We have two cats who like to hide in our house. It would be great to know where they are in the house. At first I thought about setting up an indoor localization system (iBeacon, etc.) in place, but those seem expensive.
So now I'm thinking that it would be good enough to know which part of the house they're in. There's a short hallway in our house that connects the two parts of the house together.
I'm thinking about setting up two sensors, one on each side of the hallway, and put a tag (Bluetooth?) on the cats' collars. The sensor would send a message to the central system whenever the tag gets near it within, say, 50 cm. Would be great if the tag is passive.
Any idea on where I should start? Thanks!
PS. Some suggested photointerruptors which might be cheaper, but I wouldn't know which cat it is, and I have to set one higher up to take care of people walking by as well.
