I would like to control the brightness of some LED’s which have a voltage range of 9-12v DC. Is there anything (DIY or off the shelf) which can adjust voltage over wifi?
Thanks, Andy
I have some of these in the rgb version controlling led strip, I also have some of the single colour versions to try out but haven’t got around to it yet. They were easily integrated into home assistant though!
Thanks for the suiggestion, but these are to control some LED lights which i’ve fitted into the stairs. Not something I want to swap out really.
I believe he means that you can use the controller for your LEDs.
You can just buy a cheap version with an IR remote to try first but I’m quite sure it will work.
If it’s 12 volt controller and you need 12 volt 
Not sure about the dimmig in these controllers but I assume it’s PWM and that should work too.
Yea sorry, I realize that link went straight to the item and showed led strip. In the options there is a wifi controller that has a dc input/output connector. So will fit inline with most 12v lighting, although you may need an adapter.
I’m pretty sure it’s pwm dimmed too.
Hope that helps.
Interesting! I might have to give that a go. Thanks!
EDIT, see now this was not OP.
Sorry. never mind about most of this post.
I didn’t even click on the link.
I just looked at the image. That is how I roll 
Will it fit? Don’t know. We only know you have 9-12 volt LEDs, how should we know if it fits?
Those LED strips have four wires coming out.
Black 12 volt
Green ground
Blue ground
Red ground
All you need to do is to connect the 12 volt and one of the grounds.
Then you should be able to dim the lights.
But if you have a spare LED, try it with that first. Or disconnect the “chain” and just hook up one or two to the controller to see what happens.
There is no need to try on all of them and have them all break.
If you only have one color LEDs then you can probably get a cheaper version with only two wires. 12 volt and ground.
Unsure if you have separate lights or strips (white or RGB?), and if you’re just looking for a HA-controllable controller for these?
If so, I’ve been using several of the el-cheapo H-801 (chinese) controllers for 5050 LED light strips (1…5 channels, for RGB, cold white, warm white), theoretically up to 4A per channel (I wouldn’t). These work with 5–24VDC can be gotten for around 8–12€.
And if you don’t like these chinese cloud-based apps, you can easily flash ESPurna on them and use them with HA.
Thank you for all your suggestions. I should have been more specific about the lights originally I know!
They are warm white mini led spots which I have mounted in my stairs.
I managed to cobble together something quick with a few bits I had spare.
Used a nodemcu with ESPHome and the pmw output and now they are working just as I wanted!