Why not build a display with them? We’ve seen a lot of clocks that make use of LED modules but soldering ... An ATmega328 in the form of an Arduino controls the device with the aid of a DS1307 ...

Although it’s an amazing DIY project, we noted that most of the readers are looking for more advanced circuits using multiple seven-segment light emitting diode displays. Here is a simple, yet useful ...

The rows are turned on and off using ten transistors controlled by ten more Arduino pins. Scanning at 80 frames per second he gets a nice, flickerless display. To make both the LED matrix circuit ...