You can use an old rotary telephone dialer in conjunction with your microcontroller to implement all sorts of things; for example, you could use it to enter a series of numbers to unlock a safe. You ...

One of the useful side effects of the ubiquitous availability of cellular network data modules is that they can be used to create custom mobile phones. It’s surprising in a way that we don’t see as ...

The pulse-dial telephone and its associated mechanical exchange represents the pinnacle of late-19th and early-20th century electromechanical technology, but its vestiges have disappeared from view ...