Take a gander at the Giant LED bar ... transistor ICs controlled by 595 shift registers address them on the low side. From there just use any controller you wish, but in this case it’s an Arduino.

The circuit he came up with is deceptively simple — just four transistors, a Schottky diode, and a bunch of passives. The other clever bit is the data interface between LED bars, which can be ...

Each bar-graph display comprises one red and one blue LED in the same bar (Figure 2). Each LED has its own anode and cathode connections, thereby keeping this circuit simple without the need to add ...