MH-Z19 CO_2 and Temperature Sensor ================================== .. seo:: :description: Instructions for setting up MH-Z19 CO2 and temperature sensors :image: mhz19.jpg :keywords: mh-z19 The ``mhz19`` sensor platform allows you to use MH-Z19 CO_2 and temperature sensors (`refspace`_) with ESPHome. .. 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 ` 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-block:: yaml # Example configuration entry uart: rx_pin: D0 tx_pin: D1 baud_rate: 9600 sensor: - platform: mhz19 co2: name: "MH-Z19 CO2 Value" temperature: name: "MH-Z19 Temperature" update_interval: 60s 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 `. - **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 `. - **update_interval** (*Optional*, :ref:`config-time`): The interval to check the sensor. Defaults to ``60s``. - **uart_id** (*Optional*, :ref:`config-id`): Manually specify the ID of the :ref:`UART Component ` 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` - `MH-Z19 library `__ by `@nara356 `__ - :apiref:`mhz19/mhz19.h` - :ghedit:`Edit`