Making a dumb bathroom extractor fan smart - using Zigbee control

Whiffle

Whiffle

Whiffle

Associate
Joined
27 Jul 2009
Posts
386
Hi there.

My current bathroom extractor fan is very basic.

It has been wired to a pull switch, which is then been wired to the permanent live on my bathroom light.

Works pretty well - you just pull the switch to turn it on and off.

However, I was thinking of adding a bit of automation with my HomeAssistant server.

Are there any Zigbee relays, out there, that I could attach between the extractor fan and the pull switch.

I am hoping that if I use a humidity sensor in the bathroom, I can forget having to using the pull switch.
 
I don't see why one of the sonoff zigbee smart switches wouldn't be able to handle this. Has a manual override for the switch and still allows HA to include it within some specified rules such as motion detect or humidity (or both). I bought a few to use on my bathroom lights but not got around to wiring them in yet.

Basically run the power to the sonoff unit and to the fan, then a loop to the switch so you still have manual control if needed.

 
interesting idea about using a zigbee relay. I want to do much the same. Was thinking about replacing the pull cord with a PIR sensor, then replacing the wire from the PIR to light pendant with a 4 core wire. The PIR could then be used to keep the extractor on for a set period of time, through the switched live in the 4 core wire (I think).
 
Steeps said:
I don't see why one of the sonoff zigbee smart switches wouldn't be able to handle this. Has a manual override for the switch and still allows HA to include it within some specified rules such as motion detect or humidity (or both). I bought a few to use on my bathroom lights but not got around to wiring them in yet.

Basically run the power to the sonoff unit and to the fan, then a loop to the switch so you still have manual control if needed.

Click to expand...

Thanks for that, Soldato - that looks very promising.

I won't have any need for a manual switch, so I can just put this in somewhere between the extractor and the power from the manual cut-off switch (remembering to send the live in and out the right way).

My only slight issue is that I will be putting the switch in the space in a cavity wall - do you think that will be a problem?
 
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