Russell McMahon email (remove spam text)
> I guess I could make up a little PCB to mount the switches to, and mount
> tact switches to that. Of course, then I'd have to mount the PCB at the
> right height from the case and make square holes for the key caps.
Making holes in a panel with a diaphragm over it and tact switches behind
the diaphragm works reasonably well.
Mounting height is important and the ability to change this is probably
vital in a one off (and is helpful even in a many-off - I have some friends
who do this in a commercial product and it works very well BUT the board to
panel spacing is adjustable.
A laborious but workable one-off solution is to use fully threaded screws
for the mounting towers with the pcb held between 2 nuts. The board height
can be adjusted up and down the screws to get the height right. You can then
locknut the screws (aaaargh!!!) or if nobody is looking a blob of silicon
rubber will work just fine. The proper practices police may catch you
Some membrane keyboard makers offer internal "click" domes which give the
membrane switches a reasonable if not ideal feel.
A out of the square solution is to use crummy feeling switches and add an
audio annunciator to make a crisp audible click on keypress. Seems to work
reasonably well for less than fully deaf people. Many touch/membrane
keyboard products do something like this (eg palm Pilot and friends.)
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads
See also: www.piclist.com/techref/index.htm?key=pushbutton+switches
You must be a member of the
piclist mailing list
(not only a www.piclist.com member) to post to the