Want to use a Keypad in your Arduino projects but running out of Pins?
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Using Keypads with Arduino - Build an Electronic Lock
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HariFun #143 - How to read a 4x4 keypad using just one Arduino pin!
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[ICStation.com] BitBastelei #278 - MCP23S17/MCP23017 IO-Multiplexer
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A Rotary Encoder that’s Always on the Money!
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Arduino DIY electronic miter box? Stepper control with keypad and LCD - Tutorial
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Keyboard PCB | Serial output | Alphabet Numbers Signs
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How to Set Up Keypads on the Arduino - Ultimate Guide to the Arduino #22
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