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Add MCP47A1 docs (#1780)

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MCP47A1 Output
==============
.. seo::
:description: Instructions for setting up MCP47A1 outputs on the ESP.
:image: mcp47a1.svg
The ``mcp47a1`` output component allows to use `6bit external DAC <https://www.microchip.com/en-us/product/MCP47A1>`__
in order to have analog output(s) on any board by using I²C. Devices default address is ``0x2E``
and configurable alternative is ``0x3E``.
.. code-block:: yaml
# Example configuration entry
# Set a global I²C connection
i2c:
sda: 21
scl: 22
scan: true
# Set the output with default (address: 0x2E / global I²C)
output:
- platform: mcp47a1
id: dac_output
on_...:
then:
- output.set_level:
id: dac_output
level: 100%
Configuration variables:
------------------------
- **id** (**Required**, :ref:`config-id`): The id to use for this output component.
- **address** (*Optional*, int): Manually specify the I²C address of
the DAC. Defaults to ``0x2E``.
- All other options from :ref:`Output <config-output>`.
See Also
--------
- :doc:`/components/output/mcp4725`
- :doc:`/components/output/esp32_dac`
- :doc:`/components/output/esp8266_pwm`
- :ghedit:`Edit`

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3
index.rst
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@ -271,7 +271,7 @@ Environmental
BME680 via BSEC, components/sensor/bme680_bsec, bme680.jpg, Temperature & Humidity & Pressure & Gas
BMP085, components/sensor/bmp085, bmp180.jpg, Temperature & Pressure
BMP280, components/sensor/bmp280, bmp280.jpg, Temperature & Pressure
BMP388 and BMP390, components/sensor/bmp3xx, bmp388.jpg, Temperature & Pressure
BMP388 and BMP390, components/sensor/bmp3xx, bmp388.jpg, Temperature & Pressure
b-parasite, components/sensor/b_parasite, b_parasite.jpg, Moisture & Temperature & Humidity & Light
Dallas DS18B20, components/sensor/dallas, dallas.jpg, Temperature
DHT, components/sensor/dht, dht.jpg, Temperature & Humidity
@ -409,6 +409,7 @@ Output Components
SM16716, components/output/sm16716, sm16716.svg
SM2135, components/output/sm2135, sm2135.svg
MCP4725, components/output/mcp4725, mcp4725.jpg
MCP47A1, components/output/mcp47a1, mcp47a1.svg
BLE Binary Output, components/output/ble_client, bluetooth.svg
Modbus Output, components/output/modbus_controller, modbus.png
Custom Output, components/output/custom, language-cpp.svg