This is a brilliant idea.
Means the phone just needs to be in range of the pebble/watch and not always on you as you move around.
Posts made by Timie
Dot and IFTTT
Really looking forward to Dot and IFTTT.
Hopefully Presence will be fairly accurate with it.
I currently have a homemade home automation system (detects presence and controls lights + tracks heating timings verses occupancy). It uses a Raspberry Pi and pings for phones.
However iphones are not great at keeping wifi on in a reliable enough way.
If the presence sensing is accurate the PI can have a camera fitted to be a burglar alarm as well, turn on motion sensing/saving to dropbox when motion is detected with no known people at home.
This is probably a bit complex for most Dot users, but opens the possibilities for makers.