Here is a simple, yet useful circuit of an Arduino 4-digit 7-segment LED display unit. The module used here is a self-contained, compact common-cathode module containing four 7-segment LED numeric ...

It is a pretty common first project to use an Arduino (or similar) to blink an LED. Which, of course, brings taunts of: you could have used a 555! You can, of course, also use any sort of oscillato… ...

Adding to the ever growing list of Ardunio watches being created a new LED Arduino watch has been created that is powered by a supercapacitor.. The watch has been featured over on the Hack A Day ...

Controlling 64 LEDs over a three-wire interface ... To actually power and control the entire circuit, [Martyn] used an Arduino loaded up with ... He forgot to install the flux capacitor :P.