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Buttons double firing -- please help

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MonitorGuru:

The way microswitches are made, it's' very hard to get bounce. A lot easier on a leaf switch.

A microswitch includes a curved piece of metal. Once it is pressed enough, the metal QUICKLY and securely snaps to the opposite terminal (usually) providing almost zero bounce and always BREAK before MAKE functionality.

The only thing that would give bounce would be very dirty contacts inside (e.g. ones that are simply old, or ones that have succumed to oxidation through sweat/oil falling in them from a bad control panel/button or other humididty changes)

To control bounce, you can put very small ceramic disc capacitors on the line.

ShinAce:

Yep, sounds like an old switch that soon needs replacing.

tommy:

Do you have a few buttons wired to one microswitch , sounds like a ground oroblem.

redcoats:

This actaully sounds like the buttons are hooked up wrong? There should be three prongs on the microswitches. Ground goes on the further back prong and the power goes to the middle if it is not hooked up this way it will be like auto fire. If you do have them hooked up correctly I have no idea what the problem is? :P

cdbrown:

I had this problem on one of my buttons.  Push it in slightly and it would register the press, keep pushing in further and it wouldn't register anymore.  I opened up notepad to test all my buttons - all but one would register the corresponding letter once when pressed quickly, if help down all but one would repeat the corresponding letter.  Replaced the faulty microswitch and everything works.

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