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Ideas for shower / humidity / fan automation?

Ideas for shower / humidity / fan automation?

TLDR: I was a little puzzled about that, I thought I would ask Hive Mind. I have an Aqara water / drain sensor and an Onvis motion / humidity sensor to throw away the problem (plus I’m happy to buy anything, but I doubt there’s anything to help). The ventilation fan + light are controlled by the Cassette. I can install HomeBridge if I need dummy switches. Longer version: I have a shower room with (sighed) no windows. I replaced the outlet and would like to set up an automation to keep it running until the humidity drops to a reasonable level (in my area, maybe 50 years / 60 years). But, like most true automations, no matter how smart they are, there are always one or two corner housings that would make it behave unwanted (for example, you can’t just use simple moisture because it could ignite ventilation + light in the middle of the night or turn it off in the middle using the bathroom) Basically what * they * want is: 1. Detect when someone is taking a shower (leak sensor?) 2. When “the shower has been detected”, keep the fan running until when the humidity drops below X (say, 60%). 3. If the vent is turned off manually, don’t bother and reset everything at the beginning Any ideas? Does anyone do something similar? Thanks!