SGP30 CO₂ and Volatile Organic Compound Sensor

The sgp30 sensor platform allows you to use your Sensiron SGP30 multi-pixel gas (datasheet) sensors or the SVM30 breakout-boards (product page) with ESPHome. The I²C Bus is required to be set up in your configuration for this sensor to work.

../../_images/eco2-tvoc.png
# Example configuration entry
sensor:
  - platform: sgp30
    eco2:
      name: "Workshop eCO2"
      accuracy_decimals: 1
    tvoc:
      name: "Workshop TVOC"
      accuracy_decimals: 1
    address: 0x58
    update_interval: 5s

Configuration variables:

  • eco2 (Required): The information for the CO₂eq. sensor.
    • name (Required, string): The name for the CO₂eq sensor.
    • id (Optional, ID): Set the ID of this sensor for use in lambdas.
    • All other options from Sensor.
  • tvoc (Required): The information for the total Volatile Organic Compounds sensor.
    • name (Required, string): The name for the humidity sensor.
    • id (Optional, ID): Set the ID of this sensor for use in lambdas.
    • All other options from Sensor.
  • address (Optional, int): Manually specify the i^2c address of the sensor. Defaults to 0x58.
  • update_interval (Optional, Time): The interval to check the sensor. Defaults to 60s.

Advanced:

  • baseline (Optional, int): The baseline value for the unit, for calibration purposes. See Calibrating Baseline for more info.
  • compensation (Optional): The block containing sensors used for compensation.
    • temperature_source (Optional, ID): Give an external temperature sensor ID here. This can improve the sensor’s internal calculations.
    • humidity_source (Optional, ID): Give an external humidity sensor ID here. This can improve the sensor’s internal calculations.

Calibrating Baseline

The SGP30 sensor will re-calibrate its baseline each time it is powered on. During the first power-up this can take upto 12 hours.

For best performance and faster startup times, the current baseline needs to be persistently stored on the device before shutting it down and set again accordingly after boot up that also means that if the sensor reboots at a time when the air is less clean than normal, the values will have a constant offset and cannot be compared to the values before the last boot.

To do this, let the sensor boot up with no baseline set and let the sensor calibrate itself. After around 12 hours you can then view the remote logs on the ESP. The next time the sensor is read out, you will see a log message with something like Current eCO2 & TVOC baseline: 0x44D4.

Now set the baseline property in your configuration file like so with the value you got via the logs:

# Example configuration entry
sensor:
  - platform: sgp30
    # ...
    baseline: 0x44D4

The next time you upload the code, the SGP30 will be continue its operation with this baseline and you will get consistent values.

Please note that Sensirion recommends that after around 7 days, the baseline will need to be re-calibrated because the internal sensor has a slight value drift over time.