GHI's catalog is full of 3-pin eblocks. Those eblocks can be connected to any Gadgeteer mainboard using this extension. Note that you will need to use the drivers from the eblock page you are trying to use.All eblocks are listed here http://www.ghielectronics.com/catalog/category/3/ResourcesSource CodeExternal Linksyou need to download the following software to start your Gadgeteer:Development tool : Microsoft Visual C# Express 2010Micro framework: Microsoft .NET Micro Framework 4.1 SDKThe Gadgeteer core, mainboard SDk and module driver(GHI)You can download these tools at : http://tinyclr.com/support