Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Sensor Type	NDIR (Non-Dispersive Infrared)
Measurement Range	400 ppm to 5000 ppm CO2
Accuracy	±(40 ppm + 5% MV) typical
Interface	I2C Communication Protocol
Supply Voltage	2.4V to 5.5V DC
Operating Temperature	-10°C to +60°C
Dimensions	10.0 x 10.0 x 6.5 mm
Additional Sensors	Integrated Temperature and Humidity
Calibration	Automatic Self-Calibration (ASC)
Package Content	1x SCD40/SCD41 Module, 1x Pin Header

6 reviews

Anonymous

Mar 29, 2026

Rating: 5/5

Compact and Reliable

Love how small this is compared to older MH-Z19 sensors. It fits perfectly in my compact enclosure. The added temperature and humidity data is a nice bonus.

Anonymous

Mar 23, 2026

Rating: 4/5

Great accuracy, needs warm-up time

The sensor provides very consistent data for my greenhouse monitoring system. Just remember it needs about 7 days of continuous operation for the automatic calibration to fully optimize.

Anonymous

Mar 21, 2026

Rating: 5/5

Industrial grade performance

We deployed ten of these in our office building for HVAC optimization. They have been running flawlessly for three months with no drift detected.

Anonymous

Mar 12, 2026

Rating: 5/5

Low power consumption

Ideal for battery-powered applications. The low power mode works great, allowing my device to run for weeks on a single charge while still logging CO2 levels periodically.

Anonymous

Mar 12, 2026

Rating: 4/5

Good value for money

Solid sensor for the price point. Documentation is clear, and the library support for Arduino and Python is excellent. Only wish the cable was included.

Anonymous

Mar 06, 2026

Rating: 5/5

Perfect for IoT Air Quality Projects

This module is incredibly easy to integrate with my ESP32 setup. The I2C communication is stable, and the readings match my reference meter almost perfectly. Highly recommended for hobbyists.

5 FAQ

Q: Can I use this with a 3.3V microcontroller?

A: Yes, the module operates within a voltage range of 2.4V to 5.5V, making it fully compatible with both 3.3V and 5V logic systems like ESP32, Raspberry Pi, and Arduino.

Q: What is the difference between SCD40 and SCD41?

A: The primary difference is accuracy. The SCD41 offers slightly higher accuracy (±(30 ppm + 3% MV)) compared to the SCD40 (±(40 ppm + 5% MV)). Both share the same form factor and interface.

Q: Is the pin header soldered onto the board?

A: No, the module typically comes with an unsoldered pin header strip included in the package, allowing you to choose between straight or right-angle mounting based on your project needs.

Q: Does this module require manual calibration?

A: No, the SCD40/SCD41 features Automatic Self-Calibration (ASC). However, for best results, it should be exposed to fresh air (approx. 400 ppm) for at least 7 days during initial setup.

Q: How long does it take to get the first reading after power-on?

A: The sensor requires a startup time of approximately 1 minute before the first valid CO2 measurement is available. Temperature and humidity readings may be available slightly sooner.

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