MD_MAX72xx LED Matrix Arduino Library 3.4
Library to control connected MAX72XX devices as a pixel array
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Arduino LED Matrix Library

The Maxim 72xx LED Controller IC

The MAX7219/MAX7221 are compact, serial input/output display drivers that interface microprocessors to 7-segment numeric LED displays of up to 8 digits, bar-graph displays, or 64 individual LEDs. Included on-chip are a BCD code-B decoder, multiplex scan circuitry, segment and digit drivers, and an 8x8 static RAM that stores each digit.

A 4-wire serial interface (SPI) allows the devices to be cascaded, with communications passed through the first device in the chain to all others. Individual elements may be addressed and updated without rewriting the entire display.

This library implements functions that allow the MAX72xx to be used for LED matrices (64 individual LEDs), allowing the programmer to use the LED matrix as a pixel device, displaying graphics elements much like any other pixel addressable display.