SparkFun

SparkFun Air Quality Sensor - SGP40 (Qwiic)

Name: SparkFun Air Quality Sensor - SGP40 (Qwiic)
Brand: SparkFun
SKU: SF-SEN-18345
Price: 40.2 AUD
Availability: InStock

All Products Breakouts Gas & Air Quality Sensors New Arrivals Sensors SparkFun Environmental (temperature, humidity, air quality) Sensors & Modules SparkFun Qwiic Ecosystem

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The SparkFun SGP40 Air Quality Sensor measures volatile organic compound (VOC) levels in indoor environments using Sensirion's CMOSens technology. The metal ...

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The SparkFun SGP40 Air Quality Sensor measures volatile organic compound (VOC) levels in indoor environments using Sensirion's CMOSens technology. The metal oxide (MOx) sensor with a temperature-controlled micro hotplate provides humidity-compensated air quality readings via I2C with Qwiic connectors for easy integration.

Rather than returning specific gas concentrations, the SGP40 outputs a digital value based on common indoor VOCs. Combined with Sensirion's VOC Index Algorithm, it detects the relative intensity of VOC events compared to average readings over a 24-hour period — think of it as an electronic nose for your room.

Key Features

Sensirion SGP40 Sensor – MOx-based VOC detection with humidity compensation
Qwiic / I2C Interface – Two Qwiic connectors for daisy-chaining; I2C address 0x59
VOC Index Output – Processed output from 0–500 VOC Index points, plus raw signal (SRAW) 0–65535 ticks
Fast Start-Up – Reliably detects VOC events in under 60 seconds; meets full specifications within 1 hour
Low Power – 2.6 mA during continuous operation at 3.3 V; 34 μA idle with heater off
Long-Term Stability – Robust against contaminating gases with low drift and minimal device-to-device variation

Specifications

Operating Voltage – 1.7–3.6 V (typical 3.3 V via Qwiic)
Current (Active) – 2.6 mA at 3.3 V
Current (Idle) – 34 μA (heater off)
I2C Address – 0x59
Recommended Sampling Interval – 1 s (VOC Index); 0.5–10 s (SRAW)

Ideal For

Indoor air quality monitoring
Smart home and HVAC systems
Environmental sensing projects
Air purifier control and ventilation feedback

Package Contents

1× SparkFun SGP40 Air Quality Sensor (Qwiic)

Resources

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.
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.
I2C address: An I2C address is the number a device uses so a microcontroller can tell it apart from other devices on the same I2C bus. It matters because two devices with the same fixed address may conflict if used together.
Qwiic: Qwiic is a plug-in connector system for I2C devices that uses small 4-pin cables, so you can connect compatible sensors without soldering. It matters because your controller or adapter also needs Qwiic, or you will need a cable or breakout to wire it up.
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.