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Sensors 2016, 16(11), 1786; doi:10.3390/s16111786

Development and Experimental Comparison of Low-Cost, Reliable Capacitive Touch Sensing Boards

1
Siemens AS, Corporate Technology Development Center, Kocaeli 41480, Turkey
2
Department of Electrical and Electronic Engineering, Engineering Faculty, Dokuz Eylul University, Izmir 35390, Turkey
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 29 June 2016 / Revised: 18 October 2016 / Accepted: 19 October 2016 / Published: 26 October 2016
(This article belongs to the Section Physical Sensors)

Abstract

In this study, two types of direct interface capacitive sensors, self- and mutual-capacitance, were developed and compared experimentally. Electromagnetic Compatibility (EMC) tests—International Electrotechnical Commission (IEC) 61000-4-3, IEC 61000-4-4, IEC 61000-4-6—were applied in an accredited laboratory to measure the immunity of the sensors against radiated and conducted interference. The frequency hopping algorithm could be implemented for the mutual-capacitance sensor without using any particular circuit. The effects of EMC disturbance were detected by means of a new noise detection algorithm and when the signal-to-noise ratio (SNR) became lower, the operation frequency of the sensors switched to an undisturbed frequency to ensure safe operation. For this purpose, a new noise detection algorithm was developed and frequency hopping was performed with a standard controller. Both cards were tested under several conditions and their performances compared. View Full-Text
Keywords: capacitive touch sensors; mutual and self-capacitance; charge transfer; noise detection; frequency hopping capacitive touch sensors; mutual and self-capacitance; charge transfer; noise detection; frequency hopping
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Akkoç, F.; Şahin, Ö.C. Development and Experimental Comparison of Low-Cost, Reliable Capacitive Touch Sensing Boards. Sensors 2016, 16, 1786.

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