SGP30 Breakout Board
Adafruit's SGP30 breakout board is an air quality TVOC/CO2e gas sensor
Adafruit's SGP30 multi-pixel gas sensor breakout board offers a fully integrated MOX gas sensor, which is a very fine air quality sensor from Sensirion with I2C interfacing and fully calibrated output signals with typical accuracy of 15% within measured values. The SGP combines multiple metal-oxide sensing elements on one chip to provide more detailed air quality signals. The sensor can detect a wide range of volatile organic compounds (VOCs) and H2 and is intended for indoor air quality monitoring. When connected to a microcontroller (running Adafruit_SGP30 library code) it will return a total volatile organic compound (TVOC) reading and an equivalent carbon dioxide reading (CO2e) over I2C.
The SGP30 has a standard hot-plate MOX sensor, as well as a small microcontroller that controls power to the plate, reads the analog voltage, tracks the baseline calibration, calculates TVOC and CO2e values, and provides an I2C interface to read from. Unlike the CCS811, this sensor does not require I2C clock stretching.
This sensor, like all VOC/gas sensors, has variability and to get precise measurements users will want to calibrate it against known sources. For general environmental sensors, it gives the user a good idea of trends and comparison. The SGP30 does have built-in calibration capabilities though CO2e is calculated based on H2 concentration; it is not an accurate CO2 sensor for laboratory use.