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SparkFun CO2 Sensor - STC31 (Qwiic)

SparkFun

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SKU:
057-SEN-29260
MPN:
SEN-29260
SparkFun CO2 Sensor STC31 Qwiic board with humidity and temperature compensation
SparkFun CO2 Sensor STC31 Qwiic board with Sensirion STC31 thermal conductivity sensor and SHTC3 humidity sensor. Measures CO2 up to 100 vol% with high accuracy, fast response, and I2C Qwiic connectivity. View full description
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₹16,787.91 inc. GST
₹14,227.04 ex. GST

Technical Specifications

Brand:
SparkFun
CO2 Sensor:
Sensirion STC31
Sensing Principle:
Thermal conductivity
CO2 Measurement Ranges:
0–25 vol%, 0–100 vol%
Accuracy (0–25 vol%):
+-0.5 vol% + 3% of measured value
Accuracy (0–100 vol%):
+-1 vol% + 3% of measured value
Repeatability:
0.2 vol%
CO2 Resolution:
16-bit
Temperature Resolution:
16-bit
Temperature Measurement Range:
-20 C to +85 C
Start-up Time:
14 ms
STC31 I2C Address:
0x29 (default), 0x2A, 0x2B, 0x2C
STC31 Supply Voltage:
2.7 V min, 3.3 V typ, 5.5 V max
Humidity Sensor:
Sensirion SHTC3
Humidity Accuracy:
+-2 %RH
Temperature Accuracy (SHTC3):
+-0.2 C
Humidity Range:
0–100 %RH
SHTC3 Temperature Range:
-40 C to +125 C
SHTC3 Supply Voltage:
1.62 V min, 3.3 V typ, 3.6 V max
Interface:
I2C (Qwiic, 3.3 V max)
Target Gas:
CO2

Warranty Information

All the products supplied by Evelta are genuine and original. We offer 14 days replacement warranty in case of manufacturing defects. For more details, please visit our cancellation and returns page.

Description

Resources:

SparkFun CO2 Sensor STC31 Qwiic Board for Accurate Gas Concentration Measurement

The SparkFun CO2 Sensor – STC31 (Qwiic) is a compact, high-accuracy gas sensing module designed for precise carbon dioxide measurement in embedded and environmental monitoring applications. Built around the Sensirion STC31 thermal conductivity CO2 sensor, the board delivers calibrated gas concentration and temperature outputs, supporting both CO2 in nitrogen and CO2 in air. Its wide measurement range and fast start-up time make it suitable for laboratory equipment, HVAC systems, industrial safety, indoor air quality monitoring, and research projects where reliable CO2 data is essential.

To improve accuracy across changing environmental conditions, the board integrates a Sensirion SHTC3 humidity and temperature sensor, allowing real-time compensation for humidity and ambient temperature variations. With Qwiic I2C connectivity, configurable I2C addresses, and onboard jumpers for power LED and pull-up control, the STC31 Qwiic board is optimised for easy integration into Arduino, Raspberry Pi, and other 3.3 V I2C-based systems.

Key Features:

  • CO2 Sensor IC: Sensirion STC31 thermal conductivity CO2 sensor
  • Measurement Capability: Calibrated CO2 concentration and temperature output
  • Calibration Media: Calibrated for CO2 in nitrogen and CO2 in air
  • Wide Measurement Range: Supports 0–25 vol% and 0–100 vol% CO2 concentration
  • High Accuracy: Accurate and repeatable CO2 measurements for critical applications
  • Environmental Compensation: Integrated Sensirion SHTC3 sensor for humidity and temperature correction
  • Qwiic Interface: Dual Qwiic connectors for solder-free I2C connectivity
  • Configurable Hardware: Adjustable I2C addresses, power LED, and I2C pull-ups

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