The PSU looks ok, note the connector is a 2.1mm jack on the board but a 2.5mm will fit but may be slightly lose.
Please make sure you use 5V regulated supply, the 5V rail has some protection for overvoltage but it is not regulated on board.
The USB in the base board is used for re-flashing the ARM, it is not designed for connecting stuff to.
/MikeJ