Adafruit
SGP41 VOC & NOx Gas Sensor Breakout
· MPN: ADA6455
Build a digital nose for indoor air quality projects with this SGP41 gas sensor breakout. The Sensirion SGP41 is a fully integrated MOX gas sensor with I2C i...
Build a digital nose for indoor air quality projects with this SGP41 gas sensor breakout. The Sensirion SGP41 is a fully integrated MOX gas sensor with I2C interfacing, so you do not need to manage heater control or analogue readings yourself.
The sensor combines two MOX hot-plate sensing elements on one chip: one for VOCs and one dedicated NOx sensing pixel. It can detect a wide range of volatile organic compounds as well as oxidising gases such as nitrogen oxides, making it useful for indoor air quality monitoring and trend comparison.
Rather than outputting TVOC or eCO2 values, the SGP41 provides raw VOC and NOx signals that are processed with Sensirion’s Gas Index Algorithm to produce VOC and NOx Index values from 1 to 500, where 100 indicates a typical indoor environment. Like all VOC and gas sensors, it has variability, so calibration against known sources is recommended for precise measurements.
Adafruit has mounted the surface-mount sensor on a STEMMA QT form factor breakout with I2C connectors on both sides, standard header pin breakouts, a 3.3V regulator and level shifting for use with 3.3V or 5V systems. Arduino library support is available for reading raw VOC and NOx signals, and a Python/CircuitPython library is available for Linux computers such as Raspberry Pi and CircuitPython boards. A QT cable is not included.
Jargon buster
Plain-language definitions for the technical terms used above.
- 3.3V regulator
- A 3.3V regulator is a power circuit that provides a steady 3.3 volts for parts that need that supply voltage. On a breakout board, it can let the sensor run safely even when the connected microcontroller or power source uses a higher voltage.
- breakout
- A breakout is a small circuit board that makes a tiny or hard-to-solder component easier to connect to with standard pins. It matters because this OLED module can be wired into a microcontroller project without needing to solder directly to the display’s fine contacts.
- CircuitPython
- A beginner-friendly version of Python designed to run directly on microcontroller boards. If a product supports CircuitPython, you can often program it by copying code files onto the board rather than setting up a more complex toolchain.
- 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.
- NOx
- NOx means nitrogen oxides, a group of gases often linked to combustion sources such as gas stoves, heaters, and vehicle exhaust. A NOx index can help show changes in indoor air quality, especially where combustion or outdoor pollution may affect the room.
- STEMMA QT
- A small plug-in connector system for I2C boards that lets you connect compatible sensors and controllers without soldering. It matters because it can make wiring faster and less error-prone, especially when adding several small modules to a project.
- VOC
- Volatile organic compounds are gases released from things like paints, cleaners, smoke, and some plastics. A VOC reading helps indicate indoor air quality, but it is usually an index or estimate rather than a direct identification of each chemical.
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