4x4 Matrix Keypad Circuit Diagram
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4X4 Matrix Keypad Module - Wiki
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Using i2c with a 4×4 matrix keypad
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Keypad module matrix connection
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![Arduino: Library for multiple keypads](https://i2.wp.com/blog.hobbycomponents.com/wp-content/uploads/2015/01/Matrix_Keypad.png)
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![How to use Matrix Keypad](https://i2.wp.com/docs.toradex.com/101907-matrix-schematic.png)
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