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![Only Three Pins for a 4x3 Keypad - Hackster.io](https://i2.wp.com/hackster.imgix.net/uploads/attachments/660623/arduino_analogkeyb_jUXIXlpbKn.jpg)
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Arduino Keypad Tutorial - 4X4 and 3X4 Keypad Connection Diagram
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Interfacing 4x4 Matrix Keypad with Arduino Uno
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Keypad 4x4 - Edukasi Elektronika | Electronics Engineering Solution and
![4 x 4 matrix keypad converter](https://i2.wp.com/shree-electronics.com/images/4x4_keypad.gif)
4 x 4 matrix keypad converter
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4x4 Keypad - EasyEDA open source hardware lab
![4X4 Matrix Keypad Module - Wiki](https://i2.wp.com/wiki.sunfounder.cc/images/f/f9/Keypad_schematic.png)
4X4 Matrix Keypad Module - Wiki
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4 4 Matrix Keypad Circuit Diagram
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4x4 Matrix Keypad Module - 16 Keys | How it’s Works » ElectroDuino