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Keypad is one of the most common components for human-computer interface. one of the best methods to build a Keypad is to use a matrix keypad we will show how to use a 4 x4 keypad with keypad library Arduino. Matrix keypad has pins for each row and each column. so our 4x4 keypad has 8 pins.
Keypad pins 1,2,3 and 4 present the rows of the key pad and the are connected to digital pins 2,3,4, and 5 while the ther pins presents the columns.
Download Keypad Libarary