Waveshare Digital SGP40 VOC (Volatile Organic Compounds) Gas Sensor, I2C Bus

Volatile organic compounds are a key indicator of indoor air quality, released by everything from cleaning products to off-gassing furniture, and the SGP40 is a current-generation sensor purpose-built to detect them with factory calibration already applied. That calibration matters because it means the sensor delivers meaningful, comparable readings out of the box rather than needing manual calibration against a known gas source before the data means anything. The I2C interface keeps the wiring simple despite the sophistication of the underlying gas-sensing chemistry, making this a straightforward addition to any air-quality monitoring project.