The Gravity: PWM Infrared CO2 Sensor is a high-precision module engineered for quantitative measurement of carbon dioxide. It operates on the principle of Non-Dispersive Infrared (NDIR) technology to deliver stable, selective, and accurate data. The sensor’s key features—high accuracy, exceptional stability, and a long service life—are backed by concrete performance metrics. With a standard indoor air quality detection range of 400 to 5000 ppm and a fine resolution of 1 ppm, it is the definitive choice for data-driven applications such as IAQ monitoring, smart HVAC systems, and scientific research.

High-Accuracy NDIR Technology

This CO2 Sensor provides precise, quantitative readings, not just estimates. The NDIR technology targets the specific absorption wavelength of CO2, ensuring high selectivity. This performance is quantified by its specifications: an accuracy of ±(50ppm + 5% of reading) and a resolution of 1 ppm. The data is reliably transmitted via a PWM output signal, providing trustworthy data for analysis and control systems.

Exceptional Long-Term Stability

Designed for continuous and reliable monitoring, this NDIR CO2 sensor maintains its performance across a wide range of real-world conditions. It operates consistently in temperatures from -10℃ to 50℃ and in humidity levels up to 95% RH (non-condensing). Featuring built-in temperature compensation and a swift response time (T90 < 120s), it exhibits minimal signal drift, reducing the need for frequent recalibration in long-term, unattended deployments.

Extended 5-Year Service Life

The robust NDIR sensor element is engineered for longevity, contributing to a service life of up to five years under normal operating conditions. This reliability is supported by an efficient electronic design, with an average current draw of just 40mA at 5V. This extended lifespan offers a lower total cost of ownership and greater peace of mind for permanent installations like smart home devices or building automation systems.

Choosing the Right CO₂ Sensor?

With different technologies like NDIR, Electrochemical, and Photoacoustic, selecting the perfect sensor can be complex. The comprehensive guide breaks down the key differences and recommends the best sensor for 5 common project scenarios.

» Read the Full 2025 CO₂ Sensor Selection Guide

Selection Guide

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

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)

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)

±(40 ppm + 5% MV)

Response Time

<20s

<90s

<30s

60s

Average Power

<4.8mW@5V (950μA continuous)

<1W

<430mW@5V

<30mW@5V

Operation Temperature

10℃ ~ 40℃

-20℃～50℃

0℃～50℃

-10℃～60℃

Operation Humidity

20 ~ 80% RH (non-condensing)

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

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Applications

Indoor Air Quality (IAQ) Monitoring: Build a device to accurately track CO2 levels in homes, offices, or classrooms to manage ventilation and improve health and productivity.
Smart Home & HVAC Systems: Integrate with HVAC systems to automatically introduce fresh air when CO2 levels rise, creating a smarter and more efficient climate control system.
Scientific & Agricultural Tech: Use in labs, greenhouses, or other controlled environments where precise CO2 concentration data is crucial for research or optimizing plant growth.

Specification

Detection Gas: Carbon Dioxide (CO2)
Power Supply: 5.0±0.1V DC
Average Current: 40mA@5V
Output Signal: PWM
Detection Range: 400～5000 ppm
Resolution: 1ppm
Accuracy: ±(50ppm+5% rdg)
Response Time: T90 < 120s
Working Temperature: -10℃～50℃
Working Humidity: 0～95%RH (non-condensing)
Dimensions: 69×37mm / 2.72×1.46″

Shipping List

Gravity: PWM Infrared CO2 Sensor (400-5000 ppm) x1
Digital Sensor Cable for Arduino x1

MAECENAS IACULIS

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