Task of locating particular seats in a partially (or otherwise) occupied auditorium can be difficult. The need for this may arise in a variety of situations in the emerging IoT centric world. They present in this paper the development of a system they have tagged Seat Sense. It is a means of detecting the availability or occupancy status of seats in any hall (of any conceivable capacity). Seat Sense can find applicability in various indoor situations such as: concert halls, stadiums, churches, cinema halls and even outdoors e.g. in buses where seats are not pre-assigned. A sensor node located in each seat detects if it is occupied and feeds back information to a data sink where it is interpreted and visualized.