Filip Forsby, Daniel Lindfors, Martin Persson, Emmy Ryrstedt and Alexander Östman from KTH has finished their work on energy visualisation for open offices. They focused on developing a cheap and energy efficient sensor that can track how many that are currently occupying and area or room. This information can be used to put the energy use in a context or provide the usage per person. It can also be used to control lighting and utility system to save energy.

Picture of the signal from a PIR sensor without the fresnel lens when a person first is passing in through a door and then passing out seconds later.

The demo plattform.

Picture on the left the aluminium shading on the pir sensor to improve the signal. Picture om the left and schematic image of the pir sensor and its two sensor elements.

The report (in Swedish) can be found here: