Cool "Donot Disturb" implementaion

I found this in Reddit -

Does anyone know how to code this??

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Think you can buy rgb led strips w/ controller.

Post removed by the PC Police?

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Looks like yes, but it was a LED strip around the door which would change color based on the calendar. It was like signal to OP’s kids.
Red - Busy, do not disturb
Yellow - Knock the Door
Green - You can come in