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4x4 keypad schematic
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![4x4 matrix Keypad schematic | Fingerprint door lock, Arduino, Lcd](https://i.pinimg.com/originals/f8/c8/ac/f8c8ac2966368ad828ca306a779e83c2.gif)
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4x4 keypad module pinout, configuration, features, circuit & datasheet .
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![Keypad Pinout](https://i2.wp.com/arduinogetstarted.com/images/tutorial/keypad-pinout.jpg)
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![evaluation of 24 digital inputs - Page 2 - Raspberry Pi Forums](https://i2.wp.com/www.gammon.com.au/images/Arduino/Keyboard Matrix1.png)