Adafruit
Adafruit SCD-43 True CO2, Temperature & Humidity Sensor
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This compact breakout measures true ambient CO2 concentration using photoacoustic sensor technology, rather than estimating CO2 from VOC gas concentration. I...
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This compact breakout measures true ambient CO2 concentration using photoacoustic sensor technology, rather than estimating CO2 from VOC gas concentration. It reports CO2 in parts per million and also includes integrated temperature and humidity sensing, making it useful for indoor air quality, ventilation studies, environmental sensing and scientific experiments.
The SCD-43 is the latest wide-range variant in the SCD-4x family, with a 400~5000 ppm CO2 range and improved accuracy compared with earlier versions described by the supplier. It also supports single-shot measurements and is designed for demanding indoor air quality applications.
Adafruit has mounted the sensor on a custom STEMMA QT form-factor PCB with I2C data, so it works nicely with many microcontrollers and microcomputers. STEMMA QT connectors on both sides are compatible with SparkFun Qwiic I2C connectors, enabling solderless connections or chaining with other compatible sensors and accessories.
The board can run from 3.3 to 5V and includes a 3.3V regulator plus level shifters to help provide a quiet supply and suit 5V microcontrollers such as an Arduino UNO. Arduino and Python/CircuitPython code is available to help you get started quickly, and advanced users can cut or solder backtraces to change regulator and I2C logic-level behaviour.
Specifications:
- Sensor technology: Photoacoustic CO2 sensor technology
- Integrated sensors: Integrated temperature and humidity sensor
- Measurement range: 400 ppm – 5000 ppm
- Accuracy: ±(30 ppm + 3.0 % of reading)
- Response Time: 60s
- Current consumption: 17 mA (meas. rate = 5 s) / 0.5 mA (meas. rate = 5 min)
- Calibration: Fully calibrated and linearized
- I2C digital interface address: 0x62
- Sensor Element Size: 10.1mm x 10.1mm x 6.5 mm
- Product Dimensions: 25.5mm x 22.8mm x 8.0mm / 1.0" x 0.9" x 0.3"
- Product Weight: 2.7g / 0.1oz
Ideal for maker and research projects that need real CO2 readings over I2C with easy STEMMA QT or Qwiic wiring.
Jargon buster
Plain-language definitions for the technical terms used above.
- 3.3V regulator
- A 3.3V regulator is a power circuit that provides a steady 3.3 volts for parts that need that supply voltage. On a breakout board, it can let the sensor run safely even when the connected microcontroller or power source uses a higher voltage.
- breakout
- A breakout board carries a small or fine-pitched component and brings its connections out to standard, breadboard- and header-friendly pins. Describing a part as a breakout means it can be wired into a project without soldering directly to the component's tiny contacts.
- CircuitPython
- A beginner-friendly version of Python designed to run directly on microcontroller boards. If a product supports CircuitPython, you can often program it by copying code files onto the board rather than setting up a more complex toolchain.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- PCB
- A printed circuit board (PCB) is a board, usually rigid, with etched copper tracks that connect electronic components together without loose wiring. Components are mounted on the board and signals route between them through the copper layout.
- ppm
- ppm means parts per million, a common way to express very small gas concentrations in air. For CO₂ sensors, the ppm range tells you what levels the sensor can measure, such as normal indoor air through to poorly ventilated spaces.
- Qwiic
- Qwiic is a plug-in connector system for I2C devices that uses small 4-pin cables, so you can connect compatible sensors without soldering. It matters because your controller or adapter also needs Qwiic, or you will need a cable or breakout to wire it up.
- STEMMA
- A plug-and-cable connection system used on some maker electronics boards to make wiring simpler. If a product uses STEMMA, you need the matching cable or connector type to plug it in without soldering.
- STEMMA QT
- A small plug-in connector system for I2C boards that lets you connect compatible sensors and controllers without soldering. It matters because it can make wiring faster and less error-prone, especially when adding several small modules to a project.
- VOC
- Volatile organic compounds are gases released from things like paints, cleaners, smoke, and some plastics. A VOC reading helps indicate indoor air quality, but it is usually an index or estimate rather than a direct identification of each chemical.
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Supplier page — adafruit.com
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SCD4x Sensor Datasheet
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