Automating En-Suite

[Jonpho]

Just want bit of advice before i purchase items to automate the ensuite.

At the moment i have light switch which switches on lights and an extractor fan. When lights switch off the extractor fan stays on for approx 2 minutes.

I have access to all wiring in the loft space.

What I want to do is put a fibaro dimmer onto the lights, and then a relay onto the extractor fan. I’m looking at an aeon multisensor for the ensuite.

So when motion is detected only the lights will come on. I want dimmer on this so, at night, lights will only come on low.

If someone has a shower and humidity increases I then want fan to come on until humidity drops below a certain level.

Does that sound feasible and is there anything I may be overlooking??

[JDRoberts]

It depends on the exact wiring, but it sounds doable.

As far as the code goes, there are a number of different community-created smartapps that manage bathroom fans. It’s a popular use case.

Here is a simple one that only checks against humidity:

[RELEASE] Smart Bathroom Fan

Smart Bathroom Fan Bathroom fan automation can be tricky. If your house is anything like mine, it's not exactly air tight. Seasonal changes in humidity can make it difficult to set specific relative humidity percentages at which to turn your bathroom exhaust fan on or off. This SmartApp attempts to put some intelligence into the process by sampling the humidity in the room every five minutes and maintaining a rolling 24-hour average humidity. Your thresholds are then specified based on this average. Features This SmartApp does the following: Turns on the fan when the humidity is more than X percent greater than the 24-hour average. Turns off the fan when the humidity falls to within Y percent of the 24-hour average OR after an optional (but recommended) specified maximum am…

And this one is more complicated and also looks at motion. The thread has a detailed discussion of how the humidity readings work on the smartthings sensor, which might be helpful.

Bathroom Light Control

Bathroom Light Control Initial Release: 1.0.1 Controls bathroom lights: - Turn on light when motion is detected. - Turn off light after x minutes of no motion detection - Extend light off timer to x minutes if humidity sensor is above the average for the room and trending upward (shower in use?) Developed / Tested with Aeon Multisensor which by default sends humidity every 8 minutes. We need to detect that humidity is rising with 1 reading as most people will want this to kick in by the 8 minute period and not 2 polls which would be 16 minutes. To do so we calculate the average temp over a period of readings (4 by default), then if the humidity is higher than the average and higher than the last reading, it is determined that humidity level is trending upward, so we adjust the off …

And for anyone who hasn’t worked with custom code in smartthings before, here’s the FAQ on that.

FAQ: An Overview of Using Custom Code in SmartThings

So you're new to SmartThings, you asked a question, and someone suggested "custom code" as an answer. Or you were browsing the forums, and you found something that sounded like it would be perfect for what you wanted, but again, "uses custom code." What does that mean, how hard is it to do, and what's the difference between a "SmartApp" and a "Device Type Handler"? (Note: the official terminology has changed a couple of times. "device type handler," "device handler," "DTH," and "device type" all mean the same thing, and you will find all these terms used in the forums.) SECTION I: SMARTAPPS AND DEVICE HANDLERS: WHAT THEY ARE SmartAPPS: Tiny Programs to decide what a specific device should do when, or to collect the information from a specific device SmartApps, including the var…