The I.E.Q.A. system consists of spatially distributed autonomous base stations equipped with sensors, LCD display, actuator, data storage device and a board that supports a Linux distribution with built-in WiFi support. Every single base station is able to send their acquired/stored data over WiFi in a Wireless Local Area Network (WLAN) to a virtual Linux server which is aimed to process and display data through a dedicated web application. The latter, processes the data using a mathematical model based on the combination of two parameters: Heat Index (HI), which is obtained by multiple regression analysis by considering the values of temperature and relative humidity, and the Luminosity-Brightness Index (LBI) that provides an index based on the detected brightness according to UNI EN 12464 (released by the Italian National Unification).

• Dashboard: shows in real time the relevant data using charts and tables to illustrate the most important informations;
• Graphs: shows in real time detailed graphs in order to analyze data;
• Statistics: shows in real time statistics, boxplots and graphs to make statistical analysis of data;
• Report: uses the processed data to print statistical report;
• Options: allows to edit/apply various option (see functionalities for the user).

• Empty the table: allows to truncate through a SQL query of the database table which contains the all acquired values;
• Set the sampling rate: allows to set the time interval between two consecutive acquisitions on the desired base station/s;
• Set the alarm thresholds: allows to set the alarm thresholds for each sensor (e.g., temperature, relative humidity, and brightness/luminosity) on the desired base station/s.

• Connection: each BS is able to automatically connect to the WLAN network with a static IP;
• Time synchronization: the device can synchronize its clock time with the server;
• Storage device: in offline mode the acquired data are stored into a microSD card. Then, as soon as the connection has been re-established, the saved data will be automatically sent to the server;
• Programmable: it is possible to edit the firmware code setting different alarm thresholds and sampling rate directly from the server;
• Actuator: each BS has been predisposed to easily drive an actuator;
• Self-diagnostic: the device can easily identify when a fault has occurred.
• LCD and Reset: each BS has endowed with a reset button and a display with backlight that shows all informations about the system.

In the following table it can be seen the network configuration of the whole system.