My quest continues. I didn't think it was all the way back in January that I last posted about this dream, but it was! Postifier is a little gizmo intended to be put inside a mailbox that will alert you when there's actually something placed inside:
The device lives on the inner roof of your postbox, attached with adhesive. It has a sensor that detects changes in infrared light when new mail arrives. When it detects mail, it activates the Bluetooth module and waits for the Postifier/smartphone reunion, at which point it will connect with your paired device and tell you the news.
So it's not quite the reporting structure I imagine, but the technology would be perfect to detect whether there's a pair of legs under a given study table, no?
Postifier doesn't actually exist yet, as it's looking for funding on Indiegogo. Waffling about whether to throw in some money just for testing. At $20-$25 each, it's still not an economical way to cover a couple hundred seats :-(