SparkFun’s new Qwiic Enabled Indoor Air Quality Sensor Combines SCD41 and SEN55 Sensors

Sparkfun has recently introduced SEN-25200, an Indoor Air Quality Sensor that combines SCD41 and SEN55 sensors and features a Qwiic connector for easy prototyping. The combination of sensors measures carbon dioxide, volatile organic compounds (VOCs), particulate matter, relative humidity, and temperature. It can be used for applications including smart homes and buildings, air purifiers, industrial and workplace monitoring, and DIY projects.

The air quality sensor board simplifies power management for the two sensors by converting DC voltage onboard. This allows for a single Qwiic connection to handle both power and communication. The board includes two Qwiic connectors and a 0.1”-space through-hole header for I2C and power connections.

Previously we have written about similar Air Quality Sensors like Renesas RRH62000, ScioSense’s ENS161, the Sensirion SGP41 Digital Air Quality Sensor, and much more feel free to check those out if you are interested in the topic.

SparkFun SEN-2520 Indoor Air Quality Sensor Specifications

• Interface:
  • I2C (Qwiic enabled)
  • 2x Qwiic connectors
  • 0.1″ spaced through-hole header
• Power Management:
  • AP3012 – 500mA/29V 1.5MHz STEP-UP DC/DC Boost Converter (for SEN55)
• SCD41 CO2 Sensor:
  • I2C Address: 0x62
  • Supply Voltage: 2.4-5.5V (3.3V typical)
  • Current Consumption:
    • Normal Mode: Max [email protected], Typ [email protected]
    • Low Power Mode: Typ [email protected]
    • Single-Shot: [email protected]
  • CO2 Output Range: 0-40,000 ppm
  • CO2 Measurement Accuracy: ±(40 ppm + 5% of reading) (400-5,000 ppm)
  • Humidity Range: 0-100% RH
  • Humidity Accuracy: ±9% RH
  • Temperature Range: -10°C to 60°C
  • Temperature Accuracy: ±1.5°C
  • Sensirion’s PASens & CMOSens Technology
• SEN55 Environmental Sensor:
  • I2C Address: 0x69
  • Supply Voltage: 4.5V
  • Average Current: 63mA
  • Max Current: 110mA
  • Particulate Matter (PM):
    • Mass Concentration Precision: ±10%
    • Mass Concentration Range: 0 – 1000 µg/m³
    • Particle Size Range: PM1.0, PM2.5, PM4, PM10
    • Lifetime: > 10 years
  • Temperature:
    • Accuracy: ±0.45°C
    • Range: -10°C to 50°C
    • Response Time (τ63%): < 60s
  • Humidity:
    • Accuracy: ±4.5% RH
    • Range: 0 – 90% RH
    • Response Time (τ63%): 20s
  • VOC:
    • Output: 0-500 VOC Index
    • Measurement Range: 0 – 1000 ppm
    • Response Time (τ63%): < 10s
    • Device-to-Device Variation: ±15%
    • Limit of Detection: < 0.05 ppm ethanol or < 10% of setpoint
    • Switch-on Time: 1 hour
    • On-chip humidity compensation
• Dimension – 3.25 x 1.75 Inch

SparkFun provides documentation to support the Indoor Air Quality Sensor, including KiCad design files for hardware customization, datasheets for the SCD41 and SEN5x sensors, and a hookup guide for easy setup. Additionally, resources like the Qwiic information page, Sensirion Arduino Core Library, and SparkFun and Sensirion Arduino libraries are available as a quick reference. The sensor has its own GitHub repository where you can find sample code and other documents.

The SEN-2520 Indoor Air Quality Sensor is priced at $125, with quantity discounts available. The product’s hookup guide offers more detailed information.

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