esphome-docs/components/sensor/bh1750.rst
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BH1750 Measurement time doc updates (#515)
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Co-authored-by: Guillermo Ruffino <glm.net@gmail.com>
2020-05-28 23:10:41 -03:00

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BH1750 Ambient Light Sensor
===========================
.. seo::
:description: Instructions for setting up BH1750 ambient light sensors in ESPHome.
:image: bh1750.jpg
:keywords: BH1750
The ``bh1750`` sensor platform allows you to use your BH1750
(`datasheet <http://www.mouser.com/ds/2/348/bh1750fvi-e-186247.pdf>`__, `Adafruit`_, `mklec`_)
ambient light sensor with ESPHome. The :ref:`I²C bus <i2c>` is required to be set up in
your configuration for this sensor to work.
.. figure:: images/bh1750-full.jpg
:align: center
:width: 50.0%
BH1750 Ambient Light Sensor.
.. _Adafruit: https://www.adafruit.com/product/1603
.. _mklec: http://mklec.com/modules/micro-controller-modules/bh1750-bh1750fvi-digital-light-sensor-module
.. figure:: images/bh1750-ui.png
:align: center
:width: 80.0%
.. code-block:: yaml
# Example configuration entry
sensor:
- platform: bh1750
name: "BH1750 Illuminance"
address: 0x23
measurement_time: 69
update_interval: 60s
By default the **measurement_time** is set to ``69`` which will result into measurements up
to 54612.5 lx for this sensor. For low-light situtations consider to choose a higer
measurement_time up to ``254`` which will result in a maximum measurement range up to 14835 lx.
For sunny scenes (for example outdoors with sunlight) use lower values down to ``31`` which will
give you the maximum measurement range up to 121556 lx.
Configuration variables:
------------------------
- **name** (**Required**, string): The name for the sensor.
- **address** (*Optional*, int): Manually specify the i^2c address of the sensor.
Defaults to ``0x23`` (address if address pin is pulled low). If the address pin is pulled high,
the address is ``0x5C``.
- **measurement_time** (*Optional*, int): Manually specifiy the measurement time between ``31``
and ``254``. Defaults to ``69``.
- **resolution** (*Optional*, string): The resolution of the sensor in lx. One of ``4.0``,
``1.0``, ``0.5``. Defaults to ``0.5`` (the maximum resolution).
- **update_interval** (*Optional*, :ref:`config-time`): The interval to check the
sensor. Defaults to ``60s``.
- **id** (*Optional*, :ref:`config-id`): Manually specify the ID used for code
generation.
- All other options from :ref:`Sensor <config-sensor>`.
See Also
--------
- :ref:`sensor-filters`
- :doc:`tsl2561`
- :apiref:`bh7150/bh7150.h`
- `BH1750 Library <https://github.com/claws/BH1750>`__ by `@claws <https://github.com/claws>`__
- :ghedit:`Edit`