Hello,

     I've been thinking about using the PIC A/D to scan a 16 keys
keyboard. The example bellow have only 4 keys for simplicity:

             ,----K1----VDD
             |
             1k
             |
             +----K2----VDD
             |
             1k
             |
             +----K3----VDD
             |
             1k
             |
      ADC----+----K4----VDD
             |
             1k
             |
            GND

     Without any key pressed, the ADC would read 0V, with K1 pressed it
would be 1.25V, with K2=1.66V, K3=2.5V, K4=5V.

     I think this would be very interesting for projects using a PIC
with ADC and short of I/O.

     Best regards,

     Brusque

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