Help with Bathroom Fan Scene With Humidity Check

[marstonstudio]

Does anybody have a bathroom fan scene/automation based on humidity that works well?

I have a bathroom exhaust fan tied to an aqara smart switch, and in the room I have an fp300 humidity sensor.

I’d like to make a scene that does the following

• run the fan automatically for 15 minutes
• at the end of 15 minutes begin a loop for a maximum of 8 times
  • if the humidity is above 40%, stay on for another 5 minutes

I had tried making an automation to automatically turn the fan on when the humidity rises above 40%, but I found it was triggering when nobody was in the bathroom. That’s part of why I want it to be a scene.

Extra bonus if instead of just checking the one sensor humidity, I could instead make it compare the value with a humidity in another room. “if the bathroom humidity is 10% higher then the bedroom humidity, stay on for another 5 minutes”

Any experts out there with guidance on how to do this scene using the Aqara Automation? If you have something that works I’d appreciate a screenshot or the detail on exactly what the automation settings you used that worked well.

[cezary806]

The way I see it:

1. Create an automation

WHEN
The switch (fan) turns off

AND
FP300 humidity above 40%

THEN
Turn the switch (fan) on
Delay 5min
Turn the switch (fan) off

2. Toggle “Trigger once”.

3. Clone this automation 7 times. You should have 8 automations (every one of them should have “trigger once” enabled).

4. Edit each automation (except for 8th one). Each automation should ENABLE the next automation. For example, automation 1 should have

THEN
Turn the switch on
Enable automation 2
Delay 5min
Turn the switch off

Automation 1 should enable automation 2, automation 2 should enable automation 3 etc. That’s how we will simulate a finite loop.

5. Disable ALL of the 8 automations.

6. Create a scene.

Turn the switch (fan) on
Enable automation 1
Delay 15min
Turn the switch (fan) off

Btw I also recommend installing a smart thermostat (like the W600) in the bathroom. If the FP300 senses high humidity (55+%), increase the temperature by 3-4°C so the air will dry faster. Make the temperature go back to normal when the humidity drops below 50% (a 5% hysteresis should be appropriate in this case, the radiator will be still hot at 50%)

[gafich10]

Hello, welcome to the forum. In lesson 6 (Figure B) I described working automation for controlling humidity in the bathroom. If you have any questions, write, I will explain everything.

Automation 2.0, lesson 6, bathroom automation on a working example

Lesson 5 Automation 2.0, Lesson 5, vector lighting control by sensors Good afternoon, today I want to raise the topic of automation in the bathroom. This automation configuration was developed over the years, along the way of the idea and the need for use. Maybe someone will use some part of the lesson. Let’s start a topic that will consist of the following sections: lighting; ventilation; towel warmer control. Figure A shows a diagram of the device placement. Figure A. [IMG_20251008_2054…

[marstonstudio]

I will try these approaches, thank you

[nzjrs]

Fwiw in east of England, Victorian era house, I have my humidity trigger at 75%.

[LLGuapo]

I run my house off of Apple home this is pretty much my set up…The bathroom fan stays on until humidity drops to 54% not sure what platform you run yours with but I hope it helps