Pete writes –
“If you want to build your own multiple RGB LED display that you can control from either a PC or a dedicated controller then this project will let you do just that.
The project on this page came about when while I was developing a more complex intelligent driver. During that work I put together a simple Red/Green/Blue Pulse Width Modulation LED driver that has a serial interface. The RGB values to control the LED brightness are sent to the PWM driver over this serial interface. “ [via] – Link.
Source and schematics included.