Hi Ben,
We have a unique problem, My wife runs a ECD playschool centre, she has assistant teachers and around 20 children. With the various classes they each have to be at certain areas at certain times. Children love to wonder off.
Would it be possible to build a sensor/s with a raspberry or alternative that could be placed in each classroom that could sense how many people where in a room at any time, then output to an e map of the building to a screen. This would help you to always know where the different classes where at any giving time, also making sure that all students are out the class when need be, this could also be vital for catching the little rascals that decide to hide.
This could also have practical safety sense in an emergency.
Thanks, looking forward to your feedback.