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. 2021 May 8;11(5):147. doi: 10.3390/bios11050147

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© 2021 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Experimental control of the self-powered biosensor. (a) Simulated experimental control of testing environment. (b) Output piezoelectric voltage at different motion frequencies. (c) Output piezoelectric voltage response at different frequencies. (d) Output piezoelectric voltage at the same frequency and different angles. (e) Details of output piezoelectric voltage of angle variation. (f) Output piezoelectric voltage response of angle variation. (g) Output piezoelectric voltage at different humidity levels. (h) Biosensor durability.