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A project log for Zamek: The Offline Pocket Password Manager

Creating and retrieving passwords for all your accounts has never been this easy and convenient!

jareklupinskijareklupinski 01/27/2018 at 03:335 Comments

After a ton of excellent feedback regarding IP68 protection, I have decided to use buttons instead of a trackball for the initial version of the Zamek. I will keep the code for the trackball in comments and possibly revisit it for version 2, but right now my priority is to get this out the door soon!

I'll finish testing when my battery comes in, then start looking at simple watertight enclosures. I'm thinking clear silicone?

Discussions

Morning.Star wrote 01/27/2018 at 10:32 point

Thats neat and tidy. :-)
I've had great success making things like that watertight with shrink tube and silicone, or good old hot glue. Both of them need a scaffold of some sort to stop them from separating where the Molex emerges, a silicone boot wont stay waterproof for long. I'd fill the back of the plug and round each end with hot glue and then shrink it up with clear tube and it should be watertight and visible, with workable buttons.
You might need to recess them a little so the shrink tube doesnt latch them on permanently, and trim up the glue with a knife to make it er, pretty ;-)

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jareklupinski wrote 01/27/2018 at 14:09 point

hmmmm, I'll try that out for my prototypes, and I'm wondering if there is a similar industrial process if I wanted to scale this up for the crowdfund rewards? I'll look into it :) thanks!

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Morning.Star wrote 01/27/2018 at 15:43 point

You're welcome :-)

Lol yeah, I'd think twice about a batch of a thousand too, but it isnt very labour intensive or fiddly. Waterproofing is as Rad said, challenging...

You can either seal out or repel water, silicone does not capillary so a seal doesnt have to be airtight to be watertight. Whereas hot glue must seal or the water will just wick under an edge. A detergent barrier prevents wicking there by breaking the surface tension but its temporary.

And if you used 'Capsense' buttons you could just pot it in a box with clear epoxy, no moving parts... You'll need an extra pin on your microcontroller for that tho.

I'm not aware of any processes but that doesnt mean there arent any. Good luck!

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ꝺeshipu wrote 01/27/2018 at 09:50 point

The trackball was unique, but I guess buttons are more practical. Making the USB plug water tight might be a challenge.

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jareklupinski wrote 01/27/2018 at 14:07 point

I'm still open to it in the future, I need to spend a little more time on it so that can be version 1.5 or 2 :)

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