Sozu: Self-Powered Radio Tags for Building-Scale Activity Sensing
summary
Sozu converts energy harvested from activities into RF broadcasts so objects become self-powered radio tags that cost < $1 per tag and avoid batteries, operate in 35–85 MHz with 0.5 MHz bandwidth, require 0.12 mJ per transmission and 2.05 mW continuous, and use simple analog circuits plus off‑the‑shelf harvesters. A 30‑object deployment shows >99% true positive with near‑zero false positives, can report state/intensity/count, and achieves 4.1 m localization across floors.
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