Add Raspberry Pi RF docs

source/_components/switch.rpi_rf.markdown

@@ -0,0 +1,43 @@
+---
+layout: page
+title: "Raspberry PI GPIO Switch"
+description: "Instructions how to integrate the GPIO of a Raspberry PI into Home Assistant as a switch."
+date: 2016-05-07 09:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: raspberry-pi.png
+ha_category: Switch
+ha_release: 0.19
+---
+
+
+The `rpi_rf` switch platform allows you to control devices over 433/315MHz LPD/SRD signals with generic low-cost GPIO RF modules on a [Raspberry Pi](https://www.raspberrypi.org/).
+
+To use your Raspberry Pi with a 433MHz adaptor in your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+switch:
+  platform: rpi_rf
+  gpio: 17
+  switches:
+    bedroom_light:
+      code_on: 1234567
+      code_off: 1234568
+    ambilight:
+      pulselength: 200
+      code_on: 987654
+      code_off: 133742
+```
+
+Configuration variables:
+
+- **gpio** array (*Required*): Array of used ports.
+- **switches:** (*Required*): Array of switches.
+  - **[name]** (*Requireld*): If true, inverts the output logic to ACTIVE LOW. Default is false (ACTIVE HIGH).
+    - **code_on** (*Requireld*): Code to switch the device on, eg. `987654`.
+    - **code_off** (*Requireld*):  Code to switch the device off, eg. `133742`.
+    - **pulselength** (*Optional*):  Length of the pulse
+