2018-08-22 22:05:28 +02:00
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MH-Z19 CO_2 and Temperature Sensor
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==================================
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The ``mhz19`` sensor platform allows you to use MH-Z19 CO_2 and temperature sensors
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(`refspace`_) with esphomelib.
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.. figure:: images/mhz19-full.jpg
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:align: center
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:width: 50.0%
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MH-Z19 CO_2 and Temperature Sensor.
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.. _refspace: https://revspace.nl/MHZ19
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As the communication with the MH-Z19 is done using UART, you need
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to have an :ref:`UART bus <uart>` in your configuration with the ``rx_pin`` connected to the TX pin of the
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MH-Z19 and the ``tx_pin`` connected to the RX Pin of the MH-Z19 (it's switched because the
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TX/RX labels are from the perspective of the MH-Z19). Additionally, you need to set the baud rate to 9600.
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.. code:: yaml
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# Example configuration entry
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uart:
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rx_pin: D0
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tx_pin: D1
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baud_rate: 9600
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2018-08-24 22:44:01 +02:00
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2018-08-22 22:05:28 +02:00
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sensor:
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- platform: mhz19
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co2:
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name: "MH-Z19 CO2 Value"
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temperature:
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name: "MH-Z19 Temperature"
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update_interval: 15s
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Configuration variables:
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------------------------
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- **co2** (**Required**): The CO_2 data from the sensor in parts per million (ppm).
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- **name** (**Required**, string): The name for the CO_2 sensor.
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- **id** (*Optional*, :ref:`config-id`): Set the ID of this sensor for use in lambdas.
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- All other options from :ref:`Sensor <config-sensor>` and :ref:`MQTT Component <config-mqtt-component>`.
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- **temperature** (**Required**): The information for the temperature sensor. Please note that this is
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not officially documented in the datasheet and seems to be quite inaccurate.
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- **name** (**Required**, string): The name for the temperature sensor.
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- **id** (*Optional*, :ref:`config-id`): Set the ID of this sensor for use in lambdas.
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- All other options from :ref:`Sensor <config-sensor>` and :ref:`MQTT Component <config-mqtt-component>`.
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- **update_interval** (*Optional*, :ref:`config-time`): The interval to check the
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sensor. Defaults to ``15s``. See :ref:`sensor-default_filter`.
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- **uart_id** (*Optional*, :ref:`config-id`): Manually specify the ID of the :ref:`UART Component <uart>` if you want
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to use multiple UART buses.
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.. figure:: images/mhz19-pins.jpg
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:align: center
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:width: 80.0%
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Pins on the MH-Z19. Only the ones marked with a red circle need to be connected.
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See Also
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--------
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- :ref:`sensor-filters`
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2018-08-24 22:44:01 +02:00
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- `MH-Z19 library <https://github.com/nara256/mhz19_uart>`__ by `@nara356 <https://github.com/nara256>`__
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2018-08-22 22:05:28 +02:00
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- :doc:`API Reference </api/sensor/mhz19>`
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- `Edit this page on GitHub <https://github.com/OttoWinter/esphomedocs/blob/current/esphomeyaml/components/sensor/mhz19.rst>`__
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