Greeting...I am trying to Connect two PIC microcontrollers

[HenrikOlsson]

Hi,
I really don't understand. Use any four of the available pins as outputs and any three of the available pins as inputs - or the other way around - that's it.

[Freestyle]

Thank you,

I am embarrassed to ask this.. I found this website but not sure what pins are what in the actual keypad. May you help me with it?
http://www.pic-tronics.com/7-Segment...eypad-Int-.php

this is the schematic http://www.acroname.com/robotics/par...3X4-KEYPAD.pdf

[HenrikOlsson]

Hi,
Look at the table on the datasheet. It'll tell you that when '1' is pressed you'll get a connection between pins 2 and 3. When '2' is pressed you'll get a connection between pins 2 and 1 and when '3' is pressed you'll get a connection between pins 2 and 5.
This means that since '1' and '2' and '3' are on the same row the common connection to that row must be pin 2. The connection to column 1 would be pin 3, column 2 would be pin 1 and column 3 would be pin 5.

If you draw that out on paper you'll get something looking like this:



Hope it helps.

/Henrik.