Add docs from adc128s102 sensor (#2308)

Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>

components/sensor/adc128s102.rst

@@ -0,0 +1,66 @@
+ADC128S102 8-Channel 12-Bit A/D Converter
+==========================================
+
+.. seo::
+    :description: Instructions for setting up ADC128S102 12 Bit Analog to Digital Converter in ESPHome.
+    :keywords: ADC128S102
+    :image: adc128s102.png
+
+The ADC128S102 is a low-power, eight-channel CMOS 12-bit analog-to-digital converter specified for conversion 
+throughput rates of 500 ksps to 1 MSPS. The converter is based on a successive-approximation register architecture 
+with an internal track-and-hold circuit.
+
+.. figure:: images/adc128s102.png
+    :align: center
+    :width: 50.0%
+
+.. _adc128s102-component:
+
+Component/Hub
+-------------
+
+The ADC128S102 component allows you to use ADC128S102 8-Channel 12-Bit A/D Converter
+(`datasheet <https://www.ti.com/lit/ds/symlink/adc128s102.pdf>`__,
+`Texas Instruments <https://www.ti.com/product/ADC128S102>`__) in ESPHome.
+It uses the :ref:`SPI Bus <spi>` for communication.
+
+Once configured, you can use any of the 8 pins as
+sensors for your projects.
+
+.. code-block:: yaml
+
+    # Example configuration entry
+    adc128s102:
+      cs_pin: GPIO15
+      id: my_adc
+
+    sensor:
+      - platform: adc128s102           # Attached to pin 0 of the ADC128S102.
+        update_interval: 1s
+        adc128s102_id: my_adc
+        id: freezer_temp_source
+        channel: 0                     # ADC128S102 channel
+
+Configuration variables:
+- **id** (**Required**, :ref:`config-id`): The id to use for this ADC128S102 component.
+- **cs_pin** (**Required**, int): The SPI cable select pin to use
+
+Sensor
+------
+
+The ``adc128s102`` sensor allows you to use your ADC128S102 12-Bit A/D Converter sensors with ESPHome.
+First, setup a :ref:`ADC128S102 Hub <adc128s102-component>` for your ADC128S102 sensor and then use this
+sensor platform to create individual sensors that will report the voltage to Home Assistant.
+
+Configuration variables:
+
+- **adc128s102_id** (**Required**, :ref:`config-id`): The id of the parent ADC128S102 component.
+- **channel** (**Required**, int): The channel of the ADC128S102 to use.
+- **update_interval** (*Optional*, :ref:`config-time`): The interval to check the sensor. Defaults to ``60s``.
+
+See Also
+--------
+
+- :ref:`spi`
+- :apiref:`adc128s102/adc128s102.h`
+- :ghedit:`Edit`

index.rst

@@ -207,6 +207,7 @@ Analogue
 .. imgtable::
 
     ADC, components/sensor/adc, flash.svg, ESP internal
+    ADC128S102, components/sensor/adc128s102, adc128s102.png , 8-channel ADC
     ADS1115, components/sensor/ads1115, ads1115.jpg, 4-channel ADC
     CD74HC4067, components/sensor/cd74hc4067, cd74hc4067.jpg, 16-channel analog multiplexer
     MCP3008, components/sensor/mcp3008, mcp3008.jpg, 8-channel ADC