Hello and thank you for your reply, So yes I have the dock but don't want to use the USB micro socket to power the onion. What I want to do is design a board that mounts on the 30 pin expansion socket to give me access to other things like 12c, SPI ect. but also want to have a 24VDC to 5 VDC supply on this board and want to feed the 5VDC into the expansion socket if this is possible?