A self-powered finger-worn wireless tracking interface for human-machine interaction.

A self-powered, finger-worn wireless interface achieves sub-millimeter (<0.9 mm) touch trajectory localization by converting multidirectional fingertip motion into wireless signals.

• Why it matters: Conventional touch tracking is limited by rigid power supplies and tethered data links, restricting immersive human-machine interaction.
• What they did: The system uses a 3.7 cm2 corona-discharge triboelectric nanogenerator plus a flexible electromagnetic transmitter, decoded with three non-collinear receivers and a machine-learning-assisted algorithm.
• The result: It reconstructs handwritten inputs with high fidelity, enabling robust human-machine control without tethering.