DFRobot
Gravity: STCC4 True Carbon Dioxide (CO2) Sensor (3-in-1 Air Quality Monitoring, 400 ~ 5000ppm)
· MPN: SEN0678
This Gravity air quality module uses Sensirion’s STCC4 gas sensing chip to directly measure carbon dioxide with the thermal conductivity measurement principl...
This Gravity air quality module uses Sensirion’s STCC4 gas sensing chip to directly measure carbon dioxide with the thermal conductivity measurement principle. It is designed for compact, cost-effective indoor monitoring nodes where stable CO₂ readings are needed without complex hardware integration.
An onboard SHT40 sensor adds ambient temperature and humidity measurement, giving you three environmental values from one module. The temperature and humidity data are also used for automatic compensation of CO₂ readings, while the built-in Automatic Self-Calibration algorithm supports long-term stability.
The module communicates over a standard Gravity I2C interface and operates from 3.3 V to 5 V, making it suitable for Arduino, ESP32 and Raspberry Pi projects. The plug-and-play Gravity connector helps avoid soldering, breadboards and level-shifting in typical setups.
It is supplied with the Gravity STCC4 CO2 Sensor x1 and Gravity 4Pin Cable x1, and is well suited to indoor air quality monitors, HVAC automation, smart home systems, classrooms, IoT nodes and STEM experiments.
Features:
- High measurement accuracy: Based on the TC principle for stable and reliable data
- Low power consumption: Suitable for battery-powered or always-on systems
- Compact size: Easy to integrate into space-constrained and modular design
- Digital output: I2C interface with strong anti-interference capability
- Plug and play: Standard Gravity interface, no soldering required
Specifications:
- Supply Voltage: 3.3–5.0 V DC
- Operating Temperature: 10°C ~ 40°C
- Operating Humidity: 20% ~ 80% RH (non-condensing)
- Operating Current Peak: 4.2 mA
- Operating Current Continuous Measurement: 950 μA
- Operating Current Single-shot Mode: 100 μA (10s sampling interval)
- Operating Current Deep Sleep: 1 μA
- CO₂ Measurement Range: 400–5000 ppm
- CO₂ Accuracy: ±(100 ppm + 10% of reading)
- Response Time: 20 s
- Interface: Gravity I2C
Jargon buster
Plain-language definitions for the technical terms used above.
- Automatic Self-Calibration
- Automatic Self-Calibration is a built-in routine that adjusts the sensor over time to reduce drift in its readings. It matters for long-running indoor monitors because it can help keep measurements stable without frequent manual calibration.
- deep sleep
- Deep sleep is a low-power mode where the microcontroller turns off most functions while keeping just enough circuitry active to wake up later. It is important for battery-powered projects because it can greatly extend how long the device runs between charges.
- ESP32
- ESP32 is a family of microcontroller modules with built-in wireless features such as Bluetooth and WiFi. Knowing this product uses an ESP32-based module helps explain how it provides wireless serial communication and firmware update features.
- Gravity
- Gravity is DFRobot’s plug-in connector system for sensors, motors and modules, using standard cables to reduce loose jumper wiring. It matters because Gravity-compatible parts can connect directly to these ports, while non-Gravity parts may need adapters or manual wiring.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- IoT
- Short for Internet of Things, meaning physical devices that connect to networks or the internet to send data or be controlled remotely. It matters if you want projects such as connected sensors, remote controls or classroom data-logging activities.
- ppm
- ppm means parts per million, a common way to express very small gas concentrations in air. For CO₂ sensors, the ppm range tells you what levels the sensor can measure, such as normal indoor air through to poorly ventilated spaces.
- SHT40
- SHT40 is a Sensirion temperature and humidity sensor included on the module. It matters because the board can report room temperature and humidity as well as use those readings to improve the CO₂ measurement.
- STCC4
- STCC4 is the specific Sensirion gas-sensing chip used on this module to measure carbon dioxide. Knowing the chip helps you find compatible libraries, datasheets, and performance details before using it in a project.
- Thermal conductivity measurement
- Thermal conductivity measurement estimates gas concentration by detecting how well the surrounding air conducts heat. For a CO₂ sensor, this tells you the module is using a direct physical sensing method rather than estimating CO₂ from other air-quality signals.
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