I’m looking for a way to control a 12v fan through smartthings. It’s a 3-wire PC fan, but I’m using it to cool an enclosure. I’d like to be able to adjust the voltage to change the fan speed, but I can live with on/off only if I have to.
I know the MIMOlite can do on/off, but I’m curious if anyone knows how loud the relay is when it changes state.
Is there a device that can take a 12v input and then vary the output between 0v-12v and is either z-wave or zigbee? I’ve had no luck searching for one.
Thanks for that idea. The fan is only 1.44 watts at 12v.
I noticed that the Fibaro RGBW controller is using PWM outputs. Perhaps if I got a fan that has a PWM input I could use that? Their manual says it works with fans, but doesn’t give any further detail and I can’t find anything online where anyone has actually used it for a fan control. I also read a lot about how the PWM frequency can cause fan humming, and I certainly don’t want any extra noise out of this.
Following up. I already had a regular 12V fan. I ordered the exact same fan that also had a PWM input. I asked on the Fibaro forums if anyone had any insight and was told that a regular (non-PWM) fan would work on the RGBW controller, just put the black wire on a PWM output. So I tried.
The regular fan connected to the Fibaro RGBW controller just stuttered and hummed and didn’t actually spin.
The fan with the PWM input spun fine and it changed speeds, but anything other than full speed had a bad hum on it. Also, it was not possible to completely stop the fan.
The result is that the RGBW controller does technically work with a PWM fan as their manual states, but it’s not good.
I’m going to keep the PWM fan just in case something else comes up in the future, but for now I’m just going to use a relay.
Not really. I’ve only ever found on/off options. The only thought I’ve had is something like a 12v to 5v or 9v step down to add to the relay, but that doesn’t really work because the converter is not variable either. Right now I just let my fan run full speed when it needs to.