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4 by 3 membrane keypad

Abstract: keypad matrix 270 ohm resistor Matrix Membrane Keypad the program keypad scanning
Text: Application Note: Scanning The Keypad Matrix and Driving The LEDs 2 3 4 5 6 7 8 9 10 11 12 LED MATRIX RoHS COMPLIANT Row2 13 Row2 2 Row3 12 Row3 3 Row4 11 Row4 4 Column3 10 PINS 5 6 7 Column3 9 PINS 1 Column1 PINS 8 Column2 Row1 Column1 PINS Row1 14 Column2