Adafruit SCD-41 CO2 ANTURI STEMMA QT

Adafruit SCD-41 is a photoacoustic "true" CO₂ sensor that measures the actual carbon dioxide concentration in parts-per-million. 

The SCD-41 has a measurement range of 400–5000 ppm with an accuracy of ±(40 ppm + 5% of reading). Its wide range makes it particularly valuable in environments where CO₂ levels may rise significantly. Communication is handled over I2C, with both Arduino and CircuitPython/Python libraries available for rapid integration.

The breakout board includes STEMMA QT connectors, compatible with SparkFun Qwiic, enabling solder-free connections and daisy-chaining with other I2C devices. An onboard 3.3V regulator and level shifting circuitry allow safe use with both 3.3V and 5V logic systems.

Specifications

• Measurement range: 400–5000 ppm CO₂
• Accuracy: ±(40 ppm + 5% of reading)
• Interface: I2C, STEMMA QT / Qwiic compatible
• Operating voltage: 3.3–5 V
• Onboard 3.3V regulator and level shifting
• Compact design

Package includes

• 1 × Adafruit SCD-41 breakout (assembled and tested)
• Header strip

Links

• Product page