Adafruit SGP30 Air Quality Sensor Breakout - VOC and eCO2

The SGP30 has a "standard" hot-plate MOX sensor and a small microcontroller that controls power to the plate reads the analog voltage, tracks the baseline calibration, calculates TVOC and eCO₂ values, and provides an I²C interface to read from. Unlike the CCS811, this sensor does not require I²C clock stretching. This part will measure eCO2 (equivalent calculated carbon dioxide) concentration within a range of 0 to 60,000 parts per million (ppm), and TVOC (Total Volatile Organic Compound) concentration within a range of 0 to 60,000 parts per billion (ppb).

This sensor has variability and to get precise measurements needs to be calibrated against known sources. For general environmental sensors, it will give a good idea of trends and comparison. The SGP30 does have built in calibration capabilities, note that eCO2 is calculated based on H2 concentration, it is not a 'true' CO₂ sensor for laboratory use. Another nice element to this sensor is the ability to set humidity compensation for better accuracy. An external humidity sensor is required and then the RH% is written over I²C to the sensor, so it can better calculate the TVOC/eCO2 values. The sensor is pick-and-placed on a PCB with a 1.8V regulator and some level shifting so it can be easily used with a 3.3V or 5V microcontroller.