An Arduino library for controlling a canvas of sets of 8x8 LEDs driven by MAX7219 or MAX7221 controllers. Kits sold for below 10 USD.

This is a simplified version of the original Max72xxPanel Arduino library for use at TinkerTech camps, notably a printToDisplay() function within the TT_Max72xx class that easily allows users to print to matrix LEDs

This is a plugin for Adafruit's core graphics library GFX, providing basic graphics primitives (points, lines, circles, characters, etc.). So besides this library, you need to download and install Adafruit_GFX, dated Jul 5th, 2013 or more recent.

Created by Mark Ruys, [email protected], 2013.

Edited by Patrick Neggie [email protected] 2018.

Place the TT_Max72xx and Adafruit_GFX library folders in your <arduinosketchfolder>/libraries/ folder. You may need to create the libraries subfolder if its your first library. Restart the Arduino IDE.

• Double buffering to prevent screen flicker. Check out our example for usage.
• Support for multiple matrix displays, positioned in an arbitrary rectangular layout. You can define both the order as the rotation of each display.
• Uses the SPI library to address the display(s) connected in cascade.
• Low memory footprint.
• Fast, no use of NOOP's.
• Easy usage, one-line function to print text to display

A new function in the format void printToDisplay(String tape, int wait) takes in a two parameters: a string of what to print to the display and a integer wait time to change how fast the text scrolls on the display.

Read overview for instructions how to use Adafruit_GFX. Check out our examples to get some inspiration. Note that to update your displays, you need to explicitely call write().

At YouTube, you'll find a ticker tape and snake demo.