Update to components/sensor.sensehat (#2009)

* Update to components/sensor.sensehat

• Have provided more information on how to install the SenseHAT for Virtual Environment installs
• Have included directions on making the SenseHAT prettier

* Amends to comform with PR

source/_components/sensor.sensehat.markdown

@@ -36,3 +36,116 @@ Configuration variables:
   - 'pressure'
 
 
+#### Customizing the Sense HAT data
+
+**Format the sensor values**
+Add the following to your `sensor`
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  - platform: sensehat
+    display_options:
+        - temperature
+        - humidity
+        - pressure
+
+  - platform: template
+    sensors:
+      sensehat_temperature:
+        value_template: '{% raw %}{{ states.sensor.temperature.state | round(1) }}{% endraw %}'
+        unit_of_measurement: '°C'
+      sensehat_pressure:
+        value_template: '{% raw %}{{ states.sensor.pressure.state | round(1) }}{% endraw %}'
+        unit_of_measurement: 'mb'
+      sensehat_humidity:
+        value_template: '{% raw %}{{ states.sensor.humidity.state | round(1) }}{% endraw %}'
+        unit_of_measurement: '%'
+```
+
+**Give the values friendly names & icons**
+Add the following to your `customize`
+
+```yaml
+# Example configuration.yaml entry
+customize:
+  sensor.sensehat_temperature:
+    icon: mdi:thermometer
+    friendly_name: "Temperature"
+  sensor.sensehat_humidity:
+    icon: mdi:weather-rainy
+    friendly_name: "Humidity"
+  sensor.sensehat_pressure:
+    icon: mdi:gauge
+    friendly_name: "Pressure"
+```  
+
+**Create a group**
+Add the following to your `groups`
+
+```yaml
+# Example configuration.yaml entry
+group:
+  sense_hat:
+    name: Sense HAT
+    entities:
+      - sensor.sensehat_temperature
+      - sensor.sensehat_humidity
+      - sensor.sensehat_pressure
+```
+Add the _sense_hat group_ a group (_Kitchen for example_)
+```yaml
+# Example configuration.yaml entry
+group:
+  kitchen:
+    - group.sense_hat
+```
+
+
+### Directions for installing on Raspberry Pi All-In-One installer and HASSbian:
+Here are the steps to make the _SenseHAT_ sensor work _successfully_ with the virtual enviroment versions.
+
+#### Install SenseHAT package to _homeassistant_venv_
+```bash
+# switch to the homeassistant_venv environment
+sudo su -s /bin/bash homeassistant
+source /srv/homeassistant/homeassistant_venv/bin/activate
+
+# install the sense-hat lib
+pip3 install sense-hat
+# be patient, this will take a long while
+```
+#### Return to `pi`
+Type `exit` to quit out of the _homeassistant_venv_ back to your `pi` environment.
+
+As all of the following steps should be under the `pi` user environment.
+
+###### Install _RTIMU_
+
+```bash
+# Install RTIMU to pi user environment
+pip3 install rtimulib
+
+# Add symlink to RTIMU in _homeassistant_venv_
+# Create a symlink using the following command:
+ln -s /usr/lib/python3/dist-packages/RTIMU.cpython-34m-arm-linux-gnueabihf.so /srv/homeassistant/homeassistant_venv/lib/python3.4/
+
+# Add _homeassistant_ user to the _input_ and the _i2c_ groups
+sudo addgroup homeassistant input
+sudo addgroup homeassistant i2c
+
+# Reboot Raspberry Pi to apply changes
+sudo reboot
+```
+
+Unfortunately enabling the SenseHAT Sensor component for a Virtual Environment install of Home-Assistant fails with errors.
+_(The Raspberry Pi All-In-One installer and HASSbian both run Home-Assistant in an virtual environment)._
+These issues have been discussed in the repository issue (#5093)[https://github.com/home-assistant/home-assistant/issues/5093)
+
+This fix has been tested with a clean install of:
+
+* [Raspbian Jessie - version January 2017](https://downloads.raspberrypi.org/raspbian/images/raspbian-2017-01-10/) 
+ 
+and
+ 
+* [Home-Assistant 0.37.1](https://home-assistant.io/getting-started/installation-raspberry-pi-all-in-one/)