DFRobot
Gravity: SO2 Sensor (Calibrated) - I2C & UART
A factory-calibrated electrochemical sulfur dioxide (SO2) sensor with I2C, UART, and analogue output modes. Part of the DFRobot Gravity gas sensor series, th...
A factory-calibrated electrochemical sulfur dioxide (SO2) sensor with I2C, UART, and analogue output modes. Part of the DFRobot Gravity gas sensor series, this module quickly and accurately measures SO2 concentration for industrial monitoring and environmental protection applications.
The electrochemical probe offers strong interference resistance, high stability, and high sensitivity with a lifespan of over two years. The signal conversion board features 32 configurable I2C addresses, an integrated temperature compensation algorithm, and a threshold alarm function. Compatible with Arduino, ESP32, and Raspberry Pi via the Gravity 4-pin connector.
Key Features
- Factory Calibrated – Ready for accurate measurement out of the box
- Triple Output – I2C, UART (0–3V), and analogue voltage
- Electrochemical Sensing – High sensitivity with strong anti-interference capability
- 32 I2C Addresses – Configurable for multi-sensor setups on a single bus
- Temperature Compensation – Integrated algorithm for consistent readings
- Threshold Alarm – Built-in alert function for concentration limits
- 2+ Year Lifespan – Long-lasting probe in normal air conditions
- Gravity Interface – Plug-and-play 4-pin connector
Ideal For
- Industrial SO2 emissions monitoring
- Environmental air quality systems
- Safety and compliance detection equipment
- Multi-gas monitoring stations (compatible with 12 sensors in the DFRobot series)
Specifications
- Detection Gas – Sulfur Dioxide (SO2)
- Detection Range – 0–20 ppm
- Working Voltage – 3.3–5.5V DC
- Working Current – <5mA
- Output Signal – I2C, UART (0–3V), analogue voltage
- Working Temperature – –20°C to +50°C
- Working Humidity – 15–90% RH (non-condensing)
- Storage Temperature – –20°C to +50°C
- Lifespan – >2 years (in air)
- Board Size – 37 × 32mm
- Compatibility – Arduino, ESP32, Raspberry Pi
Package Contents
- 1× Gravity SO2 Signal Conversion Board
- 1× SO2 Sensor Probe
- 1× Gravity 4-Pin Cable
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- 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.
- 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.
- Temperature compensation
- Temperature compensation means the sensor adjusts its readings to reduce errors caused by changes in water temperature. This matters for field monitoring because ponds, rivers, and tanks can vary in temperature throughout the day and across seasons.
- 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.
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Brands
Supplier page — dfrobot.com
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