Panoramic Wifi Camera creates a live panoramic image of a space seen through Wifi radio and other 2.4 GHz radio signals – how they bounce back form the architecture, composing an image, just as light would do.
However, the ‘light sources’ in this case are laptops, wifi hoptpots, iPhones, and even microwave overs (see the video for more on this).
20 home made directional antenna are placed in a careful array, each at a slightly different angle, to evenly cover a vertical view. This array is than rotated slowly around, scanning the space and building up an image of the space column by column.
More at wificamera.propositions.org.uk