I've got an idea for a little project that uses the hot-shoe on top of the camera - I'm aware that the standard centre pin / foot connection is a universal thing but it would be useful if I could take power from the camera too.
My specific camera is a Pentax K5 which has a couple of extra contacts on the shoe, I don't know if this is Pentax-specific or a more universal standard that came along.
Does anyone have any information on the electrical side of the hot shoe, is there any sort of standard or does each manufacturer do their own thing? Any pinouts, voltages etc. would be greatly appreciated.