I happened to inherit a skywriter from Finnian Anderson, and didn’t know what to do with it. I decided to hook it up to an Arduino Leonardo to create a gesture/shortcut pad for my computer.
The skywriter can detect a number of gestures including flicks, circles and taps. I assigned each gesture to a keyboard command, which gets “typed” by the Arduino Leonardo, using its HID capabilities courtesy of its ATmega32u4 (it masquerades as a keyboard).
After grabbing a copy of the library from here, I gave the skywriter a test and wrote a simple program to trigger different keyboard shortcuts on different gestures.
For incrementally adjusting redshift, I wrote a simple and hacky bash script, and assigned keyboard shortcuts to call it with + and – arguments.
You can find all the code on my github.
You can buy skywriters from here.
Ben James 
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