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Smart building applications require a large-scale deployment of sensorsdistributed across the environment. Recent innovations in smart environmentsare driven by wireless networked sensors as they are easy to deploy. However,replacing these batteries at scale is a non-trivial, labor-intensive task.Energy harvesting has emerged as a potential solution to avoid batteryreplacement but requires compromises such as application specific design,simplified communication protocol or reduced quality of service. We explore thedesign space of battery-free sensor nodes using commercial off the shelfcomponents, and present Pible: a Perpetual Indoor BLE sensor node thatleverages ambient light and can support numerous smart building applications.We analyze node-lifetime, quality of service and light availability trade-offsand present a predictive algorithm that adapts to changing lighting conditionsto maximize node lifetime and application quality of service. Using a 20 node,15-day deployment in a real building under varying lighting conditions, we showfeasible applications that can be implemented using Pible and the boundaryconditions under which they can fail.

Pible: Battery-Free Mote for Perpetual Indoor BLE Applications