I had a PC like this with a 2 digit display. LED segments were switched on or off by the Turbo switch and an array of diodes. Some of the segments were permanently wired on, no switching at all.

Running out of GPIO pins? Learn how to connect multiple buttons to just one Arduino pin using clever wiring and resistor ...

Think of it as a Netflix and Chill button, but with maybe less Chill. The Netflix Switch is powered by a Particle Core, an Arduino-compatible development kit that features on-board WiFi.

The OONTZ uses a 3D printed case, a 16 button keypad, an Arduino Leonardo, a monochrome driver, and a few potentiometers. It's actually a pretty simple thing to build yourself provided you can the ...