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. 2021 Jul 22;7:55. doi: 10.1038/s41378-021-00274-x

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 1 — a Illustration of the placement of sensors on the human body for lung and heart sound monitoring. b Image of the prototype of the sound sensor. c Inside view of the prototype with a printed circuit board. d Structure of the accelerometer-based on an asymmetric gapped cantilever structure. H is the distance between the layer of the piezoelectric beam and the neutral plane. e Built-in charge amplifier circuit for amplification of the piezoelectric signal