The SparkFun Indoor Air Quality Sensor - SCD41, SEN55 (Qwiic) combines two excellent indoor air quality sensors, the SCD41 and SEN55 from Sensirion™. These sensors provide a comprehensive indoor air quality sensor that measures CO2, Volatile Organic Compounds (VOCs), particulate matter (PM1.0, 2.5, 4, and 10), temperature, and relative humidity.
The SCD41 uses Sensirion's PASens® photoacoustic measurement system, which combines narrow-band IR light and a microphone inside the sensing package to detect concentrations from 0 to 40000 ppm with high accuracy over 400-5000 ppm ±(40 ppm+5%). The SCD41 has an integrated temperature and humidity CMOS® sensor to improve accuracy. For additional accuracy, the SCD41 also accepts ambient pressure readings!
The SCD41 includes an automatic self-calibration routine to adjust to its sensing environment over a seven-day calibration period. For best results, Sensirion recommends taking continuous readings for at least one hour a day of 'fresh air' to complete the calibration period. The SCD41 also has a one-shot measurement option for an optimal reduction in power consumption.
The SEN55 environmental sensor node uses Sensirion's proprietary algorithms to provide straightforward integration into various air quality monitoring applications. The sensor measures particulates of the following size specifications: PM1, PM2.5, PM4, and PM10 from a concentration of 0 to 1,000 µg/m3. It also senses both VOC and NOx indexes from 1 to 500 index points. It offers a robust set of control registers to take and report measurements, check the status of the module and its components, and report them all in easily digestible serial data ove I2C.
The SparkFun Qwiic Indoor Air Quality Combo Sensor takes care of all the pesky power requirements of the SEN55 and SCD41 with onboard DC voltage conversion, allowing a simple, single Qwiic connection for power and communication.
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