Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Sensor Type	NDIR (Non-Dispersive Infrared)
Measured Gas	Carbon Dioxide (CO2)
Measurement Range	400 ppm to 5000 ppm
Accuracy	±(40 ppm + 5% mv)
Interface	I2C Communication
Operating Voltage	2.4V to 5.5V
Additional Sensors	Temperature and Humidity
Dimensions	10.1 x 10.1 x 6.5 mm
Power Consumption	Typical 18 mA during measurement
Mounting Style	SMD / Module with Header Pins

6 reviews

Anonymous

Mar 30, 2026

Rating: 5/5

Best NDIR sensor in this price range

I have tested several modules, and the SCD41 offers the best balance of size, accuracy, and ease of use. The automatic baseline correction feature works well.

Anonymous

Mar 28, 2026

Rating: 5/5

Professional Grade Performance

Using this for a prototype ventilation controller. The response time is quick when CO2 levels spike, and the power consumption is low enough for battery-operated devices.

Anonymous

Mar 21, 2026

Rating: 4/5

Good value but documentation could be better

The hardware works flawlessly, but finding specific register maps for advanced features took some digging in the datasheet. Once configured, it runs perfectly.

Anonymous

Mar 16, 2026

Rating: 5/5

Compact and Reliable

Love how small this is compared to older MH-Z19 sensors. The combined temperature and humidity data is a nice bonus that saves space on my PCB.

Anonymous

Mar 15, 2026

Rating: 4/5

Great accuracy, needs warm-up time

The sensor provides consistent data for my greenhouse monitoring system. Just remember it needs about 7 days of operation in fresh air for the initial calibration to settle completely.

Anonymous

Mar 14, 2026

Rating: 5/5

Perfect for IoT Air Quality Projects

This module is incredibly easy to integrate with ESP32 boards. The I2C communication is stable, and the CO2 readings match my reference meter very closely. Highly recommended for home automation.

5 FAQ

Q: What is the expected lifespan of the sensor?

A: The sensor is designed for a long operational life, typically exceeding 10 years under normal operating conditions, as the NDIR technology does not consume the sensing element.

Q: Does this module require an external pull-up resistor for I2C?

A: Most breakout boards include onboard pull-up resistors. If you are using the bare module, you will need to add external pull-up resistors to the SDA and SCL lines.

Q: Can this sensor detect carbon monoxide (CO)?

A: No, the SCD40/41 is designed specifically for Carbon Dioxide (CO2) detection. It cannot detect Carbon Monoxide (CO).

Q: How do I perform a forced recalibration?

A: Forced recalibration should only be done if you have a known accurate reference concentration. You can trigger it via the I2C command set detailed in the official datasheet under the FRC section.

Q: Is it compatible with 3.3V logic microcontrollers?

A: Yes, the module operates between 2.4V and 5.5V, making it fully compatible with both 3.3V and 5V logic microcontrollers like ESP32, ESP8266, and Arduino.

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