I live with a couple roommates in an apartment. For convenience we create a simple webpage where we could quickly see who's home. It works by querying the router (running OpenWrt) every few minutes for known phones connected to the Wi-Fi. We pretty soon realized that we could actually see which room someone was in pretty consistently based on the signal strength alone.
After that it didn't take long before we exploited it as much as we could, everything from automatically turning on the coffeemaker the first time someone left their room between 7-10am to blasting an alarm if someone left/didn't leave their room at certain times.
I live with a couple roommates in an apartment. For convenience we create a simple webpage where we could quickly see who's home. It works by querying the router (running OpenWrt) every few minutes for known phones connected to the Wi-Fi. We pretty soon realized that we could actually see which room someone was in pretty consistently based on the signal strength alone.
After that it didn't take long before we exploited it as much as we could, everything from automatically turning on the coffeemaker the first time someone left their room between 7-10am to blasting an alarm if someone left/didn't leave their room at certain times.