Updated MCP23017 Component To Cover 8 & 16 Port Chips (#277)

* Updated MCP23017 Component To Cover 8 & 16 Port Chips

* Made requested changes, adding short paragraph at top of MCP230xx.rst
explaining the page is for MCP23008 and MCP23017, also deleted now
obsolete MCP23017.rst

* Added separate sections for MCP23017, MCP23008

* Remove MCP23017 page (merged with new one)


Co-authored-by: Otto Winter <otto@otto-winter.com>

components/mcp230xx.rst

@@ -1,9 +1,16 @@
-MCP23017 I/O Expander
+MCP230xx I/O Expander
 =====================
 
 .. seo::
-    :description: Instructions for setting up MCP23017 digital port expanders in ESPHome.
-    :image: mcp23017.png
+    :description: Instructions for setting up MCP23017 or MCP23008 digital port expanders in ESPHome.
+    :image: mcp230xx.png
+
+The Microchip MCP230xx series of general purpose, parallel I/O expansion for I²C
+bus applications come in two different variants: the 8-bit MCP23008 and the 16-bit
+MCP23017, which provide 8 and 16 additional GPIO pins, respectively.
+
+MCP23017
+--------
 
 The MCP23017 component allows you to use MCP23017 I/O expanders
 (`datasheet <http://ww1.microchip.com/downloads/en/devicedoc/20001952c.pdf>`__,
@@ -41,6 +48,43 @@ Configuration variables:
 - **address** (*Optional*, int): The I²C address of the driver.
   Defaults to ``0x21``.
 
+
+
+MCP23008
+--------
+
+The configuration is essentially the same with the MCP23008 component
+(`datasheet <http://ww1.microchip.com/downloads/en/devicedoc/21919e.pdf>`__,
+`Adafruit <https://www.adafruit.com/product/593>`__):
+
+.. code-block:: yaml
+
+    # Example configuration entry
+    mcp23008:
+      - id: 'mcp23008_hub'
+        address: 0x20
+
+    # Individual outputs
+    switch:
+      - platform: gpio
+        name: "MCP23008 Pin #0"
+        pin:
+          mcp23008: mcp23008_hub
+          # Use pin number 0
+          number: 0
+          # One of INPUT, INPUT_PULLUP or OUTPUT
+          mode: INPUT_PULLUP
+          inverted: False
+
+
+Configuration variables:
+~~~~~~~~~~~~~~~~~~~~~~~~
+
+- **id** (**Required**, :ref:`config-id`): The id to use for this MCP23008 component.
+- **address** (*Optional*, int): The I²C address of the driver.
+  Defaults to ``0x21``.
+
+
 See Also
 --------
 
@@ -49,3 +93,4 @@ See Also
 - :doc:`binary_sensor/gpio`
 - :apiref:`mcp23017/mcp23017.h`
 - :ghedit:`Edit`
+

images/mcp230xx.svg

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+</svg>

index.rst

@@ -302,7 +302,7 @@ Misc Components
     Servo, components/servo, servo.svg
 
     PCF8574 I/O Expander, components/pcf8574, pcf8574.jpg
-    MCP23017 I/O Expander, components/mcp23017, mcp23017.svg
+    MCP230XX I/O Expander, components/mcp230xx, mcp230xx.svg
     SIM800L, components/sim800l, sim800l.jpg
 
     Captive Portal, components/captive_portal, wifi-strength-alert-outline.svg