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187 lines
8.6 KiB
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Lite-On Ambient Light & Proximity Sensors
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=========================================
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.. seo::
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:description: Instructions for setting up LTR303, LTR329, LTR553, LTR556, LTR559, LTR659 ambient light sensors/proximity sensors with ESPHome.
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:image: ltr303.jpg
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:keywords: LTR-329, LTR-303, LTR-553, LTR-556, LTR-559, LTR-659
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.. figure:: images/ltr303-full.jpg
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:align: center
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:width: 90.0%
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LTR-329 and LTR-303 Ambient Light Sensors.
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.. figure:: images/ltr303-ui.png
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:align: center
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:width: 60.0%
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LTR-303 Sensor in Home Assistant UI.
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The ``ltr_als_ps`` sensor platform allows you to use a range of LiteOn ambient light and proximity sensors
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with ESPHome. The :ref:`I²C Bus <i2c>` is required to be set up in your configuration for this sensor to work.
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The family of sensors includes:
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- Ambient Light Sensors **LTR-303ALS** and **LTR-329ALS**
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- Integrated Ambient Light and Proximity Sensors **LTR-553ALS**, **LTR-556ALS**, **LTR-559ALS**
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- Proximity Sensor **LTR-659ALS** (with PS gain control)
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The sensors are very similar and share the same datasheet. First two have default I²C address ``0x29`` and the rest
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have default I²C address ``0x23``. The sensors are available on breakout boards from a number of vendors, for
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example `Adafruit`_ or `Pimoroni`_.
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Proximity sensors are the same sort of sensors that you find in phones and tablets to disable the screen when you hold
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the device up to your ear. They might be useful for automated turning on or off of displays and control panels. An
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example is the CoreS3 board from M5Stack that has an LTR-559ALS sensor integrated just under the screen.
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.. _Adafruit: http://www.adafruit.com/products/5610
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.. _Pimoroni: https://shop.pimoroni.com/products/ltr-559-light-proximity-sensor-breakout
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Ambient light sensing
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---------------------
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The sensor platform provides a linear response over a wide dynamic range from 0.01 lux to 64k lux and is well suited
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to applications under high ambient brightness. There are altogether six gain settings (1X, 2X, 4X, 8X, 48X and 96X)
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available for user to configure. Use higher gain for dimmer areas.
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The devices consist of two photodiodes: The *CH0* diode is sensitive to both visible and infrared light and
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the *CH1* diode is sensitive only to infrared light.
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.. figure:: images/ltr303-spectral.png
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:align: center
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:width: 100.0%
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CH0 and CH1 typical spectral response
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Ambient light illuminance calculation
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Excerpt from the datasheet:
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.. code-block::
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RATIO = CH1/(CH0+CH1)
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IF (RATIO < 0.45)
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ALS_LUX = (1.7743 * CH0 + 1.1059 * CH1) / ALS_GAIN / ALS_INT
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ELSEIF (RATIO < 0.64 && RATIO >= 0.45)
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ALS_LUX = (4.2785 * CH0 – 1.9548 * CH1) / ALS_GAIN / ALS_INT
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ELSEIF (RATIO < 0.85 && RATIO >= 0.64)
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ALS_LUX = (0.5926 * CH0 + 0.1185 * CH1) / ALS_GAIN / ALS_INT
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ELSE
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ALS_LUX = 0
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END
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where:
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- ``CH0`` and ``CH1`` are the sensor values (measurement counts) for Visible + IR (Ch0) and IR only (Ch1) sensors respectively.
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- ``ALS_GAIN`` is the gain multiplier
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- ``ALS_INT`` is the integration time in ms/100
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ALS Gain levels
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^^^^^^^^^^^^^^^
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The table lists gain values and corresponding illuminance range:
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========= ================================
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Gain Illuminance range
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========= ================================
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``1X`` 1 lux to 64k lux (default)
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``2X`` 0.5 lux to 32k lux
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``4X`` 0.25 lux to 16k lux
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``8X`` 0.125 lux to 8k lux
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``48X`` 0.02 lux to 1.3k lux
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``96X`` 0.01 lux to 600 lux
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========= ================================
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This Wikipedia `article <https://en.wikipedia.org/wiki/Lux>`__ has a table of some lux values for comparison.
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Proximity sensing
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-----------------
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The proximity sensor has a built-in emitter and detector. The sensor detects reflected IR light from the emitter and
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gives a raw count value inversely exponential to the distance. A decrease in the count value means an object is getting
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further away from the sensor, and vice-versa. Neither of the datasheets provides any information on how to convert
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the raw count value to distance. The only way to do it is to test the sensor yourself and select the threshold
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according to your needs and environment. Exact numbers will depend on the type of the object, its color and
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reflectivity.
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Example configuration
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---------------------
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.. code-block:: yaml
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sensor:
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- platform: ltr_als_ps
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address: 0x23
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update_interval: 60s
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type: ALS_PS # or ALS or PS
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ambient_light: "Ambient light"
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# PS only section
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ps_cooldown: 5 s
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ps_high_threshold: 500
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on_ps_high_threshold:
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then:
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- .... # do something - light up the screen for example
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ps_counts: "Proximity counts"
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Configuration variables:
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------------------------
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- **id** (*Optional*, :ref:`config-id`): Manually specify the ID used for code generation.
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- **address** (*Optional*, int): Manually specify the I²C address of the sensor. Default is ``0x29``.
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- **type** (*Optional*, string): The type of the sensor. Valid values are ``ALS_PS`` *(default)* for
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integrated sensors, ``ALS`` for ambient light only or ``PS`` for proximity only devices.
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- **auto_mode** (*Optional*, boolean): Automatic gain and integration time selection. Defaults to True.
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- **gain** (*Optional*, string): The gain the device will use. Higher values are better in low-light conditions.
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Valid values are ``1X`` *(default)*, ``2X``, ``4X``, ``8X``, ``48X``, ``96X``.
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- **integration_time** (*Optional*, :ref:`config-time`):
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The amount of time sensors are exposed. Longer means more accurate values.
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Valid values are: ``50ms`` *(default)*, ``100ms``, ``150ms``, ``200ms``, ``250ms``, ``300ms``, ``350ms``, ``400ms``.
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- **glass_attenuation_factor** (*Optional*, float): The attenuation factor of glass if it's behind some glass
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or plastic facia. Default is ``1.0`` means ``100%`` transmissivity. ``2`` means ``50%`` transmissivity etc.
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- **update_interval** (*Optional*, :ref:`config-time`): The interval for checking the sensors.
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Defaults to ``60s``.
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- **ps_cooldown** (*Optional*, :ref:`config-time`): The "cooldown" period after the proximity sensor is triggered.
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Helps to avoid multiple calls. Defaults to ``5s``.
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- **ps_gain** (*Optional*, string): The gain the device will use for proximity sensor. Higher values are better in low-light conditions.
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Valid values are ``16X`` *(default)*, ``32X``, ``64X``. Only for **LTR-659ALS**.
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- **ps_high_threshold** (*Optional*, int): The threshold for the proximity sensor to trigger on object getting closer.
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Defaults to ``65535``, which implies it will never be triggered.
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- **ps_low_threshold** (*Optional*, int): The threshold for the proximity sensor to trigger on object getting further away.
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Defaults to ``0``, which implies it will never be triggered.
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- **on_ps_high_threshold** (*Optional*): Actions to perform when the proximity sensor is triggered
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on object getting closer.
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- **on_ps_low_threshold** (*Optional*): Actions to perform when the proximity sensor is triggered
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on object getting further away.
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Sensors
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^^^^^^^
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This component offers five sensors for ALS-equipped devices and one sensor for PS-equipped devices.
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You can configure all or any subset of these sensors. Each configured sensor is reported separately
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on each ``update_interval``. Each is an ESPHome :ref:`sensor <config-sensor>` and may be configured
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accordingly; if you don’t need to configure additional :ref:`sensor <config-sensor>` variables, you
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may simply use the shorthand syntax for the sensor. For example: ``ambient_light: "Ambient light"``
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- **ambient_light** (*Optional*): Illuminance of ambient light, close to human eye spectre, lx.
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- **infrared_counts** (*Optional*): Sensor counts from the IR-sensitive sensor (*CH1*), counts.
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- **full_spectrum_counts** (*Optional*): Sensor counts from the sensor sensitive to both visible light and IR (*CH0*), counts.
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- **actual_gain** (*Optional*): Gain value used to measure data, multiplier. Particularly useful when "auto_mode" is selected.
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- **actual_integration_time** (*Optional*): Integration time used to measure data, ms. Particularly useful when "auto_mode" is selected.
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- **ps_counts** (*Optional*) - Raw 11-bit reading from proximity sensor, counts.
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See Also
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--------
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- `LTR-303ALS datasheet <https://github.com/latonita/datasheets-storage/blob/main/sensors/LTR-303ALS-01_DS_V1.pdf>`__
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- Application note `LTR-303ALS & LTR-329ALS Appendix A <https://github.com/latonita/datasheets-storage/blob/main/sensors/LTR-303%20329_Appendix%20A%20Ver_1.0_22%20Feb%202013.pdf>`__
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- `LTR-559ALS datasheet <https://github.com/latonita/datasheets-storage/blob/main/sensors/ltr-559als-01_ds_v1.pdf>`__
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- :apiref:`ltr_als_ps/ltr_als_ps.h`
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- :ghedit:`Edit`
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