Description
This matrix keypad has 12 buttons arranged in a 3 x 4 pattern. The number pad is similar to that found on a telephone. Since the keypad uses a matrix arrangement, only 7 digital inputs are require to add this to your project.
The connector uses a standard breadboard pitch (0.100” / 2.54mm) and can be used with the standard Arduino Matrix Keypad Library found in the Arduino IDE.