Fig. 1. The Italian PDS and some technologies installed for monitoring the user's habits and user-environment interaction. (a) The power measurement system to control the use of the electric cooker and coffee machine; (b) and (c) Wireless switches to monitor the use of the cupboard and refrigerator, respectively; (d) The power meter to monitor the use of the television; (e) The depth cameras installed in the living room and the Wi-Fi indoor air quality monitoring station; (f) The WiFi switch to control the lights installed in all of the rooms in the apartment. Fig. 2. Block diagram of the NATIFLife architecture [23] (© 2019 IEEE). 36 IEEE Instrumentation & Measurement Magazine June 2020