Merge pull request #375 from srobo/power-board-l2

Mention that the brain board must be powered using L2

Author: sedders123

kit/brain_board/index.md

@@ -22,14 +22,19 @@ The LEDs on the HAT display the current status of the robot and can be used to h
 
 ![brain board assembly diagram]({{ site.baseurl }}/images/content/kit/brain-diagram.png "The Brain Board Assembly")
 
+## Powering the Brain Board
+
+Your Brain Board will not power on unless it's connected to the "L2" port on the Power Board. 
+This is because the rest of the power outputs are disabled until the usercode runs. 
+
 ### Indicators
 
-| LED              | Meaning                 
+| LED              | Meaning
 |------------------|-------------------------
-| 5V Power         | The board is powered    
-| 12V Power        | The board is powered    
+| 5V Power         | The Brain Board is powered
+| 12V Power        | The KCH is powered
 | Reverse Polarity | The 12V power is reversed
-| Boot Progress    | Progress Bar for Brain Boot Progress 
+| Boot Progress    | Progress Bar for Brain Boot Progress
 | Code             | A USB containing code is plugged in
 | Comp             | The Robot is in Competition Mode
 | WiFi             | The Robot WiFi hotspot is running

kit/power_board.md

@@ -10,8 +10,8 @@ Power Board
 	<img src="{{ site.baseurl }}/images/content/kit/pbv4.png" alt="A photo of a power board" title="The Power Board, click to view larger" width="250px" class="right" />
 </a>
 The Power Board distributes power to the SR kit from the battery. It provides
-six individual general-purpose power outputs along with a separate power connector
-for the Brain Board.
+eight individual general-purpose power outputs, with one reserved for powering
+the Brain Board.
 
 It also holds the internal On|Off switch for the whole robot as well as
 the Start button which is used to start your robot code running.
@@ -28,8 +28,14 @@ These are enabled when your robot code is started, and supply around 11.1V
 (±15%). They should be used to connect to the motor and servo board power
 inputs. The "H" connectors will supply more current than the "L" connectors.
 
+<div class="warning">
+  When connecting the brain board, the "L2" port should be used.
+  This ensures the Brain Board can turn on before the rest of the power
+  outputs. Your Brain Board will not power on unless it's connected to "L2".
+</div>
+
 The 5V connectors can be used to connect low-current devices that take 5V
-inputs, such as the Brain Board.
+inputs.
 
 There is also a Micro USB B connector which should be used to connect the Brain
 Board for control of the power board.