Loxone tree humidity sensor bathroom

[Luc]

For our bathroom we will  install a presence detector on the ceiling, but this will not work when showering due to the glass door. 

The room however will have a tree touch switch, so I was thinking we could use the humidity to detect someone is showering. My only worry is that the sensor will respond too slowly and the room will be dark ;) Has this been done before ? Thoughts, ideas ?

[seb303]

Sounds like it should work.  You probably just need to set the presence timeout long enough so that the humidity level has time to build up.  Depending how stable your normal indoor humidity level is all year round, you might need to respond to relative level rather than absolute value.

You could also try positioning the presence sensor near enough to the shower that it 'sees' over the top of the shower door.

[Duncan]

if you are detecting presence to turn on the lights then you need instant response when a person enters the room, so a presence/pir detector at the room entrance will be necessary to turn on the lights

the timeout for presence detector would normally turn the light on for a set period, so if in the shower it cant see a person, you would need to set the light timeout long enough to finish a shower then move out of the shower cubicle - say 15 or 20 minutes, or as previously mentioned position the sensor so it 'sees' the showering person and set a shorter timeout say 5 mins - but what happens when a person lies still in a bath for 1/2 hour?

a change in humidity could prolong the lights on period, but it probable the person will have left before the humidity drops again, so the presence detector should drive the lghts and humidity detector drive any additional ventilation requirements

humidity detection doesnt need to be that precise - an average humidity of <50% will inhibit mould growth, so it could be done with a simple timer on the basis of boosting ventilation for a while after the 'usual' shower use.

[David]

Hi,

I had the same problem, so I installed a Loxone Temperature Probe 1-Wire strapped to the hot water pipe going to the shower mixer. 

When I see an increase above 30 degrees I create a movement pulse.

Works very well and I never shower in the dark!

Cheers David

[seb303]

On Monday, May 29, 2017 at 9:20:48 AM UTC+1, David wrote:

I had the same problem, so I installed a Loxone Temperature Probe 1-Wire strapped to the hot water pipe going to the shower mixer. 

When I see an increase above 30 degrees I create a movement pulse.

That's a good idea :)
I think I'll retrofit that in our house ... fortunately each shower has its own hot water feed from the plant room where there happens to be a 1-wire bus available.

As a workaround currently, I have set the light wall button to activate a longer on-time (MT=30mins) compared to the presence sensor on-time (TH=3mins).  The other workaround is to wave your hand over the top of the shower door when the lights switch off! ... in hindsight I should have mounted the sensor much nearer the shower as it's only a small room so would still have easily covered the entrance door.

[DavidL]

You could always plumb in a flow sensor for the water pipe(s).

https://www.rapidonline.com/Catalogue/Product/61-1358

David