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. 2018 Feb 9;18(2):530. doi: 10.3390/s18020530

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© 2018 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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Current draw from a 4.6 V supply by different SD cards accessed in SPI mode: (a) Current drawn during a power optimized save to a no-name 1 GB microSD card that is compatible with 512 byte data saves. (b) Current draw on that same logger running the same code using a SanDisk 2 GB microSD card that is not compatible with small blocks sent over the SPI interface. Though the data was recorded without error, the event required 10.33 mAs which is ~4 times the power consumption of the 1 GB card. These records were captured with an Arduino UNO measuring the voltage drop across a 12 Ω shunt resistor at ~89 kHz (ADC prescalar = 8) [37].