SparkFun CO2 Sensor - STCC4/SHT41 (Qwiic)

The SparkFun CO2 Sensor - STCC4/SHT40 (Qwiic) is a compact, plug-and-play air quality breakout built around the STCC4 CO₂ sensor paired with a Sensirion SHT41 temperature and humidity sensor for on-board environmental compensation. Connect via the Qwiic connector or the PTH header (GND, 3V3, SDA, SCL) and start reading calibrated CO₂ concentrations, temperature, and relative humidity over I2C in minutes — no external components required.

Designed for our Qwiic ecosystem, this 1" × 1" board plugs straight into any Qwiic-enabled microcontroller. A power LED confirms operation at a glance, and the four mounting holes make permanent installation straightforward. Whether you are monitoring indoor air quality, building a ventilation controller, or logging CO₂ trends in a greenhouse or classroom, the STCC4 delivers accurate, temperature- and humidity-compensated readings in a breadboard-friendly package.

Repository Contents

• /docs - Documentation files for GitHub pages
• /Documents - Datasheets, additional product information
• /Hardware - KiCad design files (.kicad_sch, .kicad_pcb)
• /Production - Production panel files

Documentation

• Library - Arduino library for the SparkFun CO2 Sensor - STCC4/SHT40 (Qwiic).
• Hookup Guide - Basic hookup guide for the SparkFun CO2 Sensor - STCC4/SHT40 (Qwiic).

Product Versions

• SEN-31536 - Initial release of the SparkFun CO2 Sensor - STCC4/SHT40 (Qwiic).

License Information

This product is open source!

Please review the LICENSE.md file for license information.

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

Distributed as-is; no warranty is given.

- Your friends at SparkFun.