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'[OT:] Prototype membrane panels?'
2003\12\24@123721 by fred jones

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Hi all,
I have seen some devices that are built as home projects that have a nice
panel on them that have a membrane type switch panel.  I'm curious if anyone
knows how to do this?  I'm thinking of tactile switches with a panel label
over them but don't know how to mount everything or how far from the panel
should they be?  If anyone knows of any examples on the net that are spelled
out, I would appreciate it.  I looked around but couldn't find anything.
Thanks,
FJ

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2003\12\26@045738 by cdb

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I forget their name for the moment, but there is a company who have a
website that produce such things.

Search the pic archives back to early last year, this topic was
discussed then, which is when i found the site I now can't remember.

Colin
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2003\12\26@054415 by Russell McMahon

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> I have seen some devices that are built as home projects that have a nice
> panel on them that have a membrane type switch panel.  I'm curious if
anyone
> knows how to do this?

> I'm thinking of tactile switches with a panel label
> over them

That's one method (and a superior one). A common alternative is to have a
formal "membrane keyboard". These essentially consist of three layers of
plastic (usually Mylar/Polyester). The top and bottom layers have metallised
traces on them to form thre switch contacts and the middle layer has holes
allowing the two outer layers to be pressed together by finger (etc)
pressure. Somewhat superior results are achieved by embedding tactile snap
domes between the layers to give the keyboard some "feel".

A membrane (aka sheet of plastic) over a sheet of solid plastic eg 3mm+
polycarbonate or whatever with holes therein and tact switches mounted "just
right" behind it produces a far far better result than the above. "Real"
people mount the tact switches on a spearate panel which cam be adjusted for
position (depth behind the fron panel) so that the tact switches are
positioned "just right". One arrangement I know of uses o rings around the
screws between the front panel and tzct switch panel - the o rings are
compressed as the screws are tightened, allowing the gap to be adjusted.
This is amechanically annoying solution but far better than simple membrane
keyboards.

> but don't know how to mount everything or how far from the panel
> should they be?

The distance that works properly for the chosen switch :-) - hence the above
method.



       Russell McMahon

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2003\12\26@083516 by SavanaPics

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If you are looking for a manufacturer, try Syl-Walker, they have a nice stock
as well as offer custom work. If you can't find them, let me know and I will
dig out an invoice and get you an address

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2003\12\27@013214 by M. Adam Davis
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If you are in the US you'll find a membrane keypad (3 by 5 keys) and
matching project box for not too much money.  Comes with a 9v battery
compartment and an IR filter for the front for easy remote control projects.

-Adam

fred jones wrote:

{Quote hidden}

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