Looking for a simple circuit to control the light intensity of Light Emitting Diodes (LEDs) or similar lighting sources? Here is an Arduino based circuit with three independent pulse width modulated ...

and fortunately they are easy to use with our favorite Arduino microcontroller. 8×8 LED Matrix module have many applications in real life, such as various types of electronic display panels. The LED ...

Instead of the relative horror of driving 40 LEDs with a single Arduino ... To actually power and control the entire circuit, [Martyn] used an Arduino loaded up with a program based LedControl ...

So where it was once advantageous to opt for serial connected LED arrays for display backlighting, today the concept of using parallel circuit configurations is a viable alternative.

You could put the Arduino in deep sleep, if you wanted to and that LED will still blink. With a little work, you could probably adapt this idea to any number of circuits out of the 555 playbook ...