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Gammon Forum : Electronics : Microprocessors : Using a keypad matrix

4x4 Matrix Keypad Module - 16 Keys | How it’s Works » ElectroDuino

Arduino Keypad Tutorial - 4X4 and 3X4 Keypad Pin Diagram | Arduino
![[DIAGRAM] Circuit Diagram 4x4 Matrix Keypad - MYDIAGRAM.ONLINE](https://i2.wp.com/www.next.gr/uploads/17/Schematic_4x3_Keypad_AVR.gif)
[DIAGRAM] Circuit Diagram 4x4 Matrix Keypad - MYDIAGRAM.ONLINE

4x4 Matrix Keypad Circuit Diagram
![[DIAGRAM] Nokia 101 Keypad Ic Diagram - MYDIAGRAM.ONLINE](https://i2.wp.com/wiki.sunfounder.cc/images/f/f9/Keypad_schematic.png)
[DIAGRAM] Nokia 101 Keypad Ic Diagram - MYDIAGRAM.ONLINE