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Sensors 2017, 17(5), 1150; doi:10.3390/s17051150

Measuring Dynamic Signals with Direct Sensor-to-Microcontroller Interfaces Applied to a Magnetoresistive Sensor

1
Department of Computer and Electrical Engineering, Universidad Autónoma de Ciudad Juárez (UACJ), 32310 Ciudad Juárez, Mexico
2
e-CAT Research Group, Department of Electronic Engineering, Universitat Politècnica de Catalunya (UPC)—BarcelonaTech, C/Esteve Terradas 7, C4, 08860 Castelldefels, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Pak Kwong Chan
Received: 6 April 2017 / Revised: 9 May 2017 / Accepted: 15 May 2017 / Published: 18 May 2017
(This article belongs to the Special Issue Autonomous Sensors)
View Full-Text   |   Download PDF [3876 KB, uploaded 18 May 2017]   |  

Abstract

This paper evaluates the performance of direct interface circuits (DIC), where the sensor is directly connected to a microcontroller, when a resistive sensor subjected to dynamic changes is measured. The theoretical analysis provides guidelines for the selection of the components taking into account both the desired resolution and the bandwidth of the input signal. Such an analysis reveals that there is a trade-off between the sampling frequency and the resolution of the measurement, and this depends on the selected value of the capacitor that forms the RC circuit together with the sensor resistance. This performance is then experimentally proved with a DIC measuring a magnetoresistive sensor exposed to a magnetic field of different frequencies, amplitudes, and waveforms. A sinusoidal magnetic field up to 1 kHz can be monitored with a resolution of eight bits and a sampling frequency of around 10 kSa/s. If a higher resolution is desired, the sampling frequency has to be lower, thus limiting the bandwidth of the dynamic signal under measurement. The DIC is also applied to measure an electrocardiogram-type signal and its QRS complex is well identified, which enables the estimation, for instance, of the heart rate. View Full-Text
Keywords: dynamic measurements; electrocardiogram; magnetoresistance; microcontroller; resistive sensor; sensor electronic interface dynamic measurements; electrocardiogram; magnetoresistance; microcontroller; resistive sensor; sensor electronic interface
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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

Sifuentes, E.; Gonzalez-Landaeta, R.; Cota-Ruiz, J.; Reverter, F. Measuring Dynamic Signals with Direct Sensor-to-Microcontroller Interfaces Applied to a Magnetoresistive Sensor. Sensors 2017, 17, 1150.

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