Matrix user forums

Im trying a simple setup to make my keypad work. I've got the following datasheet for my keypad: http://www.farnell.com/datasheets/73830.pdf And with my 16f88 PIC I've created the following (europe symbols as far as i know :)). I've got my output LED's on port A and my input from my keypad on port B...

Hey :) Im doing a projekt where I have an input pin where the input can be different frequencies for example: 2000hz 1500hz 1000hz 500 hz How do I make flowcode do an action for each frequency? I've figured its an interrupt function, but I have no idea how to count it for like Β½ a sec or way less A...