Keypads are handy for a variety of projects, from security access to telephone dialing. In this tutorial, we use a Adafruit membrane keypad, and output the button presses to the serial monitor. Nothing fancy, just a platform for future development. Expand the Library in your sketchbook/libraries/ folder. The next step will be to multiplex the lines so we don’t use up 7 inputs with a SN74LS151 (reduces Arduino pins to 3, expands inputs up to 16).
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