10th Small Systems Simulation Symposium

Join leading researchers and practitioners in the field of system simulation at the University of Niš, Faculty of Electronic Engineering

February 12-14, 2026 | University of Niš, Faculty of Electronic Engineering

Developing a serial production optical inspection system for electrical components based on ESP32 controller

https://doi.org/10.46793/SSSS2026.056B



Authors:

  • Andrija Brzaković

    Faculty of Electronic Engineering, Niš, Serbia



    The paper is available at the following link: PDF



    Abstract:

    In this paper, we present the process of designing and developing a programmable logic controller (PLC)-like system based on the ESP32 microcontroller intended for use in industrial environments. The work demonstrates the complete design flow, starting from the initial idea and system-level requirements, through schematic development, component selection, simulation and PCB design, to the final realization of a fully functional prototype integrated into an optical inspection system. The developed system performs optical inspection of electronic components transported on a conveyor belt. Defect detection is carried out using pattern-recognition algorithms and machine- learning tools integrated into state-of-the-art Cognex industrial cameras.



    Keywords:

    PCB, PLC, development, ESP32.



    REFERENCES:

    [1] M. Milić, Uvod u projektovanje elektronskih kola, Elektronski fakultet, Univerziteta u Nišu, Niš, 2024.
    [2] Texas Instruments, LM2678 SIMPLE SWITCHER® Step-Down Voltage Regulator – Datasheet, Rev. D, 2020.https://www.ti.com/lit/ds/symlink/lm2678.pdf (pristupljeno: 21.10.2025).
    [3] Texas Instruments, ISO121x Isolated 24-V to 60-V Digital Input Receivers for Digital Input Modules – Datasheet https://www.ti.com/product/ISO1212 (PDF).
    [4] ULN2003 High-Voltage, High-Current Darlington Transistor Array. Datasheet: https://www.st.com/resource/en/datasheet/uln2001.pdf
    [5] Vishay Semiconductors, 4N25 Optocoupler Datasheet: https://www.vishay.com/docs/83725/4n25.pdf



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