In a facility, it can be useful to know when a door has been, open, closed, or even left open when it shouldn't be. Whether it's the door of a fridge, machine, hallway, or conference room, knowing the current state of a door can help building and facilities managers optimize costs, and minimize manual detection through scheduled rounds.

This project provides a cellular and LoRa-based system that can be used to monitor and report door open and close events in multiple points throughout a facility. Each door is fitted with a Sparrow node and door switch, and state changes are reported to a single Notecard-powered gateway, which then synchronizes those changes to Notehub.