AlterNail: Ambient, Batteryless, Stateful, Dynamic Displays at your Fingertips
summary
Small fingernail PCBs host a batteryless, inductively powered coil, a microcontroller (ATtiny85 level), an accelerometer and a flexible 16×26 mm e‑ink panel so the nail updates only while placed on a powered object and persists without power. Proof‑of‑concept shows object opportunistic charging from a cookie jar transmitter, habit and transit badges, and an NFC variant for phones, and uses simple vibrational sensing for vibration‑based object ID.
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