SparkFun CO₂ Humidity and Temperature Sensor - SCD41 (Qwiic)

The SparkFun SCD41 Qwiic breakout features Sensirion's photoacoustic CO₂ sensor with integrated temperature and humidity measurement. Using the Qwiic connector system, you can easily daisy-chain this sensor with other I²C devices without soldering.

The SCD41 measures CO₂ concentrations from 400 to 40,000 ppm and includes automatic self-calibration over a 7-day period for long-term accuracy. Multiple power modes let you optimise for battery-powered applications.

Key Features

• CO₂ Measurement – Photoacoustic sensing from 400–40,000 ppm
• Temperature & Humidity – Integrated environmental sensors
• Qwiic Connector – Plug-and-play I²C with daisy-chaining
• Low Power Modes – Single-shot mode draws only 0.5mA
• Auto Calibration – 7-day automatic self-calibration
• Arduino Library – Easy data reading with SparkFun library

Specifications

• CO₂ Range: 400 – 40,000 ppm
• Sensor: Sensirion SCD41
• Interface: I²C (Qwiic)
• Voltage: 3.3V
• Current: 18mA typical, 0.5mA single-shot mode

Ideal For

• Indoor air quality monitoring
• HVAC systems
• Smart building sensors
• Environmental data logging

Resources

• SparkFun Product Page