Description
Reviews
| 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 |
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.
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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