While there is much to be said for the multi-button input of modern gaming controllers, and even full keyboards, you can accomplish many tasks with only single button. That’s the idea behind this tiny Arduino setup from “Volos Projects.”
The body of this device is formed by a sharp looking black aluminum extrusion project box. An Arduino Nano almost fits inside as originally intended, but a much smaller Pro Mini is instead used to allow everything to fit properly. Along with the Pro Mini, a PCB for the tiny 645;48 pixel OLED screen is mounted inside, with wiring leading to the screen itself attached to the outside of the enclosure. A single button is added to the top as an interface, along with a switch that controls the system’s power from a 100 mAh battery.
The result is a tiny gadget that could be considered “cute” if it didn’t also look so rugged and industrialized. As shown in the video, it’s able to function as a handheld counter, a stopwatch, and even a Flappy Bird console. A parts list, plus the needed schematic and code, is available in the video’s description.