My first Windows 10 IoT project using a Raspberry Pi 2 and PiFace Digital 2 to control my garage door via AllJoyn and/or AutoRemote.
For more details you can read this article on hackster.io
As part of this project I've setup a NuGet package for control of the PiFace Digital 2 based on work by Peter Oakes on microsoft.hackster.io.
To add the reference via NuGet: Install-Package Hastarin.Devices.MCP23S17