There are many applications where it can be useful to know if a room is occupied or empty. For example, you may want to shut off the A/C, heat, or lights if the room isn't occupied to save on utility bills. Or, you may want to receive notifications if a room is occupied during off-hours or weekends.

This project provides a cellular and LoRa-based system for reporting door open and close events, as well as detecting motion in a room. A Sparrow Reference Node with its included PIR and a connected reed switch is positioned on or near a door frame. An open/close event or motion triggers a Note to the Notecard that is synced to Notehub with the door's new state. Multiple Sparrow nodes can be deployed around a facility and report changes to a single Notecard-powered gateway.