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Open AccessArticle

A Nontoxic Battery with 3D-Printed Housing for On-Demand Operation of Microcontrollers in Microfluidic Sensors

1
Laboratory of Process Technology (NeptunLab), Department of Microstructure Engineering (IMTEK), University of Freiburg, Georges-Köhler-Allee 103, 79110 Freiburg, Germany
2
Freiburger Materialforschungszentrum (FMF), Stefan-Meier-Straße 21, 79104 Freiburg im Breisgau, Germany
*
Author to whom correspondence should be addressed.
Micromachines 2019, 10(9), 588; https://doi.org/10.3390/mi10090588
Received: 1 August 2019 / Revised: 29 August 2019 / Accepted: 2 September 2019 / Published: 4 September 2019
(This article belongs to the Special Issue 3D Printed Microfluidic Devices and Its Applications)
Microcontrollers have a low energy consumption and are convenient tools for the operation and readout of small lab-on-a-chip devices. The operation of microcontrollers for data collection and analysis is key for measurements and statistics in field experiments. However, for portable lab-on-a-chip or point-of-care systems in low-resource settings, the availability of energy sources is a bottleneck. Here, we present a simple, nontoxic aluminum/air redox battery with a 3D-printed housing for on-demand operation of a sensor using a microcontroller for data collection. The battery is stored in a dry state and can be manufactured conveniently using off-the-shelf components and a simple 3D printer. It can be quickly assembled and operates a microcontroller for at least one hour in continuous operation mode. We demonstrate its performance by collecting data from a capacitive sensor capable of determining the conductivity of liquid samples. Such sensors can be used for, e.g., determining the water quality or phase formation in liquid mixtures. The sensor performance in determining different conductivities of nonconductive and conductive liquids in droplets is demonstrated. View Full-Text
Keywords: 3D printing; battery; microcontroller; microfluidics; capacitive sensor 3D printing; battery; microcontroller; microfluidics; capacitive sensor
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MDPI and ACS Style

Sachsenheimer, K.; Richter, C.; Helmer, D.; Kotz, F.; Rapp, B.E. A Nontoxic Battery with 3D-Printed Housing for On-Demand Operation of Microcontrollers in Microfluidic Sensors. Micromachines 2019, 10, 588.

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