An intelligent bathroom

Monitoring system for detection of person and his/her activity in the bathroom is described in the paper. It also detects and monitors person taking bath. The system consists of sensors measuring humidity, air and water temperature, spilled water, and state of bathtub. The bathtub state detector (BSD) allows controlling water level and its temperature. It also monitors of person´s activity when being in bathtub. It is an essential part of the system. The BSD distinguishes between four cases: 1. the bathtub filled only with water, 2. the bathtub filled with water and occupied by person, 3. the bathtub filled with water and occupied by active (moving) person, and 4. empty bathtub. Presence and activity of the person is recognized by means of multifrequency impedance measurements.