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 below.
- 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
- Normal Mode:
- 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)