SparkFun CO2 Sensor - STC31 (Qwiic)

The SparkFun Qwiic STC31 Sensor is a high-performance tool designed for measuring carbon dioxide concentrations up to an impressive 100% volume. Engineered with Sensirion's state-of-the-art CMOSens® technology, this sensor ensures exceptional repeatability and long-term stability by integrating the sensor element, signal processing, and digital calibration onto a single compact chip. It features two measurement ranges: 0 to 25 vol% and 0 to 100 vol%, offering accuracy of 0.5 vol% + 3% of the measured value for the 0-25% range and 1 vol% + 3% for the 0-100% range.

This sensor is ideal for applications demanding high reliability, such as environmental monitoring, industrial safety, and scientific research. Its advanced thermal conductivity measurement principle makes it suitable for scenarios where other CO2 sensors fall short. Whether you're monitoring greenhouse gases or ensuring air quality in confined spaces, this sensor provides the precision and dependability you need.

One of the standout features is its integration with a separate SHTC3 humidity and temperature sensor, which enables fully compensated CO2 measurements that also consider atmospheric pressure. This is particularly useful for obtaining accurate data in varying environmental conditions, such as high-altitude locations.

The sensor is part of the Qwiic Connect System, ensuring effortless setup. Simply connect it to your development board using a Qwiic cable, eliminating the need for soldering. For advanced configurations, the STC31’s I2C address can be adjusted with the split-pad jumpers on the back of the board. If you plan to connect multiple sensors on the same bus, a Qwiic Mux is recommended due to the SHTC3’s fixed I2C address.

To facilitate rapid development, an Arduino library is available with example sketches, accessible through the Arduino Library Manager by searching for 'SparkFun STC3x'. This resource helps users quickly integrate the sensor into their projects, making it a versatile choice for developers and hobbyists alike.