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Re: [PSUBS-MAILIST] Joysticks
Didn't this joystick topic get started with trying to control hydraulics
with a joystick?
If your trying to control two functions, each in two directions, with a
typical joystick, why even get involved with a pc of any kind? Sure you
can probably waterproof the electronics, but do you even need
electronics?
Remember K I S S! Keep It Simple Stupid!!!! Especially in a PSUB. The
more complicated it is, the more there is to turn a fun thing into a
disaster. Why not just use straight hydraulics?
Dan H.
Bjorn Johnsson wrote:
> Here is a watertight and flexible keyboard
> http://www.ece.utexas.edu/~sooter/blake.html
>
> --- Lew Clayman <lew_clayman@yahoo.com> wrote:
> > --- Paul B <paul_victor@hotmail.com> wrote:
> > > I'm afraid a watertight laptop would cost too much, if it is
> > possible at
> > > all. You have over 80 keys on the keyboard to make watertight.
> > And then you
> > > have your com ports, lpt port, usb, pc card adapter and so on..
> > >
> > > And it's hard to make a waterproof case for it, because if
> > there's not
> > > enough air to cool it down, it may overheat, lock up and there
> > goes your sub
> > > control..
> >
> > It's certainly possible, if perhaps fiduciarily challenging...
> > there are
> > mil-spec computers and machines made for nasty industrial
> > locations.
> > Waterproofing the keyboard is pretty easy, you use a continous
> > plastic
> > membrane: the action on the keys is pretty poor, but it works, as
> > do the
> > even-lousier pressure-membrane keyboards, cheap variants on which
> > are used on
> > kiddie toys (may you never be so afflicted). Waterproofing the
> > ports is no
> > harder than waterproofing anything else that opens, you have a
> > fitted cover
> > with a rubber seal. I'm not sure how they handle heat dissipation,
> > but I'm
> > guessing conduction, not convection. Can't be that hard.
> >
> > Another "solution" is to use old, cheap, used machines. They might
> > fail, but
> > who cares? This of course only works if you have a manual control
> > system that
> > doesn't need the computer, or in some other use where the computer
> > is
> > inessential.
> >
> > > If I had to make the whole thing safe from electric shock, I
> > would take a
> > > laptop with external battery and make something like a watertight
> > emergency
> > > power off switch on the external battery itself. Maybe some sort
> > of
> > > automatic relay, activated by water?
> >
> > This should work, too.
> >
> > -L
> >
> > =====
> > "It's never happened in the World Series competition, and it still
> > hasn't."
> > - Yogi Berra
> > =====
> >
> > __________________________________________________
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