Re: [PSUBS-MAILIST] Green board?

["C hendrickson kids" <hendkids@oregontrail.net>]

I was/am considering the same type of thing for mine. Instead of magnets, I
thought to have it set up to complete a circuit and turn on the green light
when the hatch was closed. (not closed the light would just be off) Don't
know how bug-proof it would be though.

Alan

----- Original Message ----- 
From: "Ian Roxborough" <irox@ix.netcom.com>
To: <personal_submersibles@psubs.org>
Sent: Saturday, April 23, 2005 6:11 PM
Subject: [PSUBS-MAILIST] Green board?


>
> Hi,
>
> I was wondering, is anybody considering using classic red/green check
> lights board type thing to make sure all hatches and valves are closed
> before diving?
>
> It seems that this could be simple to construct; some small magnets
> and some reed switches hooked up a couple of transitors and LEDs (or a
> PIC/microcontrol if you want to get fancy).  Attach the magnets to the
> valve handle or edge of the hatch, and place the reed switchs in a
> static position (i.e. not on the handle) next to the magenets when
> the valve is in the closed position, so they will be activated in
> when the handle is in the closed position.
>
> Of course this isn't full proof, the magnet might be near enough to
> activate the reed switch when the hand is still slightly cracked open.
> So this isn't a first line of defence, but a second check that you
> didn't skip something on your check list by accident.  If you see
> any reds lights after your check list has been checked, then you
> need to investigate and go over your check list to make sure nothing
> else was missed.
>
> The nice thing about reed switches is that they don't create false
> positives in a damp environment.  Of course the connections to the
> reed switch (and any other electronics) will have to potted correct
> to prevent any short circuits when/if the humity rises.
>
> If I get some spare cycles I'll see if I can figure out the simplest
> circuit for a red/green board using reed switches.  If nothing else,
> it might look pretty. :-)
>
> Cheers,
>   Ian.
>
>
>
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