# Automations based on rate of humidity increase **URL:** \ **Category:** Automation Ideas\ **Created:** [October 23, 2022, 2:01pm UTC](https://community.smartthings.com/t/automations-based-on-rate-of-humidity-increase/250425 "2022-10-23T14:01:11Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![maranhao](https://avatars.discourse-cdn.com/v4/letter/m/7ba0ec/32.png) [@maranhao](https://community.smartthings.com/u/maranhao)\ **Post date:** [October 23, 2022, 2:01pm UTC](https://community.smartthings.com/t/automations-based-on-rate-of-humidity-increase/250425/1 "2022-10-23T14:01:11Z")
I have had a humidity sensor near my shower for quite a while, but never got it to trigger my bathroom fan nicely. The problem is that the baseline humidity changes day to day and throughout the year, so establishing a rule based on a fixed humidity never worked well. What I’d like is a rule that triggers if the humidity has increase by x% in a span of y minutes or less, and then I would like it to run until the humidity reach (x-1)% less than the present humidity. Does anyone know how to make this happen? Thanks, B ---
**Author:** ![David\_Pritchard](https://yyz2.discourse-cdn.com/smartthings/user_avatar/community.smartthings.com/david_pritchard/32/95806_2.png) [@David\_Pritchard](https://community.smartthings.com/u/David_Pritchard)\ **Post date:** [April 6, 2023, 11:57pm UTC](https://community.smartthings.com/t/automations-based-on-rate-of-humidity-increase/250425/2 "2023-04-06T23:57:35Z")
Did you ever figure this out? I am considering moving to Hubitat as automation like this was easy with Groovy but impossible with Edge… ---
**Author:** ![Johnnybegoode](https://yyz2.discourse-cdn.com/smartthings/user_avatar/community.smartthings.com/johnnybegoode/32/172925_2.png) [@Johnnybegoode](https://community.smartthings.com/u/Johnnybegoode)\ **Post date:** [April 8, 2023, 6:42pm UTC](https://community.smartthings.com/t/automations-based-on-rate-of-humidity-increase/250425/3 "2023-04-08T18:42:25Z")
A possible solution is to use the Smartthings rule function Changes to read the increase in humidity, and then trigger a virtual switch. Set the humidity reportable value [2 o 3?] in the driver settings for the sensor - recommend the Zigbee Temp and Humidity Mc driver - and then use @TAustin’s timer Utility driver to control how it rises, sending a notification when e.g. 3 increases ocour in 10 minutes. Needs a bit of trial and error to calibrate but it can be done. ---
**Author:** ![maranhao](https://avatars.discourse-cdn.com/v4/letter/m/7ba0ec/32.png) [@maranhao](https://community.smartthings.com/u/maranhao)\ **Post date:** [April 9, 2023, 12:35pm UTC](https://community.smartthings.com/t/automations-based-on-rate-of-humidity-increase/250425/4 "2023-04-09T12:35:09Z")
David, I did this utilizing TAustin’s MQTT Device Creator. I created a dummy humidistat and a dummy switch. I then created a SmartThings Rule that copies the humidity from the actually humidity sensor to the dummy one. It also requires a RPi that listens for the humidity to be reported on MQTT by the dummy humidistat. The logic for when to turn on/off the fan runs on the RPi and controls the dummy switch. A rule in the SmartThings app then turns the fan on and off based on the dummy switch status. Check out the discussion here: [Edge and Local Control via API or App - #11 by maranhao](https://community.smartthings.com/t/edge-and-local-control-via-api-or-app/237194/11) ---
**Author:** ![Johnnybegoode](https://yyz2.discourse-cdn.com/smartthings/user_avatar/community.smartthings.com/johnnybegoode/32/172925_2.png) [@Johnnybegoode](https://community.smartthings.com/u/Johnnybegoode)\ **Post date:** [April 9, 2023, 2:40pm UTC](https://community.smartthings.com/t/automations-based-on-rate-of-humidity-increase/250425/5 "2023-04-09T14:40:40Z")
Great, I’m not into MQTT so wouldn’t have thought of that! Managed to do something similar to what I suggested to get a storm warning using a rapid drop in atmospheric pressure, which comes on the Aqara sensor. Still not perfect yet but I’ll get there. Will take a look at your link. ---
**Author:** ![David\_Pritchard](https://yyz2.discourse-cdn.com/smartthings/user_avatar/community.smartthings.com/david_pritchard/32/95806_2.png) [@David\_Pritchard](https://community.smartthings.com/u/David_Pritchard)\ **Post date:** [April 10, 2023, 1:57am UTC](https://community.smartthings.com/t/automations-based-on-rate-of-humidity-increase/250425/6 "2023-04-10T01:57:22Z")
Thanks for the detailed reply dude. So much hassle for what should be a simple scenario to automate. Might be time for me to switch platforms to Hubitat. It really seems like ST has gone backwards and webcore runs locally on Hubitat.