Description:

• This module is made up of 4 matrices each of 8 by 8 LEDs.
• Each 8 x 8 matrix has its own MAX7219 driver, creating an 8 x 32 LED dot matrix display.
• The Arduino communicates using serial data, needing just 3 I/O to drive the whole display.

Features:

• Need only three IO port to drive a dot!
• No flicker when the dot matrix is displayed
• Support cascade
• A single module can drive an 8x8 matrix common cathode 16 fixing screw holes, diameter 3mm
• Module with input and output interfaces, support for cascading multiple modules

Parameters:

Connect with Arduino: 

Led Matrix is designed with 5 pins connected to the microcontroller:

• IN: connected to MOSI pin (pin 11) of Arduino, this is the data transmission pin from the microcontroller to Max 7219.
• CLK: connect with SCK pin (pin 13) of Arduino, this is the operating pulse level for Max7219.
• LOAD: connect with any I / O pin on Arduino (choose pin 10), this is the operation option pin.
• Vcc is power supply pin, connected to 5V on the Arduino.
• GND is a Mass level pin, connected to GND on Arduino.

Document: 

Lib+Example