I've been running HA for a while, and it's been working well; I haven't had to change much in a few months. That being said, it's fun to tinker with it, and I'm curious to hear what kind of automations the rest of the community is using. What automations are you most proud of? What are your favorite? What kind of interesting automations have you written?
My personal favorite is an automation that displays the current "apparent" temperature on a Hue bulb. It takes an average of the temperature, humidity, and luminance around my property and uses the average to compute an "apparent" (feels like) temperature. Then it applies a cosine function to the apparent temperature (to approximate how people feel temperature change), uses the resulting value to calculate a level between blue and red in CIELAB (a perceptually uniform color space), converts the results to RGB, and sets the color value of the hue bulb. The result is a bulb that changes color so that the change in color (as perceived by the eye) mirrors how the temperature "feels" outside. Ultimately what that means is that we can look at a small lamp with the hue bulb and say "It feels cold outside; we should put on a coat." It's probably overkill, but it was a fun programming exercise. We've started saying things like "It's really blue today, I don't feel like going out."
I'd really enjoy reading what kind of interesting automations everyone else has written.
If the furnace starts pulling more than 4,000 Watts, I get a telegram message that the auxiliary heat is running instead of the heat pump.
I have a sensor in my kindergartner's bag that lets me know when he gets to school and when he leaves school, also via telegram message.
If someone loiters around my driveway for more than 30 seconds, I get a telegram message with an image.
I haven't said it back up since I moved but I used to have one that used a combo sensor my washer and dryer doors. If the sensor moved enough for long enough it set a flag that the unit was running. If it want from running to not running for a long enough period of time, and the contact sensor wasn't tripped, I would receive alerts every 30 minutes or so that the clothes were done and still in the washer/dryer.
Even something as simple as water sensors under the sink if saved my ass. Cabinetry these days is made out of fiberboard and if it stays wet for more than a couple of hours it does horrible things.