Here is my design, that has worked for me for a very long time. I used to make time-lapse camera systems, including underwater systems. Fun stuff!
Hope it helps.
m
HotShoe FO Sch A1.pdf
IFE97 BrightRed.pdf
HotShoe_FO PCB Trim B.pdf
Hiya,
Diving since 1993.
Film photography with Sea&Sea system... still have on a shelf.
Digital photography starting with Nikon Coolpix 950 (Revolutionary!) in Ikelite housing.
Now using TG6.
Diving mostly in Bonaire these days.
m