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[johnredearth]

Hi all
Over the past few years I have built two scratch-built subs, which some of you will be aware of.  I have developed a ballast system which appears to be unique and control it with arduino.  I have recently written a blog about this with a link to four videos that pick up obvious stuff that I have not addressed before all that well. I guess this is the definition of an obsession!  For your interest and hopefully inspiration!
http://www.scratchbuildwithjohn.com/public/how-to-scratchbuild-a-submarine/
John