DFRobot - Gravity: I2C SCD41 Infrared Carbon Dioxide / CO2 Sensor (400 - 5000 ppm)

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

This Gravity: SCD41 CO2 sensor 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.

Click to learn more about PAsens® technology.

Click to learn more about NDIR sensors.

CO2 Sensor Selection Guide

Product Name

Gravity: STCC4 Carbon Dioxide (CO2) Sensor (3-in-1 Air Quality Monitoring, 400 ~ 5000ppm)

Gravity: Analog Electrochemical Carbon Dioxide / CO2 Sensor (0-10000 ppm)

Gravity: UART Infrared Carbon Dioxide / CO2 Sensor (0-50000 ppm)

Gravity: PWM Infrared Carbon Dioxide / CO2 Sensor (400-5000 ppm)

Gravity: I2C SCD41 Infrared Carbon Dioxide / CO2 Sensor (400 - 5000 ppm)

Figure

SKU

SEN0678

SEN0159

SEN0220

SEN0219

SEN0536

Operation Voltage

3.3 ~ 5V

3.7～5V

4.5～5.5V

4.5～5.5V

3.3V-5V

Output

Gravity: I2C

Gravity: Analog (Analog2.7～4.1V) + 3P Header Digital Output(Alarm):0～VCC Level

Gravity: Analog (Analog Output 0.4～2V)

Gravity: UART (0～3.3V Level)

Gravity: I2C

Measurement Principle

Thermal Conductivity (TC)

Electrochemistry (Solid electrolyte battery principle)

NDIR (non-dispersive infrared)

NDIR (non-dispersive infrared)

photoacoustic NDIR

Measurement Range

400 ~ 5000 ppm

0～10000 ppm

0~50000 ppm

400~5000 ppm

400～5000 ppm

Accuracy

±(100 ppm + 10% of reading)

±100ppm@400ppm

±(100ppm + 6% readings)

±(100ppm + 6% readings)

±(40 ppm + 5% MV)

Response Time

60s

Average Power

Operation Temperature

10℃ ~ 40℃

-20℃～50℃

0℃～50℃

0℃～50℃

-10℃～60℃

Operation Humidity

20 ~ 80% RH (non-condensing)

0～95% RH (No condensation)

0～95% RH (No condensation)

0～95% RH (No condensation)

0～95% RH (No condensation)

Dimension (PCB)

32*22 mm

32*42 mm

37*69 mm

21*27.1 mm

32*27*8mm

Features

1. 3-in-1 (CO2, Temp, Humidity) 2. High cost-effectiveness 3. Low power (1μA sleep) 4. Auto compensation 5. I2C Plug and play

1. Large Range 2. Adjustable Alarm Threshold 3. Fast Response 4. Analog Output

1. High Accuracy 2. Long Lifespan 3. Auto Temperature Compensation 4. Water Vapor Interference Resistance 5. Ananglog Output

1. High Accuracy 2. Large Range 3. Long Lifespan 4. Auto Temperature Compensation 5. Water Vapor Interference Resistance 6.3.3V UART Output

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

Add to Cart

• CO2, temperature, and humidity, three in one
• Small size of 32*27*8mm
• Low power, average current＜4mA

• Indoor CO2 concentration monitoring
• Ambient monitoring in greenhouse
• Smart ventilation systems

• Power Supply: 3.3V to 5V
• Average Operating Current: ＜4mA
• I2C Address: 0x62
• Product Size: 32*27*8mm/1.26×1.06×0.31"

CO2

• Accuracy: ±(40 ppm + 5% MV)
• Measuring Range: 400 - 5000 ppm
• Response Time: 60s

Humidity

• Typical Relative Humidity Accuracy: 6%RH
• Relative Humidity Measuring Range: 0 to 95%RH
• Response Time: 120s

Temperature

• Typical Temperature Accuracy: 0.8℃
• Temperature Measuring Range: -10 to 60℃
• Response Time: 120s

• Gravity: SCD41 Infrared CO2 Sensor x1
• Gravity-4P I2C/UART Sensor Cable x1