shows the development system implemented in
an office with the goal of testing it in real conditions while
Figure 1 shows the floor plan and where the sensor nodes
were placed. In this implementation, 25 wireless devices were
directly connected to the power supply of LED panels, so is
possible to cover the whole office presented in Figure 1. The
Zigbee network has been deployed in an office together with
2 Wi-Fi internet access points and several users’ phones and
PC connected to the access points. Under these conditions the
system was working for 6 months without any interruption
showing a high robustness to Wi-Fi interferences.