Merge branch 'binary-sensor'

source/_components/binary_sensor.arest.markdown

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+---
+layout: component
+title: "aREST binary sensor"
+description: "Instructions how to integrate aREST binary sensors within Home Assistant."
+date: 2015-11-20 18:15
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: arest.png
+ha_category: Binary Sensor
+---
+
+
+The arest binary sensor platform allows you to get all data from your devices (like Arduinos with a ethernet/wifi connection, the ESP8266, and the Raspberry Pi) running the [aREST](http://arest.io/) RESTful framework.
+
+To use your aREST binary sensor in your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  platform: arest
+  resource: http://IP_ADDRESS
+  name: Office Switch
+  pin: 8
+```
+
+Configuration variables:
+
+- **resource** (*Required*): IP address and schema of the device that is exposing an aREST API, e.g. http://192.168.1.10.
+- **name** (*Optional*): Let you overwrite the the name of the device. By default *name* from the device is used.
+- **pin** (*Required*): Number of the pin to monitor.
+
+Accessing the URL http://IP_ADDRESS/digital/PIN_NUMBER should give you the state of the pin inside a JSON response as `return_value`.
+
+```bash
+$ curl -X GET http://10.100.0.157/digital/9
+{"return_value": 0, "id": "office1", "name": "Office", "connected": true}
+
+```
+
+<p class='note'>
+This sensor is not suitable for fast state changes because there is a high possibility that the change took place between two update cycle. 
+</p>

source/_components/binary_sensor.markdown

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+---
+layout: component
+title: "Binary Sensor"
+description: "Instructions how to setup your binary sensors with Home Assistant."
+date: 2015-11-20 14:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+---
+
+Binary sensors are gathering information about state of switches, contacts, pins, and alike. The return value of those sensors is usually digital (1/0). This means that those sensors knows only two states: **off/low/open*** and ***on/high/closed**.
+
+For analog sensors please check the [component overview](https://home-assistant.io/components/#sensor).
+

source/_components/binary_sensor.mqtt.markdown

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+---
+layout: component
+title: "MQTT binary sensor"
+description: "Instructions how to integrate MQTT binary sensors within Home Assistant."
+date: 2015-05-30 23:21
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: mqtt.png
+ha_category: Binary Sensor
+---
+
+
+This MQTT binary sensor implementation uses the MQTT message payload as the sensor value. If messages in this state_topic are published with *RETAIN* flag, the sensor will receive an instant update with the last known value. Otherwise, the initial state will be off.
+
+To use your MQTT binary sensor in your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yml entry
+binary_sensor:
+  platform: mqtt
+  state_topic: "home-assistant/window/contact"
+  name: "MQTT Sensor"
+  qos: 0
+  payload_on: "ON"
+  payload_of: "OFF"
+```
+
+Configuration variables:
+
+- **state_topic** (*Required*): The MQTT topic subscribed to receive sensor values.
+- **name** (*Optional*): The name of the sensor. Default is 'MQTT Sensor'. 
+- **qos** (*Optional*): The maximum QoS level of the state topic. Default is 0.
+- **payload_on** (*Optional*): The payload that represents on state. Default is "ON".
+- **payload_off** (*Optional*): The payload that represents  state. Default is "OFF".
+
+
+For a quick check you can use the commandline tools shipped with `mosquitto` to send MQTT messages. Set the state of your sensor manually:
+
+```bash
+$  mosquitto_pub -h 127.0.0.1 -t home-assistant/window/contact -m "OFF"
+```
+