SparkFun SGP40 Air Quality Sensor

SparkFun SGP40 Air Quality Sensor is designed to measure the quality of air in a limited enclosed space. The SGP40 is based on Sensirion’s CMOSens^® technology. It combines a metal oxide (MOx) sensor with a temperature-controlled micro hotplate to offer a humidity-compensated volatile organic compound (VOC) based indoor air quality signal. The sensing element and VOC Algorithm feature unmatched robustness against contaminating gases present in real-world applications. Additionally, this enables exceptional long-term stability and low drift with a device-to-device variation.

The SparkFun SGP40 Air Quality Sensor does not return specific concentrations of VOC gases. The device outputs a digital value based on common VOC gases present in an indoor environment. This value, combined with Sensirion’s VOC Index Algorithm, detects the relative intensity of VOC events in relation to the average readings in a 24hr period.

The SGP40 communicates via I²C with break-out pins to Qwiic connectors for easy connections.

Features

Uses I²C interface (Qwiic-enabled)
- 0x59 I²C Address
- 2x Qwiic connectors
Operating voltage range
- 1.7V to 3.6V (Typ. 3.3V)
- Qwiic interface provides 3.3V
Typical current consumption:
- 2.6mA during continuous operation (at 3.3V)
- 34µA when idle (heater off)

Output signal:
- 0 – 65535 ticks Digital raw value (SRAW)
- 0 – 500 VOC Index points Digital processed value (VOC Index)
Switch-on behavior:
- <60s Time until reliably detecting VOC events
- <1h Time until specifications are met
Recommended sampling interval:
- 1s VOC Index
- 0.5s – 10s (Typ. 1s) SRAW

Resources

Schematic
Eagle Files
Board Dimensions
Hookup Guide
Sensirion SGP40 Datasheet
Sensirion VOC Index for Experts

Sensirion SGP40 Design In Guide
SGP40 Quick Testing Guide
Qwiic Information Page
Arduino Library
Python Package
GitHub Hardware Repo

SparkFun SGP40 Air Quality Sensor

Features

Resources

Front & Back View

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