After seeing this thread, I implemented an automation using HomeAssistant to do this. In my implementation, when the car goes into park from either drive or reverse, if my Android phone is using a wireless charger and the car is away from home, the car will honk the horn, then flash the headlights. Pretty trivial to implement.I want to add to the request to create some sort of sound/alert that would tell the driver as they are existing that their phone is on the charger/in the car
I first tried triggering on the doors open state, but there is enough delay in getting the car's state, that it is possible to open the door, exit, and close the door without HomeAssistant seeing the open state. The park state seems to work OK. My only concern is if there is too much delay, I could be inside a building when the car honks.
I thought about having the car automatically lock if this automation runs, but, if I left my wallet, with keycard at home, I could find myself in a pickle!
Unfortunately, as far as I can tell, IOS does not report a charger type, so it's not possible to know that an iPhone is using a wireless charger. I can see if an iPhone is charging, but am unsure what is reported if the phone was fully charged sitting on a wireless charger. Maybe it still reports charging? Android has a much richer HomeAssistant interface than IOS.