LedControl (LedControl.h)

LedControl - a Arduino library for the MAX7221 and MAX7219 http://playground.arduino.cc/Main/LedControl -- There is already a library and a lot of code-examples for the Arduino and the MAX72XX available, but the focus had always been on controlling Leds layed out in some sort of rectangular matrix. I use the MAX72XX to drive 7-segment displays, so I wanted a function to display numbers (decimal and hexa-decimal) and also the limited set of alphanumeric characters that make (visual) sense on this kind of displays. But the library also provides a basic set of functions by which either individual or groups of Leds can be switched on and off.