Bathroom lights and fan

I’m getting our bathroom rewired and having an extractor fan installed - I would like it to:

  1. Automatically turn on the lights when someone walks in between sunset and 11pm, and turn them off after no movement in x minutes.
  2. Automatically turn on the lights at 20% when someone walks into the upstairs hallway between 11pm and sunrise, and turn them off after no movement in x minutes.
  3. Allow people to manually turn on the lights outside of these times.
  4. Control the extractor fan using similar rules.

I guess the best thing for the lights is a Fibaro in wall dimmer and motion sensors in bathroom and hallway, but what would you recommend for the extractor fan?

As long as you just need an on/off switch, not variable speed, any in wall micro relay that can handle the amperage of the extractor fan should be fine. These will, however, require a neutral wire. But if you’re having the wiring done now that shouldn’t be a problem.

There are several zwave brands available for the U.K., including fibaro

Just don’t get a dimmer version. Dimmers will be spec’d only for control of lighting, not for control of motor devices like fans. But as long as the device says it can handle appliances and it can handle the current draw for your particular fan you should be fine.

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THANKS so much for that, really helpful. Few extra questions:

  1. Both you and @JDRoberts recommended the relay over the Double Switch 2 - how come? (sorry if this is a stupid question!)
  2. I hadn’t thought of triggering the fan from the lights like that, that’s cool. Is there a reason why you didn’t give the fan its own switch though?
  3. Is there anything you’d do differently?

Thanks again.

Yep, will have an isolator switch as described, and the light switch will be on the wall on the way in to the bathroom (and hopefully won’t need to be used much anyway).

Good idea to have a Xiaomi button in the bathroom for the fan, think I’ll do the same and forego having two switches as I can see it causing confusion. Do you have any issues with the first press not registering though?

Humidity sensor sounds interesting, but like you I’ll look into it afterwards. Thanks for your help!

My piston for extractor fan is below. We always shower with light on as only have a small window in ensuite. So switching light on sets a humidity level above which fan goes on.

When light switches off fan stays on for 5 minutes which is long enough for humidity to be lowered

I have a xiaomi temp/humidity sensor in ensuite, fibaro dimmer module controlling lights and a fibaro relay on fan

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Can anyone help suggest a solution to try and make the light and fan smart? I have purchased a Fibaro FGS 212 Relay Switch and would like to control both the fan and light with it. I don’t mind about using a physical light switch and can leave this on all the time providing the fan and light and be turned off with the Fibaro. Thanks for any knowledge!


If I want to be able to dim the bathroom lights and control my fan will I need both Fibaro Double Switch 2 and Fibaro Dimmer 2?

Dimmer 2 behind the light switch, Double Switch in the loft connected to the fan?

After the lights have been on 1 minute the fan will come on until the lights are turned off.

How easy is it to set up the control of this, mainly the fan knowing when to come on?

Thank you, I will give that a try.

I need a very simple WebCore code.All I want is automatically switch off my closet light , 5 minutes after turn the light on
I not familiar with WebCore programming, can you please help ?

If Light is On
Then with Light
Wait 5 Minutes
Turn Off

Some of my closets I have contacts
If Contact Changes to Open
Then with Light
Turn On
If Contact Changes to Close
Then with Light
Turn Off

Some of my closets I have motions
If Motion Changes to Active
Then with Light
Turn On
If Motion Changes to Inactive
Then with Light
Wait 2 Minutes
Turn Off

Some of my closets I have a combination of motion and contact
If Contact Changes to Open
Then with Light
Turn On
If Motion Stays Inactive for 5 Minutes
Contact is Open
Then with Light
Turn Off

This looks really great. But I have only little knowledge in writing code for WebCore. Can you please generate a screen capture which i can copy and paste and only change to my Switch names. Please… :pray: