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. 2021 Oct 13;7(42):eabj0694. doi: 10.1126/sciadv.abj0694

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Copyright © 2021 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution License 4.0 (CC BY).

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Fig. 5. — (A to D) Fingertip-shaped capacitive touch sensor. (A) Schematic illustration and photographs of the fingertip-shaped touch sensor. The sensor is composed of four touch pads (T1, T2, T3, and T4). (B) Gesture control functions. Four touch pads allow not only four simple taps but also several gesture controls such as double tap, flick, and rotation. (C) Capacitance changes over time when gesture control functions were applied. CCW, counterclockwise. (D) Quadcopter drone control using the touch sensor. The touch sensor was successful in controlling a quadcopter drone. (E and F) Hemisphere-shaped speaker. (E) Photograph of the hemisphere-shaped speaker. (F) Characteristic of the speaker. The speaker generated sound well with little sound distortion under mechanical deformations such as pressing and stretching. Photo credit: Jungrak Choi, KAIST.