Pull in sbot's Servo board docs

Author: RealOrangeOne

docs/assets/docs/servo-schematic.pdf

@@ -4,8 +4,8 @@ title: Kit
 
 ## Boards
 
-Besides the Raspberry Pi, there are 3 main controller boards on your robot:
+Your kit consists of 4 main "boards":
 
-| [Motor Board](./motor-board.md) | [Power Board](./power-board.md) | [Raspberry Pi](./pi.md) |
-|---|---|---|
-| ![Motor Board](../assets/img/kit/mcv4b.png) | ![Power Board](../assets/img/kit/pbv4.png) | ![Pi](../assets/img/kit/pi.jpg) |
+| [Motor Board](./motor-board.md) | [Power Board](./power-board.md) | [Servo Board](./servo-board.md) | [Raspberry Pi](./pi.md) |
+|---|---|---|---|
+| ![Motor Board](../assets/img/kit/mcv4b.png) | ![Power Board](../assets/img/kit/pbv4.png) | ![Servo Board](../assets/img/kit/sbv4.png) | ![Pi](../assets/img/kit/pi.jpg) |

docs/assets/img/kit/sbv4.png

@@ -0,0 +1,58 @@
+# Servo Board
+
+The Servo Board can be used to control up to 12 RC servos. Many devices
+are available that can be controlled as servos, such as RC motor speed
+controllers, and these can also be used with the board.
+
+## Board Diagram
+
+![Board Diagram](../assets/img/kit/sbv4_diagram.png)
+
+## Indicators
+
+| LED   | Meaning              | Initial power-up state |
+|-------|----------------------|------------------------|
+| Power | The board is powered | On
+
+## Connectors
+
+There are 8 servo connections on the left-side of the board, and 4 on
+the right. Servo cables are connected vertically, with 0V (the black or
+brown wire) at the bottom of the board.
+
+For the servo board to operate correctly, you must connect it to the 12V
+power rail from the power board. A green LED will light next to the
+servo board 12V connector when it is correctly powered.
+
+## Case Dimensions
+
+The case measures 68x68x21mm. Don't forget that the cables will stick
+out.
+
+## Range of servos
+
+When using the majority of servos that we supply, you will find that the
+servo will only turn about 90 degrees.
+
+## Specification
+
+| Parameter                        | Value       |
+|----------------------------------|-------------|
+| Number of servo channels         | 12          |
+| Nominal input voltage            | 11.1V ± 15% |
+| Output voltage                   | 5.5V        |
+| Maximum total output current[^1] | 10A         |
+
+## Designs
+-------
+
+You can access the schematics and source code of the firmware on the
+servo board in the following places. You do not need this information to
+use the board but it may be of interest to some people.
+
+- [Full Schematics](../assets/docs/servo-schematic.pdf)
+- [Firmware Source](https://github.com/srobo/servo-v4-fw/)
+- [Hardware designs](https://github.com/sourcebots/servo-v4-hw)
+
+[^1]: If the auxiliary input is connected, outputs 8-11 have an independent
+   maximum current.