4) Offer commands, such as ENTER, LOAD, CLEAR, etc. 5) Type words, letters, numbers, and executable commands. Each of the buttons are labelled, and the software eliminates switch bounce like a boss!

(keypad: columns and rows switching) So now you can see how the button presses can be translated into electrical data for use with a microcontroller. We can now start the real experiment with as ...

If you want to add a keypad to your Arduino project, the options are pretty limited. There’s that red and blue 4×4 membrane we’ve all seen in password-protected door lock projects,… ...