My situation is as follow:
I own multiple apartments in one block, witch are rented out. Those apartments share 1 main boiler for all the radiators, those radiators have their own valve so the temperature can be set by the renters themselves.
Some renters forget to turn off their radiator when they leave the house. In addition some have their temperature set to high all the time.
I would like to automate this, so the radiator valve turns off when the house is empty. I just can’t figure out a fool-proof system for presence detection.
Wifi is not an option, bluetooth maybe, keypad can be forgotten and motion sensors aren’t doable (amount of sensors needed)
In addition, is there a way to measure “radiator usage” ? Maybe through temperature sensors?
Hope anyone has a genius idea for my problem…
p.s.: The main door (to enter the block) is opened by a rfid tag, so the renters are used to carry this tag on their key chain.