Hello Hopkins,

>How much should one allow for a switch denounce on a digital port 20,40,100ms?
>
>
    years ago I've made a routine for treating buttoms that I'm still using.

    It runs on an interrupt that occurs once every millisecond on most
applications and have a keyDebounce variable that usually (with no key
pressed) have it's value equal to 50.

    While a key is pressed the routine decrements keyDebounce. When
keyDebounce is equal zero, the code of the key is put on the keyBuffer
variable and keyDebounce = 250.

    Next time (we also have a keyCounter variable) the keyDebounce is
equal zero, key code is put on keyBuffer again a now keyDebounce =50.

    It makes a nice repeating keyboard implementation and you could even
implements "accelerating" keypresses. It works very well with all the
buttoms/keys I've tried. I think I already used more than 6 kind of buttoms.

    Best regards,

    Brusque

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Edson Brusque                     C.I.Tronics Lighting Designers Ltda
Research and Development                   Blumenau  -  SC  -  Brazil
http://www.suporte.ind.br/ryan/netiqueta.htm     www.citronics.com.br
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