- The layout is such that the bathroom door need not be closed so although I could install a door sensor, an open door doesn't necessarily mean that the lights shouldn't be on.
- Can't presume user will have an iPhone or fob of any sort.
- I have two hue motion sensors that I can use. I thought Sensor A in the corridor entrance to the bathroom could trigger then Sensor B in the bathroom triggers so in theory this means that someone should have walked into the bathroom. The reverse sequence should trigger on OFF command as it then indicates they have walked out of the bathroom. But I'm concerned that this sequence may not be reliable eg say someone is in the bathroom, having triggered A and B, and another person enters the corridor and triggers A, then B would already be triggered (since there's someone in the bathroom) meaning that the OFF command would be triggered!
- As a failsafe I'd want to have an auto-off after a certain amount of no motion in the bathroom but what happens when someone is motionless in the bath for 30 minutes?
All thoughts welcomed!