Many keypads are organized by column and row. You might try using an ohmmeter and pressing a key till you get continuity. A typical arrangement is four parallel vertical lines crossing four parallel horizontal lines. The key will connect at the cross and will be addressed at that row and column. There is a Motorola cmos chip which will connect the row and column closures into a BCD. I don't know the number off hand but I can get it for you. Please respond to my email address.

Richard

1 -----Original Message-----
From: Lalakis Parafyadas <lalakis_hack@HOTMAIL._OM>
To: PICLIST@MITVMA.MIT.EDU <PICLIST@MITVMA.MIT.EDU>
Date: Monday, May 24, 1999 9:30 PM
Subject: [ÏÔ] 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