DFRobot Gravity STCC4 SEN0678
Ready-to-integrate CO₂/RH/temperature module combining Sensirion STCC4 and SHT40 on a Gravity carrier board.
Key Specifications
Measurement Principles and Applications
Thermal conductivity CO₂ measurement senses differences in heat transport through the surrounding gas mixture. Unlike optical NDIR or photoacoustic technologies, its response depends on background gas composition and usually requires compensation for temperature, humidity and pressure. The correct calibration mixture and performance requirements vary between indoor air monitoring and high-concentration process applications.
Integration Considerations
SEN0678 is a three-parameter indoor-air module, not a 0–100 vol% process sensor. Confirm the board’s 3.3–5 V power rail, host I²C address selection, 10–40°C / non-condensing humidity limits and SHT40 compensation when integrating multiple nodes.
Source-verified model engineering details · October 2026
SEN0678 is a DFRobot Gravity carrier module containing Sensirion’s STCC4 thermal-conductivity CO₂ die and an onboard SHT40 temperature/RH element. It is materially different from ordering the bare STCC4 and designing a custom PCB.
| DFRobot module characteristic | Maker-listed value | Integration consideration |
|---|---|---|
| Board supply / interface | 3.3–5 V DC; Gravity I²C connector; selectable 0x64 or 0x65 host address | Differentiate host-visible Gravity address from the STCC4’s separate internal SHT4x compensation interface. |
| Measurement channels | CO₂ 400–5,000 ppm, ±(100 ppm + 10% reading); SHT40 temperature + RH | This is actual thermal-conductivity-derived CO₂, not VOC-inferred eCO₂; still validate the gas mixture. |
| Operating environment | 10–40°C; 20–80% RH non-condensing; 32 × 22 mm PCB | Not suitable by default for a cold duct, condensing enclosure or high-temperature industrial process. |
| Power and response | Maker’s selection chart quotes <4.8 mW at 5 V (~950 µA continuous), 1 µA deep sleep and <20 s response | Confirm the actual complete-board current for your firmware cadence, SHT40 traffic and supply; do not equate sleep and continuously measuring modes. |
Board-level installation and data-quality notes
DFRobot physically cuts away PCB material around the TC sensing die to reduce heat transfer from other circuitry. Keep this region ventilated, protect the yellow permeable membrane from scratching and organic solvents, and avoid hot regulators, fans or housing walls that could alter thermal gradients. Use the published SEN0678 software examples to confirm address selection and calibration behaviour.
Selection note: This board suits proof-of-concept IAQ nodes, educational systems and compact controlled environments. It is not presented as a calibrated industrial fixed gas safety detector. DFRobot is the carrier-board manufacturer; Sensirion produces the chip and SHT40.
Primary sources: DFRobot official SEN0678 specifications and selection chart; DFRobot integration guide; Sensirion chip data.
Official Technical Source
Independent AirAlign technical product listing. Actual features and lifecycle status must be checked against manufacturer documentation.