https://www.seeedstudio.com/eblock-Expansion-Module-NET-Gadgeteer-Compatible-p-991.html
eblock Expansion Module - .NET Gadgeteer Compatible
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...
expansion modulenet gadgeteereblockcompatible