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From: "Marc Dufour" <emdx@ac*.ne*>
Organization: 3615-CUL
To: techdiver@terra.net
Date: Thu, 7 Nov 1996 16:05:36 -5
Subject: Computer usage

It's been a while since I had a good flame, so I thought that the 
following might do the trick...

Okay.

Some people here are (understandably) reluctant to dive with 
computers. "There's nothing like a good dive plan" they'd say, and I 
guess they're not wrong.

After all, don't we all get hammered with the "Plan your dive, dive the 
plan" song at sometime in our life?

So it may come with no surprise that some serious people shun 
computers (especially if they dive with "exotic" gases), and they 
will have a program that will generate for them custom dive tables 
that they will then plastify and carry along with them. That's nice, 
because a sheet of paper hasn't got batteries to fail nor a 
microprocessor to bug.

Of course, unless one rigorously tracks down their time/depth curve, 
any repetitive dive planning will treat the previous dive as a square 
dive, with additionnal "penalty".

How about carrying a "continuous logging bottom timer", which keeps 
for each minute (or smaller time units) the depth for the whole dive? 
That's *ALL* the thing does. 

When you surface, you feed the figures to the laptop that will digest 
them and spit out a suitable repetitive dive table, optimized 
according to the profile you actually followed during the previous 
dive. Hey, you could pick and choose the decompression algorithm you 
want, even program your own, since you run them on a standard laptop.

This way, you *STILL* have to dive your plan, and in case the CLBT 
conks-out, you still have your paper table which you follow; you just 
won't have the finely tracked dive profile to feed the computer 
afterwards.

I find the idea very seductive, especially that Texas Instruments 
ships out microcontroller evaluation boards for $37.00 (go look at

http://www.ti.com/sc/6008

All you need to add is the pressure transducer, a case and interface.

You could conceivably make a cheap and sturdy unit; all it does is 
track time and depth. You put in a infrared link to go through the 
clear plastic casing (HP laptops have infrared links, too) and you 
could even recharge the whole thing with an inductive system, say 
like Water Pik electric toothbrushes.

Since the unit has no display (so you'll have to carry your watch
and depth gauge for reduntancy), you don't need to strap it to your
arm or console. Just shove it in a BC pocket, or butt-mount it where
it will be as much hogarthian as possible.

So, what do you think? 
Gentlemen, I'm waiting for your flames.

------------------ Pour la Republique Francaise du Quebec --------------------
Thanks to American influence, instead of thinking on how solve social problems
or feed everybody properly,the elites of the world only think on how to expand
their wealth, personal power and influence at the expense of other people. Our
children will be happy to live on a planet left in shambles by those "people".

~~  Last dives: still the Aloha, the Effie Mae & the Wolfe Islander, 25 mfw ~~
   This is a long signature; Toto, I don't think we're on FIDONET anymore...
   Marc Dufour - [\] ACUC6 31874 - TDI CD-0197 - http://www.accent.net/emdx 

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