light If it’s dark outside, close the blind and turn on the light If it’s anywhere in between, keep the blind open - if it’s ‘dark enough’ turn on the light as well.

I haven’t bought any lux sensors yet. I do believe it’s a lux sensor I need. Can I make this automation with 1 (pointing outside and using that value to control both the light and blind) or would I need to have 2? (I assume, one pointing outside controlling the blind, the other in the room controlling the light?

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[–] Nimrod@lemm.ee 1 points 2 years ago (1 children)

In my experience, aqara motion/lux sensors are pretty binary. I have one in my greenhouse to help with my lighting, but the lux value goes from 0 to max when ANY amount of light hits it.

There is no way I can tell the difference between cloudy and sunny. I can’t tell the difference between 6am (sun just over the horizon, but still behind trees) and 12 noon.

I would love to be able to detect when the sun goes behind a tree and shades my garden, but that’s just not possible with the granularity of the data I’m getting.

[–] EyesEyesBaby@lemmy.world 1 points 2 years ago* (last edited 2 years ago)

My aqara lux sensor actually works pretty well, but I use it to determine when it gets dark; not if it's cloudy or not.