Manual knob to dim the screen on a Mac...? Is there one?

[Turnpike]

I know there are apps like QuickShade, but since buying a manual knob that plugs into my iMac to control the volume (and using it constantly) I've wished there was also one for dimming the screen. I use 4+ screens and while I wait for things to download or process, it would be nice to dim them quickly and easily...

Does anyone know of a plug and play solution, or even something that can be done with some customizing...?

Or a way to repurpose the manual volume buttons I already use...?

There was once an item on Kickstarter that had manual buttons for Photoshop, but I remember looking and there wasn't anything in the bundle that would dim the screen.

Also, if nothing exists, and someone here has the ability (know-how) to build something like this, which I assume would be an app that could use an existing (or custom) knob to dim the screen, then get in touch, as I'd be willing to explore financing a run of an item that could do this.

Attatched are the 2 different manual volume controls that I use now, and 2 photos of the Pallet system that I don't even know if it was successful on Kickstarter or wherever I saw it, just so you get an idea of what I mean.

 

[Barnclos]

It’s at the opposite end of the spectrum to an analog switch, but what about Siri: ‘dim screen’ is a Siri command. I don’t use it, and don’t know if Siri can dim individual screens in a multi-screen setup (e.g. ‘dim screen 2’), but it may be worth investigating.

 

[Bodhitree]

The iMac wireless keyboard has brightness up and down buttons…

 

[BrianBaughn]

The iMac wireless keyboard has brightness up and down buttons…

As does the moderately-priced Matias wired keyboard I'm using with my Hackintosh. It doesn't work with a Hackintosh…but it's there.

 

[ignatius345]

I wonder if there's a way to run something that would let you use your mouse's scroll wheel -- like if you held down a modifier or something and turned it temporarily into a brightness control. Karabiner Elements might let you do something like this.

 

[Turnpike]

So knowing this, I even more so want what seems to be possible... a mechanical knob or slider to control the brightness...