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![Read a 4x4 Matrix Keypad | LEARN.PARALLAX.COM](https://i2.wp.com/learn.parallax.com/sites/default/files/content/propeller-c-tutorials/simple-devices/MatrixKeypad/4x4-Keypad-Schematic.png)
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![arduino mega - 4x4 matrix keypad - Multiple inputs cause extra readings](https://i2.wp.com/i.stack.imgur.com/7GbUd.png)
![Keypad Interfacing with 8051 Microcontroller (AT89S52)](https://i2.wp.com/circuitdigest.com/sites/default/files/circuitdiagram_mic/8051-Keypad-Interfacing.gif)
![Arduino: Library for multiple keypads](https://i2.wp.com/blog.hobbycomponents.com/wp-content/uploads/2015/01/Matrix_Keypad.png)