DEVELOPMENT AND EXPERIMENTAL VALIDATION OF A MICROCONTROLLER-BASED STRAIN GAUGE SYSTEM FOR MONITORING THE ELASTIC-DEFORMED STATE OF STRUCTURAL ELEMENTS

Д. І. Конотоп, Р. Б. Нікітін

Abstract


The paper investigates the feasibility of using low-cost microcontroller platforms to build a strain-gauge measurement system. A measurement scheme based on the ESP32 microcontroller and the 24-bit HX711 analog-to-digital converter was implemented for measuring deformations of a cantilever beam made of 6063 (AD-31) aluminum alloy. Software for real-time visualization of measurement results was developed. Field calibration of the system was performed using linear regression. Determination coefficients R² > 0.9997 were obtained, confirming the high linearity of the response. The long-term stability of the system was investigated over a period of one year: a zero-value drift was recorded while the sensitivity of the measurement channels was preserved. Possible causes of drift were analyzed, and recommendations for improving measurement stability were formulated. A concept of a multi-level architecture for the application of the system under operational conditions of aircraft structures was elaborated.


Keywords


strain gauge measurements; field calibration; mechanical deformation; structural element; structural health monitoring.

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DOI: https://doi.org/10.32620/oikit.2026.108.13

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