In this project a 4×3 matrix keypad is interfaced to the microcontroller, which is a 12-key keypad consisting of four rows and three columns. ... These are connected in such a way that the column lines acts as input to the microcontroller , and the row line as output lines. The input lines are pulled up internally
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4 x 3 Matrix 12 Key Array Membrane Switch Keypad Keyboard for Arduino
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