8 pins on a keypad suggests a direct row x column matrix (i.e. 7 used)
rather than BCD (which would only need 5 or possibly 6 = 4 data  + 2 power).

Can you see any logic ICs etc. anywhere?

What about multimeter readings between pins when a pad is pushed - do you
get any change? - Use a high resistance range to limit current to as low a
level as possible - just in case.

Richard


-----Original Message-----
From: Lalakis Parafyadas [mailto:lalakis_hack@HOTMAIL.COM]
Sent: Wednesday, May 12, 1999 8:49 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: [??] Help needed with Keypad shown in photo


Hey! I recently got a keypad to use with the PIC 16F84 for an application.
The problem is I've tried anything but I can't make it work. It's supposed
to give BCD code as an output but I don't know what kind of decoder circuit
it needs to do that! Take a look at the picture and let me know if you've
worked with something similar before. (it's supposed to be a touchpad, if
that's important...) Thanks in advance, Argiris