SparkFun Indoor Air Quality Combo Sensor - SCD41, SEN55 (Qwiic)

The SparkFun Indoor Air Quality Combo Sensor offers comprehensive real-time environmental monitoring by integrating the advanced SCD41 and SEN55 sensors. This compact board efficiently measures carbon dioxide (CO2), volatile organic compounds (VOCs), nitrogen oxides (NOx), particulate matter, temperature, and relative humidity, all within a single unit. With dimensions of approximately 8.26 x 4.45 x 2.54 cm, it is designed to deliver high-accuracy data while maintaining a minimal footprint.

Ideal for a variety of applications, this sensor board is perfect for smart home systems, HVAC monitoring, and environmental research projects. Whether you're developing an air quality alert system or optimizing ventilation in a building, the sensor's ability to simultaneously track multiple atmospheric variables makes it a versatile tool for any project.

One of the standout features is its photoacoustic CO2 sensing, which uses narrowband infrared light and an internal microphone to accurately measure CO2 levels up to 40,000 ppm. The sensor automatically calibrates over a 7-day period, ensuring long-term precision without manual intervention.

The board also excels in particulate matter detection, with the SEN55 optical sensor capable of identifying PM1.0, PM2.5, PM4, and PM10 particles ranging from 0 to 1,000 µg/m³. Its robust design promises an operational lifetime of over a decade, making it a reliable choice for continuous monitoring.

Gas index monitoring is another highlight, providing instant VOC and NOx index readings on a scale of 1 to 500. The onboard humidity compensation algorithms ensure that environmental data remains accurate and free from drift.

Powering the sensor is straightforward thanks to an onboard step-up DC/DC boost converter, which accommodates the SEN55's higher 4.5V requirements, allowing both sensors to operate from a single 3.3V power source.

Communication is simplified with a plug-and-play Qwiic connection, offering seamless data transfer over I2C without the need for soldering. For those requiring custom layouts or breadboard integration, the board also provides standard 2.54mm-spaced pins and jumper options for I2C address changes or SPI interface switching.