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. 2018 Jan 19;4(1):eaao2623. doi: 10.1126/sciadv.aao2623

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Copyright © 2018 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 NonCommercial License 4.0 (CC BY-NC).

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Fig. 4 — (A) The characters “+,” “9,” “4,” and “1” are encoded in angular segments around 270°, 180°, 90°, and 0°, respectively. (B) Photograph showing a 2D sensor mounted on an elastic wristband resembling a virtual keypad. The encoded symbols are displayed when a corresponding angular segment of a sensor is exposed to a magnetic field of a small permanent magnet at the fingertip (movie S3).