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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
Received: 24 September 2012; in revised form: 17 October 2012 / Accepted: 19 November 2012 / Published: 29 November 2012
Abstract: 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.
Keywords: capacitive sensor; microcontroller; power consumption; resistive sensor; sensor electronic interface
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MDPI and ACS Style
Reverter, F. The Art of Directly Interfacing Sensors to Microcontrollers. J. Low Power Electron. Appl. 2012, 2, 265-281.
Reverter F. The Art of Directly Interfacing Sensors to Microcontrollers. Journal of Low Power Electronics and Applications. 2012; 2(4):265-281.
Reverter, Ferran. 2012. "The Art of Directly Interfacing Sensors to Microcontrollers." J. Low Power Electron. Appl. 2, no. 4: 265-281.