Add arduino sensor page

source/components/sensor.arduino.markdown

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+---
+layout: page
+title: "Arduino sensor support"
+description: "Instructions how to integrate Arduino boards within Home Assistant."
+date: 2015-09-14 18:28
+sidebar: false
+comments: false
+sharing: true
+footer: true
+---
+
+<img src='/images/supported_brands/arduino.png' class='brand pull-right' />
+The arduino sensor platform allows allow you to get an numerical values from an analog input pin of an [Arduino](https://www.arduino.cc/) board. Usually the value is between 0 and 1024. 
+
+To enable an Arduino sensor with Home Assistant, add the following section to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  platform: arduino
+  pins:
+    1:
+      name: Door switch
+      type: analog
+    0:
+      name: Brightness
+      type: analog
+```
+
+Configuration variables:
+
+- **pins** (*Required*): Array of pins to use. The number corresponds with the pin numbering schema of your board.
+  - **name**: Name that will be used in the frontend for the pin.
+  - **type**: The type of the pin. At the moment only 'analog' is supported.
+
+The 6 analog pins of an Arduino UNO are numbered from A0 to A5.
+