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> You don't say what your application is, apart from being underwater, =
but
> could you make your own switch?


I am rather limited about what i can say about the project. It is not so =

much underwater continously, but the device may be submerged for i =
dunno..
half an hour on the way to being used (but may still be active in water. =



>I didn't catch the early part of the thread, sorry... But if you are=20
>looking for tiny waterproof switches,
>you MIGHT try IR emitter/receiver pairs. The ones I used are about 4mm =
x=20
>4mm SMT (4p) and
>will reflect anything within 3mm. I designed a waterproof switch that=20
>worked through a clear Lexan
>sheet (for underwater controls). The PIC driving it would pulse the=20
>emitter every 40mS then look for
>a reflection in the receiver. It turns out that a finger or glove will=20
>easily reflect the IR beam back into
>the receiver, but water will not. It formed a small waterproof keypad.


I hate being the awkward bastard, but it needs to be a definate on/off =
thing. It cant beep, or emmit any light - especially IR (it would need =
to be verrrrry dim, i.e. far less than a tv remote) but i do have =
another hobby project that i might use the idea for.

Steve

P.S I owe you all a virtual pint.

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