SparkFun

SparkFun CO₂ Humidity and Temperature Sensor - SCD41 (Qwiic)

Name: SparkFun CO₂ Humidity and Temperature Sensor - SCD41 (Qwiic)
Brand: SparkFun
SKU: SF-SEN-22396
Price: 165.85 AUD
Availability: InStock

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This SparkFun CO2 Humidity and Temperature Sensor features the next-generation SCD41 photoacoustic CO2 sensor for high-accuracy environmental readings. The S...

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This SparkFun CO2 Humidity and Temperature Sensor features the next-generation SCD41 photoacoustic CO2 sensor for high-accuracy environmental readings. The SCD41 uses Sensirion's PASens® photoacoustic measurement system that combines narrow-band IR light and a microphone inside the sensing package capable of detecting concentrations from 0 to 40000 ppm with high accuracy over 400-5000 ppm ±(40 ppm+5%). The SCD41 has an integrated temperature and humidity CMos® sensor to improve accuracy. For additional accuracy, the SCD41 also accepts ambient pressure readings! All this functionality comes in our standard 1in. x 1in. Qwiic form factor and will seamlessly integrate into your Qwiic-based projects. However, we still routed the I2C signals out to a set of 0.1in.-spaced pins for users who prefer a soldered connection.

The SCD41 includes an automatic self-calibration routine to automatically adjust to its sensing environment over a seven-day calibration period. For best results, Sensirion recommends taking continuous readings for at least one hour a day of 'fresh air' for the calibration period to complete. This version of the SCD4X sensors also has a one-shot measurement option for an optimal reduction in power consumption.

We've written an Arduino library to make reading the CO₂, humidity, and temperature very easy. It can be downloaded through the Arduino Library manager: search for 'SparkFun SCD4x', or it can be found in the Documents tab above.

The SparkFun Qwiic Connect System is an ecosystem of I2C sensors, actuators, shields and cables that make prototyping faster and less prone to error. All Qwiic-enabled boards use a common 1mm pitch, 4-pin JST connector. This reduces the amount of required PCB space, and polarized connections mean you can’t hook it up wrong.

Get started with the SparkFun SCD4x CO
2 Hookup Guide

Features:

I2C Interface (Qwiic-enabled)
- I2C Address: 0x62
- 2x Qwiic Connectors
Supply Voltage Range: 2.4-5.5V (3.3V Typ.)
Low Current Consumption:
- Normal Mode:
  - Max: 205mA@3.3V
  - Typ: 18mA@3.3V
- Low Power Mode:
  - Typ: 3.5mA@3.3V
- Single-Shot:
  - 0.5mA@3.3V
Photoacoustic Measurement System
- Sensirion's PASens Technology
Integrated Temperature and Humidity Sensor
- Sensirion's CMOSens Technology
CO2 Output Range: 0-40,000ppm
CO2 Measurement Accuracy: ±(40ppm + 5% of reading)
- Conditions: 400-5,000ppm
Humidity Range: 0-100%RH
Humidity Accuracy: ±9%RH (Full Range)
Temperature Range: -10°C-60°C
Temperature Accuracy: ±1.5 (Full Range)

Documents:

Videos

Jargon buster

Plain-language definitions for the technical terms used above.

Automatic Self-Calibration: Automatic Self-Calibration is a built-in routine that adjusts the sensor over time to reduce drift in its readings. It matters for long-running indoor monitors because it can help keep measurements stable without frequent manual calibration.
CMOSens: CMOSens is Sensirion’s integrated sensor technology that combines sensing elements and electronics in one package. It matters because it affects how the sensor measures temperature and humidity and how it is supported by the manufacturer’s libraries and datasheets.
I2C: I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
I2C address: An I2C address is the number a device uses so a microcontroller can tell it apart from other devices on the same I2C bus. It matters because two devices with the same fixed address may conflict if used together.
PASens: PASens is Sensirion’s name for its photoacoustic sensing technology used in some CO2 sensors. Knowing this helps explain why the sensor uses light and a microphone internally rather than a simple chemical gas sensor.
PCB: A printed circuit board (PCB) is a board, usually rigid, with etched copper tracks that connect electronic components together without loose wiring. Components are mounted on the board and signals route between them through the copper layout.
photoacoustic measurement: Photoacoustic measurement detects gas by shining light into a sample and listening for tiny pressure waves created when the gas absorbs that light. In a CO2 sensor, this matters because it is the method used to estimate carbon dioxide concentration.
ppm: ppm means parts per million, a common way to express very small gas concentrations in air. For CO₂ sensors, the ppm range tells you what levels the sensor can measure, such as normal indoor air through to poorly ventilated spaces.
Qwiic: Qwiic is a plug-in connector system for I2C devices that uses small 4-pin cables, so you can connect compatible sensors without soldering. It matters because your controller or adapter also needs Qwiic, or you will need a cable or breakout to wire it up.
SCD41: A Sensirion sensor module that measures carbon dioxide, temperature, and humidity. The part number matters because library support, I2C address, accuracy, power use, and measurement range are specific to this sensor.