AuraSense: Enabling Expressive Around-Smartwatch Interactions with Electric Field Sensing
summary
A smartwatch prototype uses electric-field (shunting-mode) sensing with one transmitter and four to ten receiver electrodes to enable around-device input; a custom board dynamically selects antenna configurations and runs SVM classification and regression on 12 features. Evaluations with 10 right-handed participants report six interactions supported (on-skin buttons, sliders, 2D skin tracking, in-air position, and two gesture types), 92.7% accuracy for four skin buttons, 2 mm slider error, 7.2 mm skin tracking error, 18° average angular error for in-air angles, and ~82–89% gesture accuracies using a prototype built on an LG G Watch driven by a 115 kHz square wave.
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