DFRobot
Gravity: SGP40 Air Quality Sensor
The Gravity SGP40 Air Quality Sensor uses Sensirion's SGP40 digital VOC sensor chip with built-in temperature and humidity compensation. It outputs a VOC ind...
The Gravity SGP40 Air Quality Sensor uses Sensirion's SGP40 digital VOC sensor chip with built-in temperature and humidity compensation. It outputs a VOC index (0–500) that can be used directly to evaluate indoor air quality without calibration. The Gravity interface provides plug-and-play connectivity to DFRobot controllers and other I2C-compatible boards.
With ultra-low power consumption and a fast 2-second response time, this sensor is well suited for long-running indoor installations such as air purifiers, kitchen hoods, and ventilation control systems. C and Python libraries are available.
Key Features
- SGP40 VOC Sensor – Sensirion CMOSens technology with micro-hotplate
- No Calibration Required – Built-in temperature and humidity compensation
- VOC Index Output – 0–500 scale for direct air quality indication
- Ultra-Low Power – 2.6 mA operating current
- Fast Response – 2-second response time, 10-second preheat
- Gravity Interface – I2C connection with standard Gravity cable
Ideal For
- Air purifiers and kitchen hoods
- Demand-controlled ventilation
- Thermostats and HVAC systems
- Indoor air quality monitoring
Specifications
- Power Supply – 3.3–5 V
- Operating Current – 2.6 mA
- Preheat Time – 10 s
- Response Time – 2 s
- Interface – I2C (address 0x59)
- VOC Index Range – 0–500
- Measuring Range – 0–1000 ppm (ethanol equivalent)
- Operating Temperature – -10°C to 50°C
- Operating Humidity – 0–90% RH
- Dimensions – 20 × 22 mm
Package Contents
- 1× Gravity SGP40 Air Quality Sensor
- 1× Gravity 4-Pin I2C/UART Sensor Cable
Jargon buster
Plain-language definitions for the technical terms used above.
- CMOSens
- CMOSens is Sensirion’s integrated sensor technology that combines sensing elements and electronics in one package. It matters because it affects how the sensor measures temperature and humidity and how it is supported by the manufacturer’s libraries and datasheets.
- 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.
- 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.
- UART
- UART is a simple serial connection that sends data over separate transmit and receive wires, often labelled TX and RX. It matters because this module is designed to replace a wired UART cable with a wireless link while keeping the same serial data format.
- 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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Brands
Supplier page — dfrobot.com
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