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[wassupduckk]

hi, i was wodnering if anyone could explain or link me to some where that can explain the logic behind mobile phone key pads, by logic i mean how the use of a timer allows a single button to be interprted as 3/4 charcaters when pressed serveal times between a curtain time interval.
thanks

[dargueta]

All you need is a timer and a counter. On each press, you cycle to the next value you want to output (A, B, C, 1) and reset it back once the clock ticks a certain number of times, e.g. once a second or something.