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Simulate a matrix keypad with a microcontroller - Page 1
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4x4 Matrix Keypad Circuit Diagram
How to Interface 4x4 Matrix Keypad with LPC2148- (Part 6/9)
Arduino 4X4 Keypad Matrix Keypad Membrane Switch
In-Depth: Interface 4x3 & 4x4 Membrane Keypad with Arduino
matrix - Controlling a keypad with same I/O in C - Stack Overflow