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The Adafruit STCC4 + SHT41 Sensor is a compact indoor air quality breakout for measuring CO₂, temperature, and humidity in one small board. It is a great choice for room air monitors, smart home projects, classroom sensors, ventilation alerts, and Raspberry Pi or Arduino data logging builds.
The STCC4 measures real CO₂ using thermal conductivity, unlike gas sensors that only estimate CO₂ from VOC levels. It is made for normal indoor air monitoring and works best for checking stuffy rooms, airflow, and general comfort levels. Adafruit notes that it is not meant for scientific CO₂ testing or unusual gas environments.
To improve readings, Adafruit paired the STCC4 with an SHT41 temperature and humidity sensor. The SHT41 offers typical accuracy of ±1.8% RH and ±0.2°C, helping the board read room conditions more reliably.
The board includes STEMMA QT / Qwiic connectors, so you can connect it to compatible I2C boards without soldering. It also comes with header pins for breadboard use. Adafruit provides Arduino and CircuitPython/Python library support, making it friendly for microcontrollers and single-board computers like Raspberry Pi.
Key Specs:
- Product ID: 6478
- Sensors: STCC4 CO₂ + SHT41 temperature and humidity
- CO₂ range accuracy: ±100 ppm + 10% from 400–5,000 ppm
- Interface: I2C
- Default I2C address: 0x64
- Alternate I2C address: 0x65
- SHT41 I2C address: 0x44
- Supply voltage: 3.3V to 5V
- Connector: STEMMA QT / Qwiic
- Best use: Indoor air quality monitoring
FAQ
Will this ship from Manila?
Yes — all stock ships from our Quezon City warehouse. Order before 4 PM weekdays for same-day cutoff via J&T or LBC.
Do you ship nationwide?
Yes. Metro Manila usually arrives next-day; provincial 1–3 working days.
Can I get this on a school PO or class order?
Yes — we accept Purchase Orders from accredited schools and universities. Contact us with your PO details and we'll process it.
Is this compatible with Arduino, ESP32, or Raspberry Pi?
Most parts work with common maker boards — check the description for specific pinout / voltage notes. If you're unsure, send us a message before ordering.
What's your return policy?
7-day inspection window for DOA units. Email proof of issue and we'll ship a replacement or refund. Used / installed parts are not returnable unless faulty.
Do you offer technical support?
Yes — questions land on our forum or via email, weekday or weekend. We've actually wired up most of what we sell.
Manila stock. Order before 16:00 PHT, ships today via J&T or LBC. Provincial: 1–3 working days.
Schools / class POs: we accept Purchase Orders for accredited schools and universities. contact us with your PO details.
Returns: 7-day inspection window for DOA units. Email proof of issue and we ship a replacement.
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