A Hardware Interface for MOX Gas Sensors in Air Quality Monitoring

In the context of Industry 4.0, monitoring and controlling environmental parameters and volatile organic compounds (VOCs) has become central to improving operational efficiency, ensuring product quality, and safety in production environments. The following article aims to develop a versatile, low-cost hardware interface for MOX (Metal-Oxide Semiconductor) gas sensors. The proposed architecture is based on the Arduino Giga R1 Wi-Fi and a custom-designed board developed for resistance measurement (0-500 MΩ) and temperature control of MOX gas sensors. The system also allows data to be stored locally using an SD module or transmitted wirelessly, responding to the growing demand for integrated and connected solutions. Validation was performed by comparing the response of a TiO2 film-based MOX sensor at 400 °C with reference laboratory instrumentation at different ethanol concentrations. The results obtained demonstrate a good level of agreement under the target operating conditions.