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The Art of Directly Interfacing Sensors to Microcontrollers

Castelldefels School of Technology, Universitat Politècnica de Catalunya, C/Esteve Terradas, 7, Castelldefels 08860, Barcelona, Spain
J. Low Power Electron. Appl. 2012, 2(4), 265-281; https://doi.org/10.3390/jlpea2040265
Received: 24 September 2012 / Revised: 17 October 2012 / Accepted: 19 November 2012 / Published: 29 November 2012
(This article belongs to the Special Issue Energy Efficient Sensors and Applications)
This paper reviews the direct connection of sensors to microcontrollers without using any analogue circuit (such as an amplifier or analogue-to-digital converter) in the signal path, thus resulting in a low-cost, lower-power sensor electronic interface. It first discusses the operating principle and explains how resistive and capacitive sensors with different topologies (i.e., single, differential and bridge type) can be directly connected to a microcontroller to build the so-called direct interface circuit. It then shows some applications of the proposed circuits using commercial devices and discusses their performance. Finally, it deals with the power consumption and proposes some design guidelines to reduce the current consumption of such circuits in active mode. View Full-Text
Keywords: capacitive sensor; microcontroller; power consumption; resistive sensor; sensor electronic interface capacitive sensor; microcontroller; power consumption; resistive sensor; sensor electronic interface
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Reverter, F. The Art of Directly Interfacing Sensors to Microcontrollers. J. Low Power Electron. Appl. 2012, 2, 265-281.

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