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114 lines
3.9 KiB
ReStructuredText
114 lines
3.9 KiB
ReStructuredText
CCS811 eCO_2 and Volatile Organic Compound Sensor
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=================================================
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.. seo::
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:description: Instructions for setting up CCS811 sensors.
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:image: ccs811.jpg
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The ``ccs811`` sensor platform allows you to use CCS811 eCO_2 and volatile organic compound sensors
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(`Adafruit`_) with ESPHome.
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.. note::
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Most CCS811 modules require the WAK pin to be pulled low to wake up the sensor, as outlined in the data sheets.
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Outside low-power scenarios, connecting WAK to ground is the recommended configuration. For low power installations,
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pulling WAK low should happen in software prior to taking the measures.
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.. figure:: images/ccs811-full.jpg
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:align: center
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:width: 50.0%
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CCS811 Sensor. Image by `Adafruit`_
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.. _Adafruit: https://www.adafruit.com/product/3566
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The communication with this sensor is done via :ref:`I²C Bus <i2c>`, so you need to have
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an ``i2c:`` section in your config for this component to work.
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.. code-block:: yaml
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# Example configuration entry
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i2c:
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sda: D0
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scl: D1
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sensor:
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- platform: ccs811
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eco2:
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name: "CCS811 eCO2 Value"
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tvoc:
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name: "CCS811 Total Volatile Organic Compound"
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address: 0x5A
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update_interval: 60s
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Configuration variables:
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------------------------
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- **eco2** (**Required**): The eCO_2 data from the sensor in parts per million (ppm).
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- All options from :ref:`Sensor <config-sensor>`.
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- **tvoc** (**Required**): The information for the total volatile organic compound sensor in
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parts per billion (ppb).
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- All options from :ref:`Sensor <config-sensor>`.
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- **update_interval** (*Optional*, :ref:`config-time`): The interval to check the
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sensor. Defaults to ``60s``.
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- **version** (*Optional*): This sensor reports the firmware ('application') version in text, with the internal hex representation of the version number behind it, so version 1.0.0 will be reported as '1.0.0 (0x1000)'.
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- All options from :ref:`Text Sensor <config-text_sensor>`.
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Advanced:
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- **address** (*Optional*, int): The :ref:`I²C <i2c>` address of the sensor.
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- **baseline** (*Optional*, int): The baseline value for the unit, for calibration
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purposes. See :ref:`ccs811-calibrating` for more info.
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- **temperature** (*Optional*, :ref:`config-id`): Give an external temperature sensor ID
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here. This can improve the sensor's internal calculations.
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- **humidity** (*Optional*, :ref:`config-id`): Give an external humidity sensor ID
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here. This can improve the sensor's internal calculations.
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.. _ccs811-calibrating:
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Calibrating Baseline
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--------------------
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The CCS811 sensor will re-calibrate itself each time it is powered on. Unfortunately
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that also means that if the sensor reboots at a time when the air is less clean than normal,
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the values will have a constant offset and cannot be compared to the values before the last
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boot.
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To have consistent values, you need to specify a static **baseline** value (the calibration factor).
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To do this, first let the sensor boot up with no baseline set and let the sensor calibrate
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itself. After around 20-30 minutes you can then view the remote logs on the ESP. The next
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time the sensor is read out, you will see a log message with something like ``baseline=0xA483``.
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Now set the baseline property in your configuration file like so with the value you got
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via the logs:
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.. code-block:: yaml
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# Example configuration entry
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sensor:
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- platform: ccs811
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# ...
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baseline: 0xA483
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The next time you upload the code, the CCS811 will be informed of this static baseline
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and you will get consistent values.
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Please note that after some time (a couple of months), the baseline will need to be
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re-calibrated because the internal sensor has a slight value drift over time.
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See Also
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--------
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- :ref:`sensor-filters`
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- `CCS811 Application Note <https://cdn.sparkfun.com/datasheets/BreakoutBoards/CCS811_Programming_Guide.pdf>`__
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- :apiref:`ccs811/ccs811.h`
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- :ghedit:`Edit`
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