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keypad matrix

Abstract: 270 ohm resistor 4 by 3 membrane keypad
Text: Application Note: Scanning The Keypad Matrix and Driving The LEDs 1 2 3 4 SWITCH MATRIX LED MATRIX RoHS COMPLIANT Row1 PINS 10 Row1 Row2 9 Row2 2 Row3 8 Row3 3 Row4 7 Row4 4 PIN 5 Column1 6 Column1 PIN PINS 1 Scanning The Keypad Matrix The membrane keypad can be interfaced easily to a bi-directional 8 bit port on a microprocessor.