Adafruit SCD-41 - True CO2 Temperature and Humidity Sensor

The Adafruit SCD-41 is a photoacoustic true CO2 sensor that directly measures carbon dioxide concentration in ambient air with a wide measurement range of 400 to 5,000 ppm. It also includes integrated temperature and humidity sensing, providing comprehensive environmental data from a compact module.

Compared to the lower-cost SCD-40 (400–2,000 ppm range), the SCD-41 offers wider range and better accuracy, making it ideal for industrial and scientific applications where CO2 levels can get very high. Data is read over I2C with Arduino and CircuitPython libraries available for quick setup.

Key Features

• True CO2 Measurement – Photoacoustic sensing, not VOC-based estimation
• Wide Measurement Range – 400 to 5,000 ppm CO2
• Accuracy – ±(40 ppm + 5% of reading)
• Integrated Temperature & Humidity – Built-in environmental sensors for compensation and standalone readings
• I2C Interface – STEMMA QT / Qwiic connectors for solderless hookup and daisy-chaining
• 3.3 V / 5 V Compatible – Onboard 3.3 V regulator provides clean, low-ripple power for accurate readings; level shifters for 5 V logic
• Compact Form Factor – Significantly smaller than NDIR-based CO2 sensors

Also Consider

• SCD-40 CO2 Sensor – Lower-cost version with 400–2,000 ppm range, ideal for standard air quality monitoring
• SCD-30 NDIR CO2 Sensor – Larger NDIR-based sensor with 400–10,000 ppm range and ±(30 ppm + 3%) accuracy

Ideal For

• Industrial CO2 monitoring where levels exceed 2,000 ppm
• Scientific experiments and environmental research
• Smart building and HVAC systems
• Indoor air quality monitoring and ventilation studies

Package Contents

• 1× Adafruit SCD-41 True CO2, Temperature & Humidity Sensor Breakout