Adafruit BME280 I2C/SPI Temperature Humidity Pressure Sensor
SKU: TH2051
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Adafruit SCD-41 is a photoacoustic true CO2 sensor designed to measure ambient carbon dioxide directly in PPM, rather than estimating it from VOC readings. It also integrates temperature and humidity sensing, making it a practical all-in-one option for environmental monitoring projects.
Compared with the larger SCD-30, the SCD-41 uses a different measurement technique that allows a much smaller sensor element while maintaining similar overall data quality. With its 400 ppm to 5000 ppm measurement range, the SCD-41 is especially well suited for industrial, lab, scientific, and high-range CO2 measurement applications.
The breakout comes on a custom PCB with STEMMA QT connectors on both sides, compatible with SparkFun Qwiic I2C ecosystems for fast, solderless integration. It works over I2C with a wide range of microcontrollers and microcomputers, and support is available for Arduino, Python, and CircuitPython.
Technical details for Adafruit SCD-41 True CO2 Temperature and Humidity Sensor.
| Brand | Adafruit |
|---|---|
| Model | SCD-41 |
| Sensor Technology | Photoacoustic CO2 sensor |
| Integrated Sensors | CO2, temperature, and humidity |
| Measurement Range | 400 ppm – 5000 ppm |
| Accuracy | ±(40 ppm + 5 % of reading) |
| Current Consumption | 17 mA (measurement rate = 5 s) / 0.5 mA (measurement rate = 5 min) |
| Calibration | Fully calibrated and linearized |
| Interface | I2C digital interface |
| I2C Address | 0x62 |
| Input Voltage | 3.3V to 5V |
| Sensor Element Size | 10.1mm × 10.1mm × 6.5mm |
This breakout is designed for easy I2C wiring and flexible power integration. It includes an onboard 3.3V regulator and level shifting for compatibility with both 3.3V and 5V systems.
Important: this sensor prefers a quiet, low-ripple power supply. Voltage is flexible, but clean power is especially important for stable operation.
| Pin | Name | Function |
|---|---|---|
| 1 | VIN | Power input. Connect to the same power level as your microcontroller logic, such as 3V or 5V. |
| 2 | 3Vo | Output from the onboard 3.3V regulator. Can provide at least 100mA output. |
| 3 | GND | Common ground for power and logic. |
| 4 | SCL | I2C clock line. |
| 5 | SDA | I2C data line. |
STEMMA QT connectors on either side support quick solderless connections and easy chaining with other compatible I2C boards and accessories.
Advanced users can modify onboard backtraces to change regulator behaviour and I2C logic level configuration if required.
The SCD-41 directly measures true CO2 concentration in ppm using photoacoustic sensing, and it also includes integrated temperature and humidity sensing.
This sensor measures CO2 from 400 ppm to 5000 ppm. The stated accuracy is ±(40 ppm + 5% of reading).
It uses an I2C digital interface with default address 0x62. Adafruit also provides Arduino, Python, and CircuitPython support for working with the sensor.
Yes, the breakout can run from 3.3V to 5V and includes an onboard 3.3V regulator and level shifters. Adafruit notes that a quiet, low-ripple power supply is especially important for stable operation.
Yes, it comes on a STEMMA QT breakout board, and the QT connectors are compatible with SparkFun Qwiic I2C connectors. This helps with quick solderless wiring and I2C daisy-chaining.
It can be used for air quality projects, but its wider 400 to 5000 ppm range makes it especially suitable for industrial, lab, or scientific CO2 measurements where ppm levels may get higher.
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