Minimal Wide-Range Resistive Sensor-to-Microcontroller Interface for Versatile IoT Nodes

Sensor interface is a term including all the circuits adopted for providing measurement readouts from sensor signals. Starting from early 2000s, a plethora of solutions, generally addressed as direct sensor-to-microcontroller interfaces, has been proposed. This concept is particularly intriguing giv...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2022, Vol.71, p.1-9
Main Authors: Depari, Alessandro, Bellagente, Paolo, Ferrari, Paolo, Flammini, Alessandra, Pasetti, Marco, Rinaldi, Stefano, Sisinni, Emiliano
Format: Article
Language:English
Subjects:
Current measurement
Dynamic range
Electrical measurement
Electrical resistance measurement
Electronic devices
Error analysis
Fixed resistors
Gas sensor
Interfaces
Internet of Things
Internet of Things (IoT)
light-dependent resistor (LDR)
microcontroller (μC)
Microcontrollers
Particle measurements
resistive sensor interface
Sensors
smart sensor
Time measurement
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Summary:Sensor interface is a term including all the circuits adopted for providing measurement readouts from sensor signals. Starting from early 2000s, a plethora of solutions, generally addressed as direct sensor-to-microcontroller interfaces, has been proposed. This concept is particularly intriguing given the widespread adoption of smart devices following the introduction of the Internet of Things (IoT) paradigm. However, the use of those strategies is often limited by the reduced input dynamic range they offer. In this article, authors propose a novel universal interface for resistive sensors, able to provide an overall measurement range larger than 100 dB, combining consecutive subranges leveraging on volt-amperometric and integral measurement approaches. The procedure for determining subranges is detailed; error analysis for estimating the impact of (active components) nonidealities is furnished as well. Moreover, to evaluate feasibility and obtainable performance, a proof-of-concept prototype has been implemented. In particular, a relative error of 1.31% results for fixed resistor measurements ranging from less than 1 \text{k}\Omega to more than 100 \text{M}\Omega . The capability to track slowly changing measurand (a common scenario in many IoT applications) has been also verified, given a maximum measurement time of about 0.6 s.
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2022.3175045