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Update ads1115.rst notes with gentle warning about over voltage measurement which is not entirely clear at first sight / observation of the sensor.
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134 lines
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ADS1115 Sensor
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==============
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.. seo::
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:description: Instructions for setting up ADS1115 multiplexed analog voltage sensors.
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:image: ads1115.jpg
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:keywords: ADS1115
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.. _ads1115-component:
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Component/Hub
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-------------
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The ``ads1115`` domain creates a global hub so that you can later create
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individual sensors using the :ref:`ADS1115 Sensor Platform <ads1115-sensor>`.
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To use this hub, first setup the :ref:`I²C Bus <i2c>` and connect the sensor to the pins specified there.
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.. figure:: images/ads1115-full.jpg
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:align: center
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:width: 50.0%
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ADS1115 16-Bit ADC.
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.. _Adafruit: https://www.adafruit.com/product/1085
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.. code-block:: yaml
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ads1115:
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- address: 0x48
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Configuration variables:
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************************
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- **address** (**Required**, int): The i²c address of the sensor.
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See :ref:`I²C Addresses <ads1115_i2c_addresses>` for more information.
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- **continuous_mode** (*Optional*, boolean): Set if the ADS1115 should continuously measure voltages or
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only measure them when an update is called. Please enable this for the :doc:`ct_clamp` integration.
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Defaults to ``off``.
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- **id** (*Optional*, :ref:`config-id`): Manually specify the ID for this ADS1115 Hub. Use this if you
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want to use multiple ADS1115 hubs at once.
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.. _ads1115_i2c_addresses:
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I²C Addresses
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-------------
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In order to allow multiple sensors to be connected to the same i²c bus,
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the creators of this sensor hardware have included some options to
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change the i²c address.
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- If the address pin is pulled to GND, the address is ``0x48`` (Default).
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- If the address pin is pulled to VCC, the address is ``0x49``.
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- If the address pin is tied to SDA, the address is ``0x4a``.
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- If the address pin is tied to SCL, the address is ``0x4B``.
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.. _ads1115-sensor:
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Sensor
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------
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The ``ads1115`` sensor allows you to use your ADS1115 sigma-delta ADC
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sensors (`datasheet <http://www.ti.com/lit/ds/symlink/ads1115.pdf>`__, `Adafruit`_) with ESPHome.
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First, setup an :ref:`ADS1115 Hub <ads1115-component>` for your ADS1115 sensor and then use this
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sensor platform to create individual sensors that will report the
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voltage to Home Assistant.
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.. _Adafruit: https://www.adafruit.com/product/1085
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.. figure:: images/ads1115-ui.png
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:align: center
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:width: 80.0%
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.. code-block:: yaml
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ads1115:
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- address: 0x48
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sensor:
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- platform: ads1115
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multiplexer: 'A0_GND'
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gain: 6.144
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name: "ADS1115 Channel A0-GND"
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Configuration variables:
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************************
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- **multiplexer** (**Required**): The multiplexer channel of this sensor. Effectively means between which pins you
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want to measure voltage.
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- **gain** (**Required**, float): The gain of this sensor.
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- **name** (**Required**, string): The name for this sensor.
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- **ads1115_id** (*Optional*, :ref:`config-id`): Manually specify the ID of the
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:ref:`ADS1115 Hub <ads1115-component>` you want to use this sensor.
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- **update_interval** (*Optional*, :ref:`config-time`): The interval
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to check the sensor. Defaults to ``60s``.
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- **id** (*Optional*, :ref:`config-id`): Manually specify the ID used for code generation.
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Multiplexer and Gain
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--------------------
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.. note::
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As per (`datasheet <http://www.ti.com/lit/ds/symlink/ads1115.pdf>`__, `Adafruit`_) Section 7.3 Note 2:
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"No more than VDD + 0.3V must be applied to the analog inputs of the device."
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This means if you power the device with 3.3V, take care not to supply the 4 AIN pins with more than 3.6V.
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The ADS1115 has a multiplexer that can be configured to measure voltage between several pin configurations. These are:
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- ``A0_A1`` (between Pin 0 and Pin 1)
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- ``A0_A3`` (between Pin 0 and Pin 3)
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- ``A1_A3`` (between Pin 1 and Pin 3)
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- ``A2_A3`` (between Pin 2 and Pin 3)
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- ``A0_GND`` (between Pin 0 and GND)
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- ``A1_GND`` (between Pin 1 and GND)
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- ``A2_GND`` (between Pin 2 and GND)
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- ``A3_GND`` (between Pin 3 and GND)
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Additionally, the ADS1115 has a Programmable Gain Amplifier (PGA) that can help you measure voltages in different ranges, these are:
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- ``6.144`` (measures up to 6.144V)
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- ``4.096`` (measures up to 4.096V)
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- ``2.048`` (measures up to 2.048V)
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- ``1.024`` (measures up to 1.024V)
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- ``0.512`` (measures up to 0.512V)
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- ``0.256`` (measures up to 0.256V)
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See Also
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--------
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- :ref:`sensor-filters`
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- :doc:`adc`
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- :doc:`max6675`
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- :apiref:`ads1115/ads1115.h`
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- `i2cdevlib <https://github.com/jrowberg/i2cdevlib>`__ by `Jeff Rowberg <https://github.com/jrowberg>`__
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- :ghedit:`Edit`
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