SparkFun’s $125 “Indoor Air Quality Combo Sensor” combines the SCD41 and SEN55 environmental sensors

SparkFun has released a new air quality multi-sensor board, the Indoor Air Quality Combo Sensor, which integrates the SCD41 and SEN55 sensors from Sensirion for measuring carbon dioxide, volatile organic compounds (VOCs), particulate matter, relative humidity, and temperature.

The air quality multi-sensor board simplifies power management for the two sensors via onboard DC voltage conversion and allows a single Qwiic connection for power and communication. It features two Qwiic connectors and a 0.1”-space through-hole header for I2C and power.

The board is not a complete solution for indoor air quality monitoring. It has to be connected to a Qwiic-enabled microcontroller such as SparkFun Thing Plus Matter, DataLogger IoT, and the ESP32 Qwiic Pro Mini. Users can install the required Arduino libraries — the Arduino Core library, Sensirion I2C SEN5x, and SparkFun SCD4x — either via the Arduino library manager or directly from SparkFun. The device is open-source, with hardware files, documentation, and Arduino examples hosted in a GitHub repository.

SparkFun Indoor Air Quality Combo Sensor (Qwiic) specifications:

• Sensors
  • Sensirion SCD41 CO₂ sensor with integrated temperature and humidity sensor
    •  CO₂ measurement range: 400 – 5000 ppm
    • 40000 ppm maximum value
  • Sensirion SEN55 environmental sensor node
    • Particulate matter, nitric oxide + nitrogen dioxide (NOx), volatile organic compounds (VOC), relative humidity, and temperature sensor platform
    • Supply voltage – 4.5V to 5V (5V typical)
    • Particulate matter
      • Mass concentration precision: ±10%
      • Mass concentration range: 0 – 1000μg/m³
      • Particle size range: PM1.0, PM2.5, PM4 and PM10
    • Temperature
      • Typ. temperature accuracy: 0.45°C
      • Operating temperature range: -10 – 50°C
    • Humidity
      • Typ. relative humidity accuracy: 4.5 %RH
      • Operating relative humidity range: 0 – 90 %RH
• Expansion – 2x Qwiic connectors, 0.1” spaced PTH headers
• Misc – 1x power indicator, 2x solder jumpers (PWR, I2C)
• Power
  • 3.3V via Qwiic connector
  • Onboard AP3012 – 500mA/29V 1.5MHz step-up buck-boost DC-DC converter supplying 5V to SEN55
• Dimensions – 82.55 x 44.45 mm

We have previously taken a look at other indoor air quality sensors such as the AirGradient ONE, the original Open AirGradient, and Renesas’s RRH62000 module.

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

Tomisin Olujinmi

Tomisin is a writer specializing in hardware product reviews, comparisons, and explainers. He is very passionate about small form factor and single-board computers.

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