Gravity I2C SCD41 Infrared CO2 Sensor

The DFRobot Gravity SEN0536 is a carbon dioxide sensor based on the Sensirion SCD41 and operates on the photoacoustic NDIR measurement principle (PAsens® and CMOSens® technology from Sensirion). The photoacoustic NDIR approach differs from classic NDIR sensors: Pulsed infrared radiation causes CO2 molecules to vibrate periodically, creating a pressure wave inside the measurement chamber, which is detected by a microphone. This allows the SCD41 to achieve the highest measurement accuracy while being very compact and having low power consumption.

Features:

• Photoacoustic NDIR measurement principle (Sensirion PAsens® / CMOSens®) for ±(40 ppm + 5% MV) accuracy with the smallest form factor and lowest consumption in its device class
• Three-parameter output: CO2 concentration (400–5000 ppm), temperature, and relative humidity via a single I2C bus (address 0x62)
• Low energy mode with ~1 µA sleep current and ~30 s measurement interval for battery-powered IoT sensor nodes and portable devices
• Automatic self-calibration mechanism (ASC) and single measurement mode for flexible operational scenarios
• Plug-and-play via Gravity PH2.0-4P interface; operating voltage 3.3–5 V; compatible with Arduino, ESP32, and Raspberry Pi
• Small form factor 32 × 27 × 8 mm with complete 3-in-1 sensor integration (CO2 + Temp + Humidity)

Application examples:

• Indoor air quality monitoring in offices, classrooms, and living spaces for ventilation control at elevated CO2 levels
• Smart HVAC systems that automatically increase fresh air supply when CO2 levels rise to threshold values
• Greenhouse control and plant growth optimization through accurate CO2 monitoring in the 400–5000 ppm range
• Portable data logger for indoor air measurements with single measurement mode and low energy operation on battery
• STEM educational projects for air quality measurement and climatology with easy I2C integration

Documentation:

• DFRobot Wiki – SCD41 Infrared CO2 Sensor

Technical data:

• Manufacturer: DFRobot
• Manufacturer SKU: SEN0536
• Sensor chip: Sensirion SCD41
• Measurement principle: Photoacoustic NDIR (PAsens® / CMOSens®)
• CO2 measurement range: 400–5000 ppm
• CO2 measurement accuracy: ±(40 ppm + 5% MV)
• Additional outputs: Temperature, relative humidity (On-Chip compensation)
• I2C address: 0x62 (fixed)
• Operating voltage: 3.3–5 V
• Average current: < 4 mA
• Sleep current: ~1 µA (low energy mode)
• Measurement interval (default): 5 s; low energy mode: ~30 s
• Product dimensions: 32.0 × 27.0 × 8.0 mm
• Package dimensions: 61 × 56 × 25 mm
• Gross weight: 14 g

Package contents:

• 1× Gravity I2C SCD41 Infrared CO2 Sensor
• 1× PH2.0-4P cable