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Simulate a matrix keypad with a microcontroller - Page 1
evaluation of 24 digital inputs - Page 2 - Raspberry Pi Forums
Matrix Keypad Circuit Diagram
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Matrix Keypad interfacing with Microcontrollers tutorial: - Rickey's
How to Interface 4x4 Matrix Keypad with LPC2148- (Part 6/9)
matrix - Controlling a keypad with same I/O in C - Stack Overflow