Just to name a few besides the obvious (movement+)dark=light on, and scenes for home, away, sleep and vacation:
- Damp in bathroom (=shower) sets fan high, cranks up thermostat, increases volume on bathroom smart speaker (shower is a lot of background noise). EDIT: this has now been augmented with activity from my smart shower head
- Dry air turns off fan, light off restores thermostat and speaker volume in bathroom
- Window/door open for x time lowers thermostat in that room
- No presence for long time in a room lowers thermostat in that room
- Kid leaving lowers thermostat in that kids room
- Everyone left lower all thermostats and boiler temp
- Home, away, sleep, vacation mode to influence automations, such as fake lighting as if we are home while we are actually on vacation, kill all lights when gone, turn on basic lighting etc. no notifications when asleep (also based on bed sensors)
- Warnings on smart speaker to close windows when it is raining, op open close on temperature difference inside/outside, open when air quality bad
- Block automated rollerblinds/screens when window open or rain, wind too strong
- When window closes that previously blocked the rollerblind, mimic the blindposition of adjacent window.
- Door and temperature sensors on fridge to warn if doors are open or temperature too high
- Humidifiers/dehumidifiers react on humidity levels
- Warning when things are done: car/bike chargers, washing machine, etc based on power usage
- Warnings to water the plants or irrigate when soil is dry
- Fire alarm sets all lights to maximum brightness and notifies on mobile, closes fire retarding door
- Car home and plugged in unlocks the car charger
- Low tariff kicking in or solar panel overproduction starts charging car
- Notifications when car or bike is not home while owner is home (BLE tracker on bikes)
- Leaving home while window open notifications, also lower screens in front of some.
- Turn 3d printer off when inactive and nozzle temperature is low (keeps fan on while still hot)
- Turn rpi with octoprint on/off based on if 3d printer is on/off (including safe shutdown of course).
- Turn power on for crosstrainer when the vibration sensor detects movement (the thing has absurd high standby usage).
- Turn on/off subwoofer based on amp power usage (also due to high standby use)
- light sensors to turn on/off lights, open/close curtains (while also looking at preset mode for sleep/awake)
- Doorbell or garden movement casts camera to google hub (unless door opened, because that is us)
- Smart lock on or off night lock when away/home/sleeping/awake
- Livingroom door (fire retarding near stairs) closes when there’s a fire
- Livingroom door closes or when some one left it open too long in the heating season: