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Might be able to use a flipper zero as the sensor, if the cats are chipped. Then you'll have data to catch any unusual usage, like a urinary blockage, before it becomes a serious problem! At that point you're a smart switch and Home Assistant script away from fan control.

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ahaucnx 9 days ago | parent | next [-]

I would recommend to use an TVOC sensor that detects smell very easily and then automatically switch on a fan. Could be a fun project.

Just need: - TVOC sensor like the SGP41

- ESP32 microcontroller

- Electric Relay

	▲	amluto 8 days ago \| parent \| next [-]
		I’m highly unimpressed by my couple of SGP41 sensors, but they would probably work for this application.
	▲	teruakohatu 9 days ago \| parent \| prev [-]
		Interesting idea. Do TVOC respond with enough signal to low level aromatics verses all the particles from cooking or pollution?

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kentonv 9 days ago | parent | prev | next [-]

Garply had a blockage once and he did a remarkably good job of communicating the problem to us directly!

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allenrb 9 days ago | parent [-]

As a fellow cat person, I feel pretty confident interpreting what’s being implied here. :-)

Beautiful home and contents, btw! It seems expensive but more than a few folks would have spent the same money on “nicer marble” or something.

	▲	kentonv 9 days ago \| parent [-]
		Heh, I actively dislike "nice marble" or anything that just looks expensive without providing any functional benefit.

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trebligdivad 8 days ago | parent | prev [-]

I did wonder where the network connections were going into the cat areas!