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4x4 Matrix Keypad interface with 89C51 | circuits4you.com
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4x4 Matrix Keypad Interfacing with PIC Microcontroller
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![arduino mega - 4x4 matrix keypad - Multiple inputs cause extra readings](https://i2.wp.com/i.stack.imgur.com/7GbUd.png)
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![Arduino: Library for multiple keypads](https://i2.wp.com/blog.hobbycomponents.com/wp-content/uploads/2015/01/Matrix_Keypad.png)
Arduino: Library for multiple keypads
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Interface 4x4 Matrix Keypad With Microcontroller - EmbedJournal
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Use 4x4 keypad with STM32 » ControllersTech
![How to use Matrix Keypad](https://i2.wp.com/docs.toradex.com/101907-matrix-schematic.png)
How to use Matrix Keypad