[Alex] has been working with Arduino for some time now, but always thought it lacked some features which advanced users would ... allows you to have multiple projects open at once.

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 ...

First off, projects centered on electronic ... and Mega are great examples of this. Some Arduino boards, however, feature ...