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Keypad

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JAMESWR

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Hello All
This is my first post, an excellent forum loads of helpful info and people.
I am starting my first pic using a 16F676 and have got most things working (LCD, IR and A to D).
But I am trying to run the keypad (4x4 matrix) off one A to D pin as in the Microchip Tips and Tricks but how do I go about working out the resistor values?

I found these very helpful from the Microchip site https://techtrain.microchip.com/x14/
 
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