The top 3 set of terminals on the right of the board is used to supply or take power, with the top pin being 5V and bottom two ground. In many applications these do not need to be connected to anything, as the PiFace Digital 2 will be powered by the Raspberry Pi | The top 3 set of terminals on the right of the board is used to supply or take power, with the top pin being 5V and bottom two ground. In many applications these do not need to be connected to anything, as the PiFace Digital 2 will be powered by the Raspberry Pi |