# Detection of sudden increase in RH

**URL:** <https://community.homey.app/t/detection-of-sudden-increase-in-rh/69693>\
**Category:** Questions & Help\
**Tags:** advancedflow\
**Created:** [October 1, 2022, 11:35am UTC](https://community.homey.app/t/detection-of-sudden-increase-in-rh/69693 "2022-10-01T11:35:26Z")\
**Posts on this page:** 4\
**Page:** 2

<div class="post-metadata">

**Author:** ![dsdevries](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/dsdevries/32/80220_2.png) [@dsdevries](https://community.homey.app/u/dsdevries)\
**Post date:** [January 9, 2026, 1:57pm UTC](https://community.homey.app/t/detection-of-sudden-increase-in-rh/69693/22 "2026-01-09T13:57:21Z")

</div>

if you really want to reliably check for the usage of the shower, you could also install a water flow sensor in the warm water line leading to the shower, or install occupancy sensors inside the shower.  
You could for instance connect this sensor to a Fibaro smart implant:

> **[Water Flow Sensor 1/2, G1/2" Copper Hall Effect Liquid Water Flows Sensor Switch...](https://www.amazon.nl/-/en/Sensor-Copper-Effect-Liquid-Switch/dp/B093DCTPD5)**
>
> Specifications: Condition: 100% Brand New Material: copper Color: shown as picture Type: G1 / 2" (external thread diameter), DN20 mm Water quality requirement: ≤60℃ Starting current range: 1.5 L/min Flow Range: 1-30L / min Maximum water pressure:...

[https://www.fibaro.com/nl/products/smart-implant/](https://www.fibaro.com/nl/products/smart-implant/)

---

<div class="post-metadata">

**Author:** ![Sander\_Bakker](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/sander_bakker/32/80078_2.png) [@Sander\_Bakker](https://community.homey.app/u/Sander_Bakker)\
**Post date:** [January 10, 2026, 8:32am UTC](https://community.homey.app/t/detection-of-sudden-increase-in-rh/69693/23 "2026-01-10T08:32:33Z")

</div>

This is the flow i use.  
Using the humiditysensor of my Itho box and depending on tempature it starts on middle or high modus after a sudden increase of humidity.  
After a sudden increase the humidity value of 2 minutes ago is written to a variable, when the RH comes close to this value it goes to low mode.

 ![image](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/e/e/ee03b6deb53c7061d455b331c530fc8f01bb17e6.png)

---

<div class="post-metadata">

**Author:** ![Joost\_Else](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/joost_else/32/17360_2.png) [@Joost\_Else](https://community.homey.app/u/Joost_Else)\
**Post date:** [January 10, 2026, 8:47am UTC](https://community.homey.app/t/detection-of-sudden-increase-in-rh/69693/24 "2026-01-10T08:47:02Z")

</div>

> [@Esben](#):
>
> So I am wondering: Did you manage to find a good solution?

Well, the script still runs fine since I posted it (over 2 years ago). It works for me.

---

<div class="post-metadata">

**Author:** ![Joost\_Else](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/joost_else/32/17360_2.png) [@Joost\_Else](https://community.homey.app/u/Joost_Else)\
**Post date:** [January 10, 2026, 8:59am UTC](https://community.homey.app/t/detection-of-sudden-increase-in-rh/69693/25 "2026-01-10T08:59:42Z")

</div>

> [@dsdevries](#):
>
> Any higher than that and you risk the chance of mould and it is generally not good for your health. With a constant humidity of over 75% at 18c, that bathroom is a health hazard for sure!

There used to be light moulding on the ceiling of my bathroom, but no more. The RH settles down to somewhere between 75 - 80% at 17 degrees. It’s absolutely fine.

The rest of the house is another thing. You should indeed not have too much humidity in the room where you stay for longer, but in the bathroom one typically stays for maybe half an hour tops. Usually shorter. As long as no mould is forming (ceiling, sealants, paint), that is perfectly fine.

[Previous page](https://community.homey.app/t/detection-of-sudden-increase-in-rh/69693.md?page=1)