Keypads are a great way to let users interact with your project. You can use them to navigate menus, enter passwords, and control games and robots.
This keypad has 16 buttons, arranged in a telephone-line 4×4 grid. The keys are connected into a matrix, so you only need 8 microcontroller pins (4-columns and 4-rows) to scan through the pad.Check the tutorials tab for links to an Arduino library and example code.

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