Added Sheepwalk RPI2 1-Wire Adapter

src/en/overlay/sheepwalk-rpi2.md

@@ -0,0 +1,36 @@
+<!--
+---
+name: Sheepwalk RPI2 1-Wire Adapter
+class: board
+type: com
+formfactor: Custom
+manufacturer: Sheepwalk
+description: I2C to 1-Wire host adapter
+url: http://www.sheepwalkelectronics.co.uk/RPI2.php
+buy: http://www.sheepwalkelectronics.co.uk/product_info.php?products_id=30
+image: 'sheepwalk-rpi2.png'
+pincount: 10
+eeprom: no
+power:
+  '2':
+  '4':
+ground:
+  '6':
+  '9':
+pin:
+  '3':
+    mode: i2c
+  '5':
+    mode: i2c
+i2c:
+  '0x18':
+    name: DS2482
+    device: DS2482-100
+-->
+#Sheepwalk Electronics RPI2 1-Wire Host Adapter
+
+This module provides a way to connect 1-Wire devices to your Raspberry Pi without using up one of the USB ports. It is based around a DS2482-100 I2C to 1-Wire IC. 
+
+Connection to your 1-Wire network is either by the RJ45 socket or the screw terminals. The RJ45 socket is wired to the same standard as all our modules to allow the easy assembly of a network using standard ethernet cables. It includes +5V on pin 2 for any modules that require it. 
+
+The jumpers on the RPI2 allow you to set the i2c address of your RPI2. For most people it won't matter what it is set to but if you have multiple RPI2s or you also have other i2c devices on the bus you might need to change the address. By default the i2c address is 0x18 but it can also be configured to be 0x19, 0x1a or 0x1b.

src/en/settings.yaml

@@ -105,3 +105,4 @@ overlays:
 - adafruit-gps-hat
 - uugear-zero2go
 - adafruit-pigrrl-pcb
+- sheepwalk-rpi2