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CO₂ Humidity and Temperature Sensor - SCD40 (Qwiic)

SKU 4510
Save 22%
Original Price £65.99 inc VAT
Current Price £51.29 inc VAT
£42.74 ex VAT
1 in stock.

This SparkFun CO2 Humidity and Temperature Sensor features the next-generation SCD40 photoacoustic CO2 sensor for high-accuracy environmental readings. The SCD40 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 400-2000 ppm ±(50 ppm+5%). The SCD40 has an integrated temperature and humidity CMos® sensor to improve accuracy. For additional accuracy, the SCD40 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 SCD40 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.

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. The link can be found in the Resources tab above.

  • I2C Interface (Qwiic-enabled)
    • I2C Address:0x62
    • 2x Qwiic Connectors
  • Supply Voltage Range:2.4-5.5V(3.3VTyp.)
  • 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
  • CO2Output Range: 0-40,000ppm
  • CO2Measurement Accuracy: ±(50ppm + 5% of reading)
    • Conditions: 400-2,000ppm
  • Humidity Range: 0-100%RH
  • Humidity Accuracy: ±9%RH (Full Range)
  • Temperature Range: -10°C-60°C
  • Temperature Accuracy: ±1.5 (Full Range)