Hello, there is someone who can help me with a user and password access control with 4x4 matrix keyboard, but at the time of accessing let me change a variable already defined and everything is printed on the serial port.
Sure. After reading the "How to get the best out of this forum" post, follow the directions to post your code, using code tags, and explain where you are having trouble.
Forum members will probably want to see a wiring diagram, as well.
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