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