A “Do Not Disturb” door hanger costs $7 on Amazon.
It's not about the price. It's because it's COOL - and because somebody did a fun thing with hardware and software, which is great!
Which is more expensive than an esp32 and a led panel, and less convenient.
And requires me to remember to get up and hang it before a scheduled meeting. Or not hang it when someone calls me and a meeting erupts. And I need to remember to take it down after each call. (If I don’t, then it’s just up all the time and might be taken as seriously as a Prop 65 Warning.)
Automations are really nice for certain things!