esphome-docs/esphomeyaml/components/sensor/mhz19.rst

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