Romanian Journal of Information Science and Technology (ROMJIST)

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ROMJIST is a publication of Romanian Academy,
Section for Information Science and Technology

Editor – in – Chief:

Academician Dan Dascalu

Secretariate (office):
Adriana Apostol
Adress for correspondence: romjist@nano-link.net (after 1st of January, 2019)

Editing of the printed version: Mihaela Marian (Publishing House of the Romanian Academy, Bucharest)

Technical editor
of the on-line version:
Lucian Milea (University POLITEHNICA of Bucharest)

Sponsors:
• National Institute for R & D
in Microtechnologies
(IMT Bucharest), www.imt.ro
• Association for Generic
and Industrial Technologies (ASTEGI), www.astegi.ro

ROMJIST Volume 24, No. 2, 2021, pp. 222-232, Paper no. 690/2021
 

Matei SERBANESCU, Vlad-Mihai PLACINTA, Florin NASTASE, Gheorghe PRISTAVU, Octavian BUIU, Gheorghe BREZEANU, Bogdan SERBAN
A Standalone System for Resistive Smart Sensors Based on a Wheatstone Quarter-Bridge

ABSTRACT: This paper presents the architecture of a resistive smart-sensor based on a Wheatstone quarter-bridge. The overall system also comprises a signal-conditioning circuit and a microcontroller. The intended sensing element is a small-variation chemo-resistive sensor. Its resistance gradient is converted by the conditioning circuit into a signal with variable duty-cycle. The proposed architecture is theoretically analyzed and validated by both simulations and measurements on a prototype, implemented with discrete and low-cost components. The output signal exhibits a maximum of 1.8% relative error, for a sensing element value variation of 10 Ω. Sensing linearity is assessed via R2 at up to 0.9995, while sensitivity reaches 57.71 μs/Ω.

KEYWORDS: Resistive sensor, quarter-bridge, signal-conditioning circuit, microcontroller, duty-cycle

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