CO₂ Humidity and Temperature Sensor - SCD41 (Qwiic)

The SCD41 from Sensirion is a high quality Photoacoustic based CO₂ sensor capable of detecting 0 to 40000ppm with high accuracy over 400-5000ppm ±(40ppm+5%). In order to improve accuracy the SCD41 has integrated temperature and humidity sensing built-in. For additional accuracy the SCD41 also accepts ambient pressure readings!

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.

Note: The SCD41 has an automatic self-calibration routine. Sensirion recommends 7 days of continuous readings with at least 1 hour a day of 'fresh air' for self-calibration to complete.

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Comments

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  • Member #1323 / about 3 years ago / 1

    If I wanted to moisture proof this sensor, since I want to use outdoor in an enclosure that allows air to circulate what would be the best way?

    I was thinking of using heat shrink on the whole sensor and then exposing just the Sensirion metal part.

    Thanks for any help on this.

  • I was wondering why you would need your own library rather than just using the excellent ones provider by Sensirion (https://github.com/sensirion/?q=scd4x)?

  • Member #1556541 / about 3 years ago / 1

    I note from the datasheet that this board can only take one measurement every 5 minutes.

    Are there any CO2 sensing technologies that can perform accurate measurements of CO2 in much shorter durations, say once per second?

    I am looking for a sensor I can fly on a rocket. While in ascent phase, the rocket will be covering approximate 750 feet per second (200m/s for those challenged by imperial units), however, on rapid descent phase, the rocket falls at 110 fps (30m/s), and on main parachute, about 25 fps (7m/s).

    This sensor seems suitable only for static installation applications.

    • xsk8rat / about 3 years ago / 2

      You could probably read the sensor more frequently than every five minutes (as indicated by #1611467). But...

      The "response time" for the sensor, is how quickly the sensor can respond to a change in concentration. In the data sheet this is 60seconds for the CO2 reading. So, it is a slow response. The SCD30 has a response time of 20s (for CO2).

      The sensor does not appear to be targeted for quickly varying concentrations. Your application is very specialized!

    • Member #1611467 / about 3 years ago / 1

      Datasheet for the SCD4x lists "Low power operation down to < 0.4 mA avg. @ 5 V, 1 meas. / 5 minutes". Sealevel @ 3.3v CO2 60s, humidity 90s, and temperature 120s. Currently, I'm using the Sensirion SCD30 NDIR which takes a CO2, humidity, and temperature measurement every two seconds. I'm not a scientist so I don't quite understand your question. You specify velocity are you concerned about the force exerted on the sensor or recording the maximum sensor reading possible in a given amount of time? Maybe the forums are a better place for a question like this?

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