CO2 is a key factor for indoor air quality as high levels compromise the human cognitive performance and well-being.

This DFRobot Gravity: I2C SCD41 Infrared CO2 Sensor (400 – 5000 ppm) is based on the SCD41 miniature CO2 sensor from Sensirion. SCD41 builds on the photoacoustic NDIR sensing principle and Sensirion’s patented PAsens® and CMOSens® technology to offer high accuracy at an unmatched price and the smallest form factor. On-chip signal compensation is realized with the built-in temperature and humidity sensor, while temperature and humidity data outputs are also available.

SCD41 sensor detects the amount of energy that is absorbed by CO2 molecules. When pulsing the infrared emitter, CO2 molecules absorb infrared light periodically. This causes additional molecular vibration resulting in a pressure wave inside the measurement chamber. The higher the CO2 concentration, the more light is absorbed, and thus the greater the amplitude of this acoustic wave becomes. A microphone inside the gas chamber measures this, from which the CO2 concentration can then be calculated.

Useful Link:

https://wiki.dfrobot.com/SKU_SEN0536_Gravity_SCD41_Infrared_CO2_Sensor

Applications:

1. Indoor CO2 concentration monitoring
2. Ambient monitoring in the greenhouse
3. Smart ventilation systems

Features:

1. CO2, temperature, and humidity, three in one
2. The small size of 32*27*8mm
3. Low power, average current＜4mA

Package Includes:

1 x Gravity: SCD41 Infrared CO2 Sensor

1 x Gravity-4P I2C/UART Sensor Cable