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. 2019 Feb 1;19(3):627. doi: 10.3390/s19030627

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© 2019 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 (http://creativecommons.org/licenses/by/4.0/).

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openZmeter (oZm) hardware block diagram. Block for signal acquisition coloured in green, power supply and management elements coloured in orange, STM32 microcontroller in black, and advanced RISC machine (ARM) Linux board controller in yellow.