>> a bit 'off-topic' but if it would have been an PIC with a/d
>> then it's very easy to decode x number of keys ( there x is depedning on
>> number of bits in ad and cost for resistor ladder, but 16 keys
>> is a breeze with any resistors and 8 bit a/d ) with 1 pin :)
>> or perhaps 2 pins + some logic to have an additional 'key-down'=
 detection.
>With an R:2R ladder you can use each switch
>as a binary bit. This is a very clever idea
>Tony, if you have a R:2R resistor network in
>a SIL package.

        Isn't the same in resistive touch screen devices? ;o)


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Alexandre Souza
taito@terra.com.br
http://planeta.terra.com.br/lazer/pinball/

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