SparkFun Qwiic STC31 CO₂ Sensor คือโมดูลตรวจวัดก๊าซคาร์บอนไดออกไซด์ประสิทธิภาพสูงที่สามารถวัดความเข้มข้นได้ทั้งช่วง 0–25 vol% และ 0–100 vol% ด้วยความแม่นยำและความเสถียรระยะยาว ใช้เทคโนโลยี Thermal Conductivity ร่วมกับ CMOSens® ของ Sensirion ทำให้ได้ผลลัพธ์ที่เชื่อถือได้เสมอ นอกจากนี้ยังมีเซ็นเซอร์ SHTC3 สำหรับวัดอุณหภูมิและความชื้นเพื่อชดเชยค่า CO₂ โดยอัตโนมัติ ตัวบอร์ดรองรับการเชื่อมต่อผ่านระบบ Qwiic I²C ใช้งานง่ายแบบ Plug-and-Play โดยไม่ต้องบัดกรี เหมาะอย่างยิ่งสำหรับงานวิจัย การตรวจสอบสิ่งแวดล้อม และการประยุกต์ใช้ในอุตสาหกรรมที่ต้องการข้อมูลแม่นยำและเชื่อถือได้
Quick Information
Product Overview
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.
Expected CO2 Accuracy Ranges
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Two CO2 Measurement Ranges: 0 to 25 vol% and 0 to 100 vol%
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Measurement Repeatability: 0.2 vol%
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Accuracy (0-25% range): 0.5 vol% + 3% of measured value
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Accuracy (0-100% range): 1 vol% + 3% of measured value
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!
Plug-and-Play with Qwiic
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.
Features
- Sensirion STC31 CO2 Sensor
- Thermal conductivity sensor provides calibrated gas concentration and temperature output
- Calibrated for: CO2 in N2; and CO2 in air
- Measurement ranges: 0 to 25 vol%; 0 to 100 vol%
- Accuracy: 0.5 vol% + 3% measured value; 1 vol% + 3% measured value
- Repeatability: 0.2 vol%
- Temperature measurement range: -20 °C to +85 °C
- Concentration and temperature resolution: 16-bit
- Start-up time: 14 ms
- I2C address (configurable): 0x29 (default), 0x2A, 0x2B, 0x2C
- Supply Voltage: 2.7VMin, 3.3VTyp, 5.5VMax
- Note: Qwiic bus operates at 3.3VMax
- Sensirion SHTC3 Humidity and Temperature Sensor
- Allows the STC31 to compensate for humidity and temperature
- Typical accuracy: ±2 %RH and ±0.2 °C
- Specified humidity range (extended): 0 to 100 %RH
- Specified temperature range: -40 °C to +125 °C
- I2C address (non-configurable): 0x70
- Supply Voltage: 1.62VMin, 3.3VTyp, 3.6VMax
- Note: Qwiic bus operates at 3.3VMax
- Dual Qwiic connectors
- Power LED (configurable)
- I2C pull-ups (configurable)
Documents: