Gas Sensor Module provides continuous, accurate CO2 monitoring to support healthy indoor air quality. Detect elevated CO2 levels to trigger ventilation, reduce stuffiness, and optimize energy use. Compact PCB module with durable components for easy mounting in walls, ceilings, or equipment enclosures. Low power operation, fast response, and calibration options ensure reliable performance over time. Compatibility: works with Arduino, Raspberry Pi, ESP32, and other microcontroller platforms; supports common interfaces. Materials and construction: rugged PCB and quality sensors designed for long life in commercial and residential environments. Use scenarios: - Home or office spaces to monitor room quality and guide ventilation. - HVAC and building automation to control fresh-air intake and conserve energy. - Classrooms, laboratories, or greenhouses to maintain safe CO2 levels for occupants and plants.