The flooding time synchronization protocol
SenSys '04 Proceedings of the 2nd international conference on Embedded networked sensor systems
Versatile low power media access for wireless sensor networks
SenSys '04 Proceedings of the 2nd international conference on Embedded networked sensor systems
Heliomote: enabling long-lived sensor networks through solar energy harvesting
Proceedings of the 3rd international conference on Embedded networked sensor systems
X-MAC: a short preamble MAC protocol for duty-cycled wireless sensor networks
Proceedings of the 4th international conference on Embedded networked sensor systems
Long-duration solar-powered wireless sensor networks
Proceedings of the 4th workshop on Embedded networked sensors
Leakage-aware energy synchronization for wireless sensor networks
Proceedings of the 7th international conference on Mobile systems, applications, and services
Proceedings of the 7th ACM Conference on Embedded Networked Sensor Systems
RACNet: a high-fidelity data center sensing network
Proceedings of the 7th ACM Conference on Embedded Networked Sensor Systems
Proceedings of the 8th ACM Conference on Embedded Networked Sensor Systems
Occupancy-driven energy management for smart building automation
Proceedings of the 2nd ACM Workshop on Embedded Sensing Systems for Energy-Efficiency in Building
Exploiting FM radio data system for adaptive clock calibration in sensor networks
MobiSys '11 Proceedings of the 9th international conference on Mobile systems, applications, and services
Proceedings of the 9th ACM Conference on Embedded Networked Sensor Systems
DoubleDip: leveraging thermoelectric harvesting for low power monitoring of sporadic water use
Proceedings of the 10th ACM Conference on Embedded Network Sensor Systems
FAVOR: frequency allocation for versatile occupancy of spectrum in wireless sensor networks
Proceedings of the fourteenth ACM international symposium on Mobile ad hoc networking and computing
Proceedings of the 11th ACM Conference on Embedded Networked Sensor Systems
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Whereas a lot of efforts have been put on energy conservation in wireless sensor networks, the limited lifetime of these systems still hampers their practical deployments. This situation is further exacerbated indoors, as conventional energy harvesting (e.g., solar) ceases to work. To enable long-lived indoor sensing, we report in this paper a self-sustaining sensing system that draws energy from indoor environments, adapts its duty-cycle to the harvested energy, and pays back the environment by enhancing the awareness of the indoor microclimate through an "energy-free" sensing. First of all, given the pervasive operation of heating, ventilation and air conditioning (HVAC) systems indoors, our system harvests energy from airflow introduced by the HVAC systems to power each sensor node. Secondly, as the harvested power is tiny (only of hundreds of μW), an extremely low but synchronous duty-cycle has to be applied whereas the system gets no energy surplus to support existing synchronization schemes. So we design two complementary synchronization schemes that cost virtually no energy. Finally, we exploit the feature of our harvester to sense the airflow speed (which can be used to infer the indoor microclimate) in an energy-free manner. To our knowledge, this is the first indoor wireless sensing system that encapsulates energy harvesting, network operating, and sensing all together.