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CO₂ Humidity and Temperature Sensor - SCD41 (Qwiic)
A high-quality photoacoustic CO₂ sensor breakout based on the Sensirion SCD41, with integrated temperature and humidity sensing. The SCD41 detects CO₂ levels...
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A high-quality photoacoustic CO₂ sensor breakout based on the Sensirion SCD41, with integrated temperature and humidity sensing. The SCD41 detects CO₂ levels from 0 to 40,000 ppm with high accuracy over the 400–5,000 ppm range (±40 ppm + 5%). It also accepts ambient pressure readings for improved accuracy.
Features a Qwiic connector for plug-and-play I²C connectivity with no soldering required. An Arduino library is available for easy reading of CO₂, humidity, and temperature values.
Key Features
- Sensirion SCD41 – Photoacoustic CO₂ sensor with high accuracy
- CO₂ Range: 0–40,000 ppm (±40 ppm + 5% over 400–5,000 ppm)
- Integrated Temperature & Humidity – Three measurements from one sensor
- Ambient Pressure Compensation – Accepts external pressure readings for improved accuracy
- Qwiic Connector – Plug-and-play I²C, no soldering required
- Automatic Self-Calibration – Calibrates over time with exposure to fresh air
Ideal For
- Indoor air quality monitoring
- HVAC and ventilation control
- Environmental sensing projects
- Smart home and IoT applications
Package Contents
- 1× SCD41 CO₂ Humidity and Temperature Sensor (Qwiic)
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- Automatic Self-Calibration
- Automatic Self-Calibration is a built-in routine that adjusts the sensor over time to reduce drift in its readings. It matters for long-running indoor monitors because it can help keep measurements stable without frequent manual calibration.
- 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.
- IoT
- Short for Internet of Things, meaning physical devices that connect to networks or the internet to send data or be controlled remotely. It matters if you want projects such as connected sensors, remote controls or classroom data-logging activities.
- 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.
- SCD41
- A Sensirion sensor module that measures carbon dioxide, temperature, and humidity. The part number matters because library support, I2C address, accuracy, power use, and measurement range are specific to this sensor.
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