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Adafruit STCC4 + SHT41 breakout - CO2, temperature, and humidity in one small board. Good for room air monitors, smart home builds, classroom sensors, and Raspberry Pi or Arduino logging.
The STCC4 measures real CO2 via thermal conductivity, not a VOC estimate. Built for normal indoor air - Adafruit notes it isn't for scientific CO2 testing or unusual gas environments. STEMMA QT / Qwiic connectors plus header pins for breadboard use.
Specs
| Product ID | 6478 |
| Sensors | STCC4 CO2 + SHT41 temp/humidity |
| CO2 Accuracy | ±100 ppm + 10% from 400 to 5,000 ppm |
| SHT41 Accuracy | ±1.8% RH, ±0.2°C typical |
| Interface | I2C |
| STCC4 I2C Address | 0x64 (alt 0x65) |
| SHT41 I2C Address | 0x44 |
| Supply Voltage | 3.3V to 5V |
| Connector | STEMMA QT / Qwiic |
Arduino and CircuitPython/Python libraries supported.
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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