sparkfunx/qwiic_co2_sensor-stc31

Qwiic breakout for the Sensirion STC31 CO2 sensor

SparkX CO₂ Sensor - STC31 (Qwiic)

SparkX CO2 Sensor - STC31 (Qwiic) (SPX-18385)

Do you need to be able to sense CO₂ concentrations of up to 100%? If so, the STC31 is the sensor for you! The Sensirion STC31 thermal conductivity sensor has two CO₂ measurement ranges: 0 to 25 vol%; and 0 to 100 vol%. The measurement repeatability is 0.2 vol%, with a stability of 0.025 vol% / °C. The measurement accuracy depends on the measurement range: 0.5 vol% + 3% measured value; 1 vol% + 3% measured value.

Our breakout includes a separate SHTC3 humidity and temperature sensor; allowing the STC31 to deliver humidity-compensated measurements together with improved temperature compensation. The STC31 can compensate for atmospheric pressure too - which is handy if, like us, you’re up in the mountains!

The STC3x sensor family is Sensirion’s series of Gas Concentration sensors designed for high-volume applications. The STC3x utilizes a revolutionized thermal conductivity measurement principle, which results in superior repeatability and long-term stability. This makes the STC31 a perfect choice for applications where reliability is key.

The outstanding performance of these sensors is based on Sensirion’s patented CMOSens® sensor technology, which combines the sensor element, signal processing and digital calibration on a small CMOS chip. The well-proven CMOS technology is perfectly suited for high-quality mass production and is the ideal choice for demanding and cost-sensitive OEM applications.

Repository Contents

• /Documents - datasheets etc.
• /Hardware - Eagle design files (.brd, .sch)

• LICENSE.md contains the licence information

Documentation

• STC3x Arduino Library - Arduino library for the SparkX CO2 Sensor - STC31.
• Hookup Guide - Basic hookup guide for the SparkX CO2 Sensor - STC31.

Product Versions

• SPX-18385 - Original SparkX Release.

License Information

This product is open source!

Please review the LICENSE.md file for license information.

If you have any questions or concerns on licensing, please contact technical support on our SparkFun forums.

Distributed as-is; no warranty is given.

• Your friends at SparkFun.