Dryad
Designed to detect smoke in the smoldering stage, Dryad sensors are built in the form of a hanging tag and mount directly to the trunk of a tree. They detect hydrogen, carbon monoxide, and other gases. In addition, they measure temperature, humidity and barometric pressure. They are powered by an integrated solar panel with supercapacitor storage. Multiple units communicate to a gateway using LoRaWAN for low bandwidth long-range communications. Multiple local gateways connect over a mesh network and to Internet through a gateway.