HackSpace – September 2019

FIELD TEST

ADAFRUIT $6.50 adafruit.com

Easy to use

and reliable.

VERDICT

9 / 10

ot a project that requires a

stealthy code to be input? If so,

this is the keypad for you! The

Adafruit 3×4 Matrix Keypad has

twelve buttons, arranged in a

traditional telephone keypad grid.

They are wired in a matrix, which can easily be read

by a microcontroller using only seven pins. Adafruit

includes a library to get your Arduino project up and

running. A row of header pins is also included so

you can easily prototype with it on a breadboard.

G

3×4 Matrix Keypad

Adafruit includes a

library to get your Arduino

project up and running

”

”

Just like Adafruit’s membrane keypads, the mechanical matrix keypad

is available in multiple sizes. The larger 4×4 matrix is also arranged in a

telephone-style layout and will work just as easily as the smaller version

with your microcontroller. With this keypad, your code can include a few

alphanumeric inputs, making it extra secure.

4×4 MATRIX KEYPAD

ADAFRUIT $5.95 adafruit.com

Left

Need more

keys? Try the

larger 4×4

matrix keypad

Left

A great way to get

fast and reliable

keypad input