MARS: Nano-Power Battery-free Wireless Interface for Touch, Swipe and Speech Input
summary
A battery-free wireless sticker that senses touch, swipe and speech by modulating an ultra-low-power LC oscillator and backscattering a carrier, built from just nine components and a zero‑threshold FET. Startup is ~380–500 mV and ~1.5–2 μA, allowing power from 1–2 photodiodes or a finger on a thermoelectric generator. Range measures ~9 m for audio tags and ~12 m for single‑frequency tags; a 1 MHz band supports about 30 single‑frequency and 8 audio stickers simultaneously.
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