Use Arduino drive MAX72xx 8-digit LED display module

Byamber

Use Arduino drive MAX72xx 8-digit LED display module

OBJECTIVE

In this project, we will use Arduino to MAX7219 matrix LED module. MAX7219 uses SPI serial protocol. It needs only three I/O ports which can save a lot of I/O resources than other Maxtrix LEd module.

Parts and devices：

1 x arduino UNO R3

1 x MAX72xx 8-digit LED display module

1 x USB cable

some jumper wires

3) Circuit graph

4) Download library and sample code from following link

LedControl.zip. Unzip this file and move the unzipped folder to Arduino IDE library sub folder. Open the example file in the library.

Connection:

In above sample code, lc=LedControl(12,11,10,8) defines connection pins, details as following:

In function LedControl(int dataPin, int clkPin, int csPin, int numDevices), first parameter means data pin,

2nd parameter means clock pin, 3rd parameter means enable signal, last parameter means number of matrices(from 1 to 8)

Result

Load the code into Arduino IDE, the matrix will be turn on.

MAX7219 datasheet：MAX7219