Which protocol to implement on a home brewed diving computer ?

[Robert Helling]

Thomas,

> On 16.03.2015, at 14:29, Thomas Schrein (mailinglists) <tsx508 at schrein.de> wrote:
> 
> The housing of oDiCo is made from plexiglas version 0.1 and filled with silicon oel. The next housing 0.2 will be milled from POM and the electronic will be an industry factored PCB. Awating to have it in the lake in June ...


once you are in the habit of making housings, you might be interested in a project idea that came up here a while ago: We all love to have cylinder pressure graphs in our logs. But for the dive computer to records those you either need a hose that tends to be in your way or a radio transmission which is hard to make reliable. The idea was, during the dive to stick with an analogue gauge (as the history is mainly important in the log only) but attach a little data recorder with pressure sensor directly to the first stage to be read out later together with the dive computer.

I did not really pursue this idea much further since all the pressure sensors I could find that fit the specs (up to 400bar with at most a few bar resolution an simple readout) almost costed as much as the pressure radio transmitters (120-150 Euro/pcs) and, more importantly, my total lack of experience in building watertight housings.

You might be at least the solution to part two of the problem. What do you think?

Best
Robert

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Robert C. Helling     Elite Master Course Theoretical and Mathematical Physics
                      Scientific Coordinator
                      Ludwig Maximilians Universitaet Muenchen, Dept. Physik
                      Phone: +49 89 2180-4523  Theresienstr. 39, rm. B339
                      http://www.atdotde.de

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