esphome-docs/components/sensor/ads1118.rst
Jesse Hills 88e315e0e4
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---------

Co-authored-by: Keith Burzinski <kbx81x@gmail.com>
2024-05-07 00:40:12 -05:00

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ADS1118 4-Channel 16-Bit A/D Converter with Internal Temperature Sensor
=======================================================================
.. seo::
:description: Instructions for setting up ADS1118 multiplexed analog voltage sensors.
:image: ads1118.jpg
:keywords: ADS1118
.. _ads1118-component:
Component/Hub
-------------
ADS1118 4-Channel 16-Bit A/D Converter (`datasheet <https://www.ti.com/lit/ds/symlink/ads1118.pdf>`__)
The ``ads1118`` domain creates a global hub so that you can later create
individual sensors using the :ref:`ADS1118 Sensor Platform <ads1118-sensor>`.
It uses the :ref:`SPI Bus <spi>` for communication.
.. figure:: images/ads1118-full.jpg
:align: center
:width: 60.0%
ADS1118 16-Bit ADC.
.. code-block:: yaml
ads1118:
cs_pin: GPIOXX
Configuration variables:
************************
- **cs_pin** (**Required**, int): The SPI cable select pin to use.
- **id** (*Optional*, :ref:`config-id`): Manually specify the ID for this ADS1118 Hub. Use this if you
want to use multiple ADS1118 hubs at once.
.. _ads1118-sensor:
Sensor
------
The ``ads1118`` sensor allows you to use your ADS1118 delta-sigma ADC
sensors (`datasheet <https://www.ti.com/lit/ds/symlink/ads1118.pdf>`__) with ESPHome.
First, setup an :ref:`ADS1118 Hub <ads1118-component>` for your ADS1118 sensor and then use this
sensor platform to create individual sensors that will report the voltage.
.. code-block:: yaml
sensor:
- platform: ads1118
type: adc
id: batt_volt
name: Battery Voltage
multiplexer: A3_GND
gain: 4.096
update_interval: .01s
Configuration variables:
************************
- **type** (*Optional*): ``adc``(default) or ``temperature``
- **ads1118_id** (*Optional*, :ref:`config-id`): Manually specify the ID of the
:ref:`ADS1118 Hub <ads1118-component>` you want to use this sensor.
- **update_interval** (*Optional*, :ref:`config-time`): The interval to check the sensor. Defaults to ``60s``.
- All other options from :ref:`Sensor <config-sensor>`.
ADC Options:
^^^^^^^^^^^^
- **multiplexer** (**Required**): The multiplexer channel of this sensor. Effectively means between which pins you want to measure voltage.
- **gain** (**Required**, float): The gain of this sensor.
Temperature Options:
^^^^^^^^^^^^^^^^^^^^
None
Multiplexer and Gain
--------------------
.. note::
As per (`datasheet <https://www.ti.com/lit/ds/symlink/ads1118.pdf>`__) Section 7.3 Note 2:
"No more than VDD + 0.3V must be applied to the analog inputs of the device."
This means if you power the device with 3.3V, take care not to supply the 4 AIN pins with more than 3.6V.
The ADS1118 has a multiplexer that can be configured to measure voltage between several pin configurations. These are:
- ``A0_A1`` (between Pin 0 and Pin 1)
- ``A0_A3`` (between Pin 0 and Pin 3)
- ``A1_A3`` (between Pin 1 and Pin 3)
- ``A2_A3`` (between Pin 2 and Pin 3)
- ``A0_GND`` (between Pin 0 and GND)
- ``A1_GND`` (between Pin 1 and GND)
- ``A2_GND`` (between Pin 2 and GND)
- ``A3_GND`` (between Pin 3 and GND)
Additionally, the ADS1118 has a Programmable Gain Amplifier (PGA) that can help you measure voltages in different ranges, these are:
- ``6.144`` (measures up to 6.144V)
- ``4.096`` (measures up to 4.096V)
- ``2.048`` (measures up to 2.048V)
- ``1.024`` (measures up to 1.024V)
- ``0.512`` (measures up to 0.512V)
- ``0.256`` (measures up to 0.256V)
See Also
--------
- :ref:`sensor-filters`
- :doc:`adc`
- :doc:`ads1115`
- :apiref:`ads1118/ads1118.h`
- :ghedit:`Edit`