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Revise SM300D2 documentation

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Adds information about the LCD modules which are often sold with/for these sensors, and using them in conjunction with an ESP.  Also notes that INPUT_PULLDOWN mode may help with reliability, and aligns some of the config descriptions with other air quality sensors.
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Paul Nicholls 2022-10-27 20:27:10 +13:00
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components/sensor/sm300d2.rst
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@ -19,16 +19,24 @@ The ``sm300d2`` sensor platform allows you to use the SM300D2 7-in-1 Air Quality
:width: 50.0%
The SM300D2 sensor supports connections via UART or RS485. This platform only supports UART-connections.
Although the SM300D2 sensor supports connections via UART or RS485, this platform only supports UART
connections. The LCD module which is often sold with/for these sensor boards can work over either UART
or RS485, so you can use the LCD over RS485 and an ESP over UART at the same time (see
:ref:`note below <pins-note>` regarding powering everything).
Make sure you have a :ref:`UART bus <uart>` in your configuration with the ``rx_pin`` connected to the
TX pin of the sensor. The sensor does not support receiving data, so the ``tx_pin`` does not need to be
connected. The sensor expects the baud rate to be set at 9600.
sensor's TX pin. The sensor does not support receiving data, so the ``tx_pin`` does not need to be
connected. The UART bus should be set to a baud rate of 9600 to match the sensor's output. Setting the
``rx_pin``'s mode to ``INPUT_PULLDOWN`` may help improve reliability if you're regularly getting missed
or bad/incomplete readings.
.. code-block:: yaml
# Example configuration entry
uart:
rx_pin: D0
rx_pin:
number: D0
mode: INPUT_PULLDOWN
tx_pin: D1
baud_rate: 9600
@ -54,43 +62,43 @@ Configuration variables:
------------------------
- **co2** (**Required**): The CO₂ data from the sensor in parts per million (ppm).
- **co2** (**Required**): The information for the CO₂ sensor. Readings in parts per million (ppm).
- **name** (**Required**, string): The name of the CO₂ sensor.
- **id** (*Optional*, :ref:`config-id`): Set the ID of this sensor for use in lambdas.
- All other options from :ref:`Sensor <config-sensor>`.
- **formaldehyde** (**Required**): The formaldehyde data of the sensor in micrograms per cubic meter air (µg/m³).
- **formaldehyde** (**Required**): The information for the formaldehyde sensor. Readings in µg/m³.
- **name** (**Required**, string): The name of the formaldehyde sensor.
- **id** (*Optional*, :ref:`config-id`): Set the ID of this sensor for use in lambdas.
- All other options from :ref:`Sensor <config-sensor>`.
- **tvoc** (**Required**): The total volatile organic compounds (TVOC) data of the sensor in micrograms per cubic meter air (µg/m³).
- **tvoc** (**Required**): The information for the total volatile organic compounds (TVOC) sensor. Readings in µg/m³.
- **name** (**Required**, string): The name of the TVOC sensor.
- **id** (*Optional*, :ref:`config-id`): Set the ID of this sensor for use in lambdas.
- All other options from :ref:`Sensor <config-sensor>`.
- **pm_2_5** (**Required**): The PM2.5 data of the sensor in micrograms per cubic meter air (µg/m³).
- **pm_2_5** (**Required**): The information for the **Weight Concentration** sensor for fine particles up to 2.5μm. Readings in µg/m³.
- **name** (**Required**, string): The name of the PM2.5 sensor.
- **id** (*Optional*, :ref:`config-id`): Set the ID of this sensor for use in lambdas.
- All other options from :ref:`Sensor <config-sensor>`.
- **pm_10_0** (**Required**): The PM10 data of the sensor in micrograms per cubic meter air (µg/m³).
- **pm_10_0** (**Required**): The information for the **Weight Concentration** sensor for coarse particles up to 10μm. Readings in µg/m³.
- **name** (**Required**, string): The name of the PM10 sensor.
- **id** (*Optional*, :ref:`config-id`): Set the ID of this sensor for use in lambdas.
- All other options from :ref:`Sensor <config-sensor>`.
- **temperature** (**Required**): The temperature data of the sensor in degrees celsius (°C).
- **temperature** (**Required**): The information for the temperature sensor. Readings in degrees celsius (°C).
- **name** (**Required**, string): The name of 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>`.
- **humidity** (**Required**): The humidity data of the sensor in percent relative humidity (%).
- **humidity** (**Required**): The information for the relative humidity sensor. Readings in %.
- **name** (**Required**, string): The name of the humidity sensor.
- **id** (*Optional*, :ref:`config-id`): Set the ID of this sensor for use in lambdas.
@ -110,9 +118,17 @@ Configuration variables:
Pins on the SM300D2. UART RX is not in use.
.. _pins-note:
.. note::
``5V`` should be connected to power supply (supported voltage is 4.8 V to 5.2 V), ``GD`` to ``GND`` pin
The board's ``GD`` pin must be connected to a ``GND`` pin on the ESP.
The sensor board requires between 4.8 and 5.2 volts via the ``5V`` pin in either the UART or RS485 socket, as they
are connected. If you're using a USB-powered ESP module with a 5V input pin (i.e. ``VIN``) exposed, you can choose
to connect the UART ``5V`` pin to the ESP's ``VIN`` and then power everything through either the LCD module or the
ESP module, with a single power cable. If you choose to power the ESP separately from the sensor board, leave the
UART ``5V`` pin unconnected.
See Also