this post was submitted on 06 Mar 2024
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kind of Smart Kitchen Hood (lemm.ee)
submitted 1 year ago by rambos@lemm.ee to c/homeassistant@lemmy.world
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This is a followup of my last post where I was looking for a solution to our problem with smell coming from the kitchen hood (extractor) when neighobour is cooking. I got many good suggestions, but @Finlsolo963 pointed me to Shut-off Damper with motor that looks like perfect fit. I hope it can stop the smell completely in closed position and open automatically when we start using hood.

I was looking at this Damper

I could use Shelly Plus Plug S to detect power usage of the hood which trigers Shelly 2.5 to open Damper. After turning off the hood, power will go down and automation would triger another channel of Shelly 2.5 to close the Damper.

What do you think about the setup? Is there any better hardware you would suggest? I dont mind spending more for beter sealing when Damper is closed. I like the one from the link mostly because its 220V and I could use shelly relays which seems super simple to implement. I already own Shelly Plug S that I could use, but its not a must. Im also opet to zigbee devices.

Bonus question: what would happen if something goes wrong and both channels of Shelly 2.5 triger at the same time? It would be like pressing Open and Close buttons at the same time.

Thanks in advance

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[–] h3ndrik@feddit.de 1 points 1 year ago* (last edited 1 year ago) (1 children)

No, I mean for the input sensing. To see if someone pushed the switch for the hood... The shelly 2.5 has 2 outputs and 2 additional inputs for switches. You cant't control a third device. But you can measure if there's mains voltage on 2 additional inputs. If wired correctly to the switch of the hood... You can detect if it's on and control the 2 damper channels all with one shelly 2.5

I think the 2 outputs are like controlling blinds. That's a fairly common use-case for something like a shelly 2.5 and should work fine.

[–] rambos@lemm.ee 2 points 1 year ago (1 children)

Ah I see what you mean. It would be cheaper if I dont need a 2nd device, but our hood has 3 position switch for different speeds. Its probably still posible to wire it somehow, but I dont know is it worth to mess around with the wiring and avoid warranty while 20€ device can make it more simple

[–] h3ndrik@feddit.de 1 points 1 year ago* (last edited 1 year ago) (2 children)

Yes, it's probobly not worth it. I wouldn't know how to wire it to a 3 position switch, that's not easy.

I just included the idea because it could be a cleaner solution. I mean there are edge-cases. For example with your setup, you can't cook while the Wifi is down. That might or might not be a concern.

[–] rambos@lemm.ee 2 points 1 year ago (1 children)

Thats true, but I would also add a manual rocker switch for that case. Better option would be custom electronics (like arduino or simmilar) that trigers without homeassistant, but thats probably too complex for my knowledge...maybe in the future, but first I need to find a working solution

[–] h3ndrik@feddit.de 1 points 1 year ago

Sounds good. Usually the simpler solutions are best. At least around the house in my experience.

[–] claude_flammang@dju.social 0 points 1 year ago (1 children)
[–] h3ndrik@feddit.de 1 points 1 year ago

That'd be the easiest solution. But I think it won't work with this specific hardware, as it needs to close the damper with a separate 10s(?) pulse after the exhaust hood turned off.