Introduction

  • Keypad 4x4 layout
  • Programming functions for the Arduino Uno
  • Example 

(30 minutes)

Keypad 4x4

A keypad 4x4, consists of:

    • 4 columns
    • 4 rows
    • 16 keys


The keypad rows go to the input pins of the Arduino Uno with the pull-up resistors activated. Keypad columns go to Arduino Uno output pins. The Arduino Uno sends sequential signals to the columns, and reads the rows. For example: if 8 is pressed, row 3 will be connected with column 2.




source 1, source 2