Hello Jeff,

> The keypad had 12 individual buttons that went into two parallel to serial
> shift register chips - it only took two or three pins on the PIC.  It's
> trivial to adapt that circuit to 16 buttons with just adding buttons, more
> with adding more buttons, another chip and a moderate code tweak.

    I've done something similar using a pair of 4051s on a circuit I already
have another pair of 4051s to read from 16 pots. Just used two other PIC
inputs for keys the 4051 input-select lines are the same for all of them.

    Best regards,

    Brusque

-----------------------------------
Edson Brusque
Research and Development
C.I.Tronics Lighting Designers Ltda
Blumenau  -  SC  -  Brazil
www.citronics.com.br
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