  We design and build a system called EpiFi, which allows epidemiologists to
easily design and deploy experiments in homes. The focus of EpiFi is reducing
the barrier to entry for deploying and using an in-home sensor network. We
present a novel architecture for in-home sensor networks configured using a
single configuration file and provide: a fast and reliable method for device
discovery when installed in the home, a new mechanism for sensors to
authenticate over the air using a subject's home WiFi router, and data
reliability mechanisms to minimize loss in the network through a long-term
deployment. We work collaboratively with pediatric asthma researchers to design
three studies and deploy EpiFi in homes.
