UbiquiTouch: Self Sustaining Ubiquitous Touch Interfaces
summary
A battery-free touch pad that harvests light and runs at 30.91μW, using conductive threads or printed traces to sense location and ambient FM backscatter to send binary packets to a nearby smartphone FM receiver. Tests show high accuracy indoors and outdoors with the phone in hand or pocket, 0.7s end-to-end latency (about 0.4s response if decoded on-phone), and demonstrations on clothing, posters, paper and books without extra infrastructure.
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