An Implementation of a Compact Smart Resistive Sensor Based on a Microcontroller with an Internal ADC

Czaja, Zbigniew

doi:10.1515/mms-2016-0020

Cited by 16 publications

(8 citation statements)

References 12 publications

(13 reference statements)

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“…In the literature, there are direct-microcontroller interfaces for the measurement of a single component: resistance in [15]- [18], [30], [31], [32], capacitance in [19], [20], and inductance in [21], [22]. In [33] both resistance and capacitance were measured, but for a lossy capacitive sensor where resistance and capacitance are in parallel.…”

Section: Discussionmentioning

confidence: 99%

Analysis of a Direct Microcontroller Interface for Capacitively Coupled Resistive Sensors

Areekath

George

Reverter

2021

IEEE Trans. Instrum. Meas.

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A novel approach to directly interface a capacitivelycoupled resistive sensor to a microcontroller is presented in this paper. The existing measurement schemes for such sensors are complex. In addition, the coupling capacitance often also holds important data. The proposed simple measurement system, for such series RC sensors, is capable of measuring both the resistance and the coupling capacitance. A detailed analysis on the effect of the non-idealities on the resistance measurement showed that it is independent of the accuracy of the charging capacitor, supply voltage and preset threshold voltage. The performance of the proposed scheme has been evaluated by building suitable prototypes. Initially, a setup was designed such that the measurement was not limited by the non-idealities of the microcontroller. The test results from this showed a maximum error of 0.28% and 0.96% for the resistance and capacitance measurement, respectively. The subsequent study with the microcontroller interface exhibited a maximum error of 0.91% (resistance) and 2.94% (capacitance). Noise and resolution studies have also been conducted and the results presented. The accuracy of the prototype is promising, with a measurement time of 5 ms per parameter. This is a practical, low-power, low-cost measurement system as it provides digital data on the resistance and capacitance, in series, using only a microcontroller, and a couple of passive components.

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Section: Discussionmentioning

confidence: 99%

Analysis of a Direct Microcontroller Interface for Capacitively Coupled Resistive Sensors

Areekath

George

Reverter

2021

IEEE Trans. Instrum. Meas.

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“…In conventional voltage divider method, the value of the R ref is fixed to either most likely occurring value of R s in the range or the median value of the R s range (R mid ) [14], [22]. The conventional method is also referred as a single point calibration method and cannot be applied for measurement of the wide ranged sensor because of nonlinearity problem.…”

Section: Performance Evaluation a Accuracy Improvement By Adaptive Re...mentioning

confidence: 99%

“…The simplest method among them is the R-V conversion utilizing a voltage divider concept or a resistive DC excited Wheatstone bridge. However, in the case of detecting a wide range of sensor resistance such as chemiresistive gas sensors with dynamic variation up to 5 -6 decades, this method cannot be employed due to its limitation of resistance range coverage [14]. Another strategy for R-V conversion is based on current excitation technique that forces a constant current through the sensor and measures the amplified output voltage [18]- [19], [29]- [31].…”

Section: Introductionmentioning

confidence: 99%

A Readout System for High Speed Interface of Wide Range Chemiresistive Sensor Array

Lakshminarayana

Park

et al. 2022

IEEE Access

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This paper aims at designing a compact readout system for chemiresistive sensor array with high speed and high accuracy. The proposed scheme is based on Resistance-to-Voltage (R-V) conversion and targets high density wide ranged chemiresistive sensor, with input resistance range of 1 K -1 M and 0.1% sensitivity. The proposed approach uses Adaptive Reference Resistor Tuning (ARRT) technique implemented with a digital variable potentiometer to achieve a high accuracy without sacrificing the dynamic range and the speed. The system is implemented on a printed circuit board with a microcontroller and a 16-bit Analog-to-Digital Converter (ADC), and it has a compact dimension of 10 cm × 6 cm, which is suitable for portable applications. The readout system works with a 5 V power supply, and the overall system power consumption is 150 mW. The system is designed to interface with a 118 sensor array and the experimental results achieved a satisfactory accuracy of 0.88%, as well as a measuring speed of 8.5 ms per sensor. Compared with existing approaches, our work targets a high density wide ranged chemiresistive sensor array and demonstrated high accuracy, high speed with the lowest circuit complexity, which is the novelty of this work.

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“…The availability of programmable COTS systems is helping the diffusion of smart sensing technologies, enabling developers to easily move from ideas to prototypes, from lab experiments to the production of commercial products. Examples are [10], that presents a smart voltage and current monitoring system based on ATMEG328 micro-controller, and [11] that proposes and analyzes the implementation of a compact smart resistive sensor based on a ATxmega32A4. In [12], Nhivekar and Mudholker present an embedded system for data logging and remote monitoring, whereas in [13] Mallick and Patro present a smart sensor for photoplethysmography monitoring.…”

Section: Related Workmentioning

confidence: 99%

An Open-Source Smart Sensor Architecture for Edge Computing in IoT Applications

et al. 2018

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Smart sensors are sensing devices that include computational and communication functionalities. In this work we present a reference model aimed at simplifying the implementation of smart sensors and their integration in IoT applications. The proposed model is micro-controller agnostic and it is viable in different scenarios ranging from the management of a single analog sensor to the orchestration of a heterogeneous array of sensors. The model is open-source and the implementation is available online as reference for the development of custom smart sensors. The evaluation of our framework shows that it can be implemented with limited overhead.

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An Implementation of a Compact Smart Resistive Sensor Based on a Microcontroller with an Internal ADC

Cited by 16 publications

References 12 publications

Analysis of a Direct Microcontroller Interface for Capacitively Coupled Resistive Sensors

Analysis of a Direct Microcontroller Interface for Capacitively Coupled Resistive Sensors

A Readout System for High Speed Interface of Wide Range Chemiresistive Sensor Array

An Open-Source Smart Sensor Architecture for Edge Computing in IoT Applications

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