# Demo Abstract: Pible: Battery-Free Mote for Perpetual Indoor BLE Applications

## TL;DR

Pible is a battery-free indoor BLE sensor node that uses ambient light energy harvesting, enabling perpetual operation and supporting smart building applications without battery replacement.

## Contribution

The paper introduces Pible, a novel battery-free BLE sensor node using off-the-shelf components and an adaptive energy management algorithm for indoor environments.

## Key findings

- Supports multi-year operation without batteries
- Balances node lifetime, QoS, and light availability
- Adaptive algorithm improves energy efficiency

## Abstract

As of today, large-scale wireless sensor networks are adopted for smart building applications as they are easy and flexible to deploy. Low-power wireless nodes can achieve multi-year lifetimes with an AA battery using Bluetooth Low Energy (BLE) and Zig-Bee. However, replacing these batteries at scale is a non-trivial, labor-intensive task. Energy harvesting has emerged as a potential solution to avoid battery replacement but requires compromises such as application specific sensor node design, simplified communication protocol or reduced quality of service. We show the design of a battery-free sensor node using commercial off the shelf components, and present Pible: a Perpetual Indoor BLE sensor node that uses an ambient light energy harvesting system and can support numerous smart building applications. We show trade-offs between node-lifetime, quality of service and light availability and present a predictive algorithm that adapts to changing lighting conditions to maximize node lifetime and application quality of service.