Digital touch Screen Combination lock

[richard]

The unused pins either i will pull them up with a resistors, or i will make ports outputs and set them to low.


I see in your code you have made those unused pins as inputs.

my answer is the same as you asked last time-


if your program if affected by unused pins then your program is defective.


when bread boarding unused pins left as inputs are less likely to be damaged by
inadvertent connection.


chip current consumption can be reduced by not having floating pins (by a few micro amps).
enabling weak pull on unused inputs will stop them floating but consumes a few micro watts.
setting unused pins low and as output consumes the minimal possible micro watts.
the same can be achieved leaving them as input but physically grounding them.

if the project is to be battery driven i will worry about unused pins in the final production version
otherwise it is of no consequence.