Alan B. Pearce wrote:
>> This is where the plot thickens somewhat :S unfortunately
>> lighting of any kind is not really possible, and RF is not
>> practical either. This is why we are having such a problem
>> finding something, we have a lot of tricky requirements
>> which would not normally be a problem on their own,
>> but put together you end up with a complete biach. We were
>> thinking toggle switch but that are easy to catch on things
>> if they are attached to a person.
>> Hence my nearing insanity. Thanks again.
>>     
>
> You don't say what your application is, apart from being underwater, but
> could you make your own switch?
>
> A Perspex disc with a piece of fridge magnet mounted in it, with suitable
> method of detenting, mounted outside the waterproof case, operating a reed
> switch or hall effect device inside the waterproof case. Would allow you to
> have your own detent size - greater than the normal 30 degrees if you wish.
>
>   
I didn't catch the early part of the thread, sorry... But if you are 
looking for tiny waterproof switches,
you MIGHT try IR emitter/receiver pairs. The ones I used are about 4mm x 
4mm SMT (4p) and
will reflect anything within 3mm. I designed a waterproof switch that 
worked through a clear Lexan
sheet (for underwater controls). The PIC driving it would pulse the 
emitter every 40mS then look for
a reflection in the receiver. It turns out that a finger or glove will 
easily reflect the IR beam back into
the receiver, but water will not. It formed a small waterproof keypad.

They used to be sold by DK, made by Fairchild. I have misplaced the P/N.

--Bob

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