teamhydraucd:
Thank you, that explained a LOT.Also, to save some pins on my microcontroller, is it possible to choose which part of the matrix keyboard I want functional ONLY?
for example, if I only wanted ['1' , '2' ; '4' , '5'] for a 2x2, can I just create the keyboard as a 2x2 matrix in my sketch and leave the rest nonfunctional?
Why would you need that? You don't have to use a matrix keypad. One pin for one key you use 4 keys, or two column by two row you also use 4 pins.