The SparkFun STC31 is a high-precision, Qwiic-enabled sensor that accurately measures extreme CO₂ concentrations up to 100% volume.
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Need to measure high concentrations of carbon dioxide? When standard CO2 sensors won't cut it, the SparkFun Qwiic STC31 Sensor is your solution. This powerful sensor from Sensirion is designed to measure CO2 concentrations all the way up to a staggering 100% volume!
The STC31 is built for applications where reliability is key. It uses a revolutionary thermal conductivity measurement principle, combined with Sensirion's patented CMOSens® technology, to deliver superior repeatability and long-term stability. This means the sensor element, signal processing, and digital calibration are all integrated onto a single tiny chip.
For best-in-class performance, we've integrated a separate SHTC3 humidity and temperature sensor right on the board. This allows the STC31 to provide fully compensated CO2 measurements that also account for atmospheric pressure — a crucial feature for reliable data, which is handy if, like us, you’re up in the mountains!
As part of the SparkFun Qwiic Connect System, this board is incredibly easy to use. Simply plug it into your development board with a Qwiic cable and you're ready to go—no soldering required! For advanced users, the STC31’s I2C address can be configured using the split-pad jumpers on the back of the board. The SHTC3’s I2C address is non-configurable; you will need a Qwiic Mux if you want to connect multiple sensors to the same bus.
Our Arduino library contains example sketches for the Arduino IDE to get you up and running quickly. It can be downloaded through the Arduino Library manager: search for 'SparkFun STC3x', or it can be found in the Documents tab above.
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