Show HN: Simple Tool That Helps You Keep a Healthy Rhythm While Breathing

Some time ago I stumbled upon this article about using a smart bulb to keep a healthy breathing rhythm: https://asim.ihsan.io/healthy-breathing-with-a-smart-bulb/

But I needed something simpler that I could throw on a second screen while working. So I built myself Breather! Maybe it will help some of you as well. :)